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Master Agreement - Becton, Dickinson and Co. and Nanogen Inc.

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                                MASTER AGREEMENT

                                     between

                          BECTON, DICKINSON AND COMPANY

                                       and

                                  NANOGEN, INC.

                            ------------------------

                           Dated as of October 1, 1997

                            ------------------------

================================================================================

<PAGE>   2

                                TABLE OF CONTENTS
<TABLE>
<CAPTION>

                                                                            Page
                                                                            ----

<S>                                                                           <C>
ARTICLE I THE PARTNERSHIP......................................................3
        1.1    Exclusive Arrangement...........................................3
        1.2    Purpose.........................................................3
        1.3    Partnership Agreement...........................................4

ARTICLE II ANCILLARY AGREEMENTS................................................4
        2.1    Collaborative Research and Development and License Agreement....4
        2.2    Administrative Services.........................................4
        2.3    Future Agreements...............................................5
        2.4    Cooperation................................................... 11
        2.5    Access to Facilities.......................................... 11
        2.6    Right of First Offer.......................................... 11
        2.7    SDA License Outside the Field................................. 13
        2.8    Letter of Intent.............................................. 13
        2.9    Confirmation Under Stock Purchase Agreement................... 13

ARTICLE III REPRESENTATIONS AND WARRANTIES; COVENANTS........................ 14
        3.1    Representations and Warranties of Becton...................... 14
        3.2    Representations and Warranties of Nanogen..................... 15
        3.3    Covenants of Becton and Nanogen............................... 17

ARTICLE IV EFFECTIVE DATE AND DELIVERIES..................................... 18

ARTICLE V DISPUTE RESOLUTION................................................. 18
        5.1    Dispute Resolution............................................ 18
        5.2    Non-binding Mediation......................................... 19
        5.3    Statutes of Limitations....................................... 20
        5.4    Equitable Relief.............................................. 20
        5.5    Expenses of Consultation and Mediation........................ 20

ARTICLE VI TERMINATION....................................................... 21

ARTICLE VII MISCELLANEOUS PROVISIONS......................................... 21
        7.1    Brokers' and Finders' Fees.................................... 21
        7.2    Expenses...................................................... 21
        7.3    Further Assurances............................................ 21
        7.4    Entire Agreement.............................................. 22
        7.5    Assignment and Binding Effect................................. 22
        7.6    Written Amendment; Waiver..................................... 23
        7.7    Notices....................................................... 23
        7.8    Governing Law; Construction................................... 24
        7.9    No Benefit to Others.......................................... 25
</TABLE>

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<PAGE>   3

<TABLE>
<CAPTION>


<S>                                                                           <C>
        7.10   Counterparts.................................................. 25
        7.11   Severability.................................................. 25
        7.12   Relationship of the Parties................................... 25
        7.13   Publicity..................................................... 25


EXHIBITS

        A -    General Partnership Agreement

        B -    Collaborative Research and Development and License Agreement

        C -    Administrative Services Agreements

        D -    SDA License Agreement

        E -    Letter of Intent

        F -    Officer's Certificate

        G -    CPR Procedures

</TABLE>


                                      -ii-



<PAGE>   4



        THIS MASTER AGREEMENT (the "Agreement") is made as of the 1st day of
October, 1997 by and between BECTON, DICKINSON AND COMPANY, a New Jersey
corporation ("Becton"), and NANOGEN, INC., a California corporation ("Nanogen"),
with reference to the following background:

        A. Nanogen has developed certain technology related to electronically
addressable microchip oligonucleotide arrays ("Arrays").

        B. Becton has developed certain technology related to methods for
creating multiple copies of an oligonucleotide sequence known as Strand
Displacement Amplification ("SDA").

        C. On May 5, 1997 Becton and Nanogen entered into (i) a Series D
Preferred Stock Purchase Agreement (the "Stock Purchase Agreement") pursuant to
which Becton acquired an equity interest in Nanogen and agreed to purchase
additional shares of stock of Nanogen upon the occurrence of certain events. In
addition, as of May 5, 1997, Becton and Nanogen entered into a Collaborative
Research and Development Agreement (the "Prior R&D Agreement") to perform
research and development activities with the objective of producing
instrument/reagent systems which utilize Arrays ("Products").

        D. Becton and Nanogen now desire to form through special purpose
entities a partnership to be named The Nanogen/Becton Dickinson Partnership (the
"Partnership") having the business of developing and commercializing worldwide
the Products and such other products as Becton and Nanogen shall agree. The
Partnership's activities with respect to Products shall be limited to the
"Field," which shall mean in vitro nucleic acid-based diagnostic and monitoring
technology involving tests utilizing Arrays for the detection, identification
and/or determination of susceptibility/resistance of microbial agents (i.e.,

                                       -1-




<PAGE>   5



bacteria, viruses, fungi and parasites), excluding, however, ***.
Notwithstanding the foregoing, the Field shall include *** for a period which
concludes on that date which is three and one-half (3 1/2) years following the
date of this Agreement or one (1) year following the first commercial
introduction of a Product in the Field, whichever shall first occur.

        The Partnership, its Partners and their respective Affiliates will:
conduct research and development with respect to the Products solely in the
Field and any other products agreed to by Becton and Nanogen; obtain the
necessary notifications and applications, and amendments and/or supplements
thereto, as required by the Federal Food, Drug and Cosmetic Act, the Public
Health Service Act and the regulations of the U.S. Food and Drug Administration
("FDA") and comparable foreign regulatory authorities with respect to the
Products solely in the Field and any such other products; manufacture the
Products solely in the Field and any such other products after acquisition of
the appropriate approvals and licenses from the FDA and comparable foreign
regulatory authorities, to the extent so required; market and sell the Products
solely in the Field and any such other products worldwide and (5) do any and all
things related or incidental thereto. "Partnership Business" shall mean
collectively the foregoing activities and functions to be performed by the
Partnership, its Partners and their respective Affiliates. "Affiliates" as used
herein shall mean any corporation or other business entity controlled by or in
common control of a party. "Control" as used herein means the ownership directly
or indirectly of fifty percent (50%) or more of the voting stock of a
corporation or fifty percent (50%) or greater interest in the income of such
corporation or other business entity or the ability otherwise of a party to
secure that the affairs of such corporation or other business entity are managed
in accordance with its wishes.

***CONFIDENTIAL MATERIAL REDACTED AND FILED SEPARATELY WITH THE COMMISSION.

                                       -2-





<PAGE>   6



        NOW, THEREFORE, in consideration of the respective covenants,
representations and warranties herein contained, and intending to be legally
bound, the parties agree as follows:

                                    ARTICLE I
                                 THE PARTNERSHIP

        1.1 Exclusive Arrangement. The parties shall cause the Partnership to be
formed by their special purpose entities under the laws of the State of
Delaware, of which Becton Dickinson Venture LLC, a Delaware limited liability
company directly wholly-owned by Becton (the "Becton Partner") and NanoVenture
LLC, a Delaware limited liability company directly wholly-owned by Nanogen (the
"Nanogen Partner"), shall be the general partners (collectively, the
"Partners"). The Partnership Business shall be carried on exclusively by the
Partnership, its Partners and their respective Affiliates. Nothing in this
Agreement or in any Exhibit to this Agreement is intended to create, or may be
construed to create, except as specifically set forth herein or in any agreement
specifically referred to herein, any legal or business relationship between
Becton and Nanogen, including, without limitation, the relationship of principal
and agent or partner, the existence of which is hereby expressly denied by each
party.
       
        1.2 Purpose. The purpose of the Partnership shall be to conduct the
Partnership Business.

        1.3 Partnership Agreement. Concurrently with the execution of this
Agreement, the Partners shall enter into a General Partnership Agreement in the
form attached hereto as Exhibit A (the "Partnership Agreement").

                                       -3-




<PAGE>   7

                                   ARTICLE II
                              ANCILLARY AGREEMENTS

        2.1 Collaborative Research and Development and License Agreement.
Concurrently with the execution of this Agreement, the Partnership shall enter
into a Collaborative Research and Development and License Agreement with Becton
and Nanogen in the form attached hereto as Exhibit B (the "Research and
Development Agreement") to employ Becton and Nanogen to conduct continuing
research and development activities with respect to the Products in the Field.
Neither Becton nor Nanogen has entered into any outstanding options, licenses or
agreements of any kind relating to the Products in the Field other than as
otherwise specified in the Research and Development Agreement.

        2.2 Administrative Services. Concurrently with the execution of this
Agreement, the Partnership shall enter into an Administrative Services Agreement
in the form attached hereto as Exhibit C (the "Administrative Services
Agreement") with Becton. Becton and Nanogen recognize that the Partnership may
in the future require additional administrative services and that, subject to
the terms of the Partnership Agreement, the Partnership shall enter into
additional agreements in substantially the form attached as Exhibit C with
Becton and/or Nanogen to provide such services, shall contract with third
parties for such services or shall undertake to provide those services itself.


        2.3 Future Agreements. Becton and Nanogen recognize that, dependent upon
the results of activities conducted under the Research and Development Agreement
and other factors, the Partnership, Becton and Nanogen will in the future enter
into one or more license agreements, manufacturing/supply agreements and sales,
marketing and distribution agreements in furtherance of the Partnership
Business. Becton and Nanogen have agreed on

                                       -4-





<PAGE>   8



the basic terms of certain of those agreements (the "Basic Terms"), and each of
Becton and Nanogen covenants that it will, and each of Becton and Nanogen
covenants that it will cause the Partnership to, negotiate in good faith
definitive versions of such agreements that reflect the Basic Terms, in no event
later than the date which the Partnership Management Committee (as defined in
the Partnership Agreement) determines is sufficiently in advance of the
commencement of the marketing and manufacturing of Products in the Field. Such
agreements and their Basic Terms are as follows:

        (a) License Agreements. The Partnership shall enter into separate
License Agreements with each of Becton and Nanogen (each, a "License Agreement"
and collectively, the "License Agreements"). The License Agreements shall
provide for the following:

               (i) The Partnership will license to Nanogen or an Affiliate of
        Nanogen all intellectual property rights within the Field necessary for
        Nanogen or any such Nanogen Affiliate to manufacture SDA reagents, other
        reagents, chips/devices, cartridges and probes (collectively the
        "Components") for sale to Becton under the Manufacturing and Supply
        Agreements (as described below). The Partnership will license to Becton
        or an Affiliate of Becton all intellectual property rights within the
        Field necessary for Becton or any such Becton Affiliate to (A)
        manufacture instruments ("Instruments") to be used with the Components
        to be supplied to Becton by Nanogen under the Manufacturing and Supply
        Agreements, (B) sell such Components and sell or provide for the use of
        Instruments to third parties in the United States, and (C) to sell such
        Components and sell or provide for the use of Instruments to

                                       -5-



<PAGE>   9



        foreign Affiliates of Becton for sale of such Components and sale or the
        provision of the use of such Instruments by such Becton foreign
        Affiliates to third parties in markets outside of the United States. The
        royalties payable by Nanogen or its Affiliate and Becton or its
        Affiliate to the Partnership under their respective License Agreements
        shall be determined on an arm's length basis.

               (ii) In order to support the commencement of and successful
        manufacturing of the Components and the Instruments for each fiscal year
        of the Partnership ("Partnership Fiscal Year"), the Partnership will pay
        to each party and/or such Affiliates of such party as such party directs
        as promptly as possible after the end of each Partnership Fiscal Year a
        manufacturing start-up allowance equal to the amount expended by such
        party and/or its Affiliates pursuant to the budget agreed to in
        accordance with Section 7.2(1) of the Partnership Agreement for such
        Partnership Fiscal Year for Component manufacturing start-up ("Component
        Manufacturing Start-Up Allowance") and Instrument manufacturing start-up
        ("Instrument Manufacturing Start-Up Allowance").

               (iii) In order to support the commencement of successful
        marketing, sale and distribution of the Components and sale or provision
        of the use of Instruments, for each Partnership Fiscal Year the
        Partnership will pay to Becton and/or such Affiliates of Becton as
        Becton directs as promptly as possible after the end of each Partnership
        Fiscal Year a promotional and marketing allowance equal to the amount
        expended by Becton and/or its

                                       -6-




<PAGE>   10



        Affiliates pursuant to the budget agreed to in accordance with section
        7.2(1) of the Partnership Agreement for such Partnership Fiscal Year for
        marketing, selling and distributing Components and Instruments and the
        costs of providing for the use of Instruments ("Marketing Allowance").

               (iv) The allowances provided for in Sections 2.3(a)(ii) and (iii)
        shall be paid by the Partnership for each Partnership Fiscal Year unless
        the Partnership Business generates Net Cash Flow for such Partnership
        Fiscal Year. Notwithstanding the foregoing provisions of this Section
        2.3(a)(iv), the Partnership shall in all events pay the following
        minimum allowances to Becton which Becton and/or its Affiliates shall
        expend on the promotion, marketing, sale and distribution of Components
        and sale or provision of the use of Instruments on behalf of the
        Partnership's Business: (x) *** for the Partnership's first amplified
        Product in the Field, (y) *** for the Partnership's first non-amplified
        Product in the Field and (z) *** for the Partnership's first Product for
        testing antibiotic resistance in the Field. For purposes of this Section
        2.3(a)(iv), "Net Cash Flow" for a Partnership Fiscal Year shall mean the
        excess, if any, of (A) total cash receipts of the Partnership Business
        for such Partnership Fiscal Year, exclusive of contributions made to the
        Partnership in such Partnership Fiscal Year, over (B) total cash
        disbursements of the Partnership Business for such Partnership Fiscal
        Year, exclusive of the sum of any Component Manufacturing Start-Up
        Allowance, Instrument Manufacturing Start-Up Allowance and Marketing
        Allowance paid by the Partnership in such Partnership Fiscal Year.



***CONFIDENTIAL MATERIAL REDACTED AND FILED SEPARATELY WITH THE COMMISSION.


                                           -7-





<PAGE>   11



        (b) Funding of Allowances.

               (i) The Becton Partner shall contribute to the Partnership as
        provided in Section 8.1(a)(v) of the Partnership Agreement to fund the
        Instrument Manufacturing Start-Up Allowance, and the Nanogen Partner
        shall contribute to the Partnership as provided in Section 8.1(b)(v) of
        the Partnership Agreement to fund the Component Manufacturing Start-Up
        Allowance, to be paid to Becton or Nanogen, as the case may be, by the
        Partnership pursuant to the applicable License Agreement. Such
        contributions shall be consistent with each such allowance.

               (ii) The Becton Partner shall contribute to the Partnership as
        provided in Section 8.1(a)(v) of the Partnership Agreement to fund the
        promotional and marketing allowance to be paid to Becton by the
        Partnership pursuant to the License Agreement between the Partnership
        and Becton. Such contributions by the Becton Partner shall be consistent
        with the Marketing Allowance and in all events shall be in the following
        minimum amounts: (x) *** for the Partnership's first amplified Product
        in the Field, (y) *** for the Partnership's first non-amplified Product
        in the Field and (z) *** for the Partnership's first Product for testing
        antibiotic resistance in the Field.

        (c) Manufacturing and Supply Agreements. Nanogen and Becton shall enter
into Manufacturing and Supply Agreements for, respectively, the United States
and outside of the United States (collectively, the "Manufacturing and Supply
Agreements"). The Manufacturing and Supply Agreements shall provide for the
following:



***CONFIDENTIAL MATERIAL REDACTED AND FILED SEPARATELY WITH THE COMMISSION.


                                      -8-


<PAGE>   12



               (i) Nanogen shall supply Components to Becton for sale by Becton
        to third parties in the United States, and for sale by Becton to its
        Affiliates for sale to third parties outside the United States. The
        prices at which, or procedures for determining the prices at which,
        Components are to be supplied to Becton under the Manufacturing and
        Supply Agreement for the United States shall be established in said
        Manufacturing and Supply Agreement in such manner that as a result of
        such pricing, the applicable Profit or Loss (as defined in Section
        2.3(c)(ii)) relating to the United States market is shared 50% by
        Nanogen and 50% by Becton. In the case of the sale of Components and the
        sale or provision of use of Instruments by Becton Affiliates outside the
        United States, the Profit or Loss relating to foreign markets also shall
        be shared 50% by Nanogen and 50% by Becton, and such sharing shall be
        achieved by (A) the pricing of Components to Becton under the
        Manufacturing and Supply Agreement for outside the United States, (B)
        special allocations of Partnership profit, loss, distributions and
        contributions or (C) combinations of such pricing and Partnership
        allocations, as agreed by Becton and Nanogen as part of the negotiation
        of such Manufacturing and Supply Agreement. Becton shall consult in good
        faith with Nanogen regarding the prices and amounts of any royalties to
        be charged by Becton to its Affiliates for sales of Components and sale
        or provision of the use of Instruments *** and the terms of any sales
        and any license agreements between Becton and its Affiliates relating to
        such sales of Components or sale or provision of the use of such
        Instruments; provided,


***CONFIDENTIAL MATERIAL REDACTED AND FILED SEPARATELY WITH THE COMMISSION.


  
                                       -9-




<PAGE>   13



        however, that ***, under the Manufacturing and Supply Agreement for ***,
        to determine such prices, royalties and terms.

               (ii) Under the Manufacturing and Supply Agreements, the
        applicable Profit or Loss shall be computed quarterly and any
        adjustments to such prices needed to, and payments to be made to,
        achieve such sharing of such quarterly applicable Profit or Loss shall
        be made promptly after the end of each such fiscal quarter. The
        Manufacturing and Supply Agreements each shall define the applicable
        "Profit or Loss" in detail and in a manner consistent with the general
        principle that applicable Profit or Loss in each case shall be the sum
        of (A) the pre-tax net profit earned or loss incurred by Nanogen on the
        manufacture and sale of Components to Becton under the applicable
        Manufacturing and Supply Agreement, determined after deduction of
        royalties payable by Nanogen or its Affiliates under its License
        Agreement, (B) the pre-tax net profit earned or loss incurred by Becton
        on the manufacture of Instruments and the sale or provision of the use
        of Instruments and the sale of Components to third parties in the United
        States and to Becton's foreign Affiliates for markets outside the United
        States, determined after deduction of royalties payable by Becton or its
        Affiliates under its License Agreement; and (C) only in the case of
        sales of Components and sale or provision of use of Instruments by
        Becton Affiliates outside the United States to third parties outside the
        United States, the pre-tax net profit earned or loss incurred by such
        Becton foreign Affiliates on such sale or provision of the use of
        Instruments and such sale of Components, determined


***CONFIDENTIAL MATERIAL REDACTED AND FILED SEPARATELY WITH THE COMMISSION.



                                      -10-




<PAGE>   14



        after deduction of any royalties payable by any such Becton Affiliates
        in connection therewith.

        (d) Scope of Activities. The activities of Becton, Nanogen and their
respective Affiliates pursuant to the Manufacturing and Supply Agreements
described in this Section 2.3 shall be undertaken exclusively within the Field.

        2.4 Cooperation. Subject to the terms of the Partnership Agreement,
Becton and Nanogen agree to cause the Becton Partner and the Nanogen Partner,
respectively, to do, all other reasonable acts or things helpful, necessary or
appropriate to maximize the success of the Partnership Business through the
development and commercial exploitation of Products and any other products
agreed to by Becton and Nanogen.

        2.5 Access to Facilities. Each of Becton and Nanogen shall be granted
the right, upon reasonable prior notice, to visit the other party's facilities
twice each year during the term of the Partnership for orientation on all
research and development and manufacturing and marketing activities.





                                      -11-





<PAGE>   15



        2.6    Right of First Offer.

               (a) Nanogen hereby grants to the Becton Partner, acting on behalf
of and for the benefit of the Partnership, rights of first offer to negotiate
licenses to the Partnership in the following fields:

                      (i)    ***

                      (ii)   ***

        Upon agreement regarding license terms for one or both of the foregoing
fields, an appropriate change to the definition of "Field" in this Agreement,
the Partnership Agreement and the Research and Development Agreement and
appropriate amendments to incorporate agreed upon license terms shall be made.

        (b) The Becton Partner's rights of first offer on behalf of the
Partnership shall be governed by the following procedures.

               (i) If during the term of this Agreement Nanogen determines to
offer unrelated third parties a license in either field described in
subparagraph (a) on commercially reasonable terms, Nanogen shall first, prior to
taking any other action with respect to any such third parties, notify the
Becton Partner in writing of its intention to license same. Such written notice
shall include a reasonably detailed description of the proposed field and the
material terms and conditions of such license, including proposed royalty rates
and other financial and commercial terms. Within *** following the Becton
Partner's receipt of such notice, the Becton Partner shall give written notice
to Nanogen of its intention to negotiate such a license on behalf of the
Partnership (the "Notice of Intention"), provided, however, that the Becton
Partner shall not be entitled to negotiate a license for the field of *** unless
Becton or one of its at least 50 percent-owned affiliates is



***CONFIDENTIAL MATERIAL REDACTED AND FILED SEPARATELY WITH THE COMMISSION.



                                      -12-





<PAGE>   16



then engaged in that business with annual sales revenues in the relevant field
equal to at least ***.

               (ii) Following Nanogen's receipt of such a Notice of Intention
from the Becton Partner, the parties shall negotiate in good faith to conclude a
definitive license agreement between the Partnership and Nanogen with respect to
such field. The Becton Partner's negotiating rights with Nanogen shall be
exclusive for a period of ***, subject to earlier termination in the Becton
Partner's discretion.

               (iii) If the parties are unable to negotiate a license during the
exclusive negotiating period, thereafter Nanogen in its discretion may negotiate
a license in such field with a third party on terms no less favorable to Nanogen
than those last offered to the Becton Partner on behalf of the Partnership.

        2.7 SDA License Outside the Field. Concurrently with the execution of
this Agreement, Becton and Nanogen shall enter into the SDA License Agreement in
the form attached hereto as Exhibit D (the "SDA License Agreement").

        2.8 Letter of Intent. Concurrently with the execution of this Agreement,
Becton and Nanogen shall enter into a letter of intent in the form attached
hereto as Exhibit E (the "Letter of Intent") relating to the acquisition by the
Partnership of the assets of *** and of certain intellectual property rights of
***, and related transactions between Becton, Nanogen and the Partnership.

        2.9 Confirmation Under Stock Purchase Agreement. Becton and Nanogen
hereby agree and confirm that the Partnership Agreement constitutes a
"partnership or joint venture agreement" as contemplated by the second sentence
of Section 1.3a of the Stock Purchase Agreement which shall remain in full force
and effect.


***CONFIDENTIAL MATERIAL REDACTED AND FILED SEPARATELY WITH THE COMMISSION.



                                      -13-





<PAGE>   17




                                         ARTICLE III
                          REPRESENTATIONS AND WARRANTIES; COVENANTS

        3.1 Representations and Warranties of Becton. Becton represents and
warrants as of the Effective Date that:

        (a) Organization, Power and Standing. Becton is a corporation duly
organized, validly existing and in good standing under the laws of the State of
New Jersey, and the Becton Partner is a limited liability company duly
organized, validly existing and in good standing under the laws of the State of
Delaware. Becton has all necessary corporate power and authority, and the Becton
Partner has all necessary power and authority, to own their respective
properties and to carry on their respective business as now owned and operated
by them.

        (b) Authority. Becton has full corporate power and authority to execute
and deliver this Agreement and the Research and Development Agreement, the
Administrative Services Agreement, the SDA License Agreement and the Letter of
Intent (collectively, the "Becton Ancillary Agreements") and to consummate and
perform the transactions contemplated hereby and thereby. The Becton Partner has
full power and authority to execute and deliver the Partnership Agreement and to
consummate and perform the transactions contemplated thereby. The execution and
delivery of this Agreement and the Becton Ancillary Agreements by Becton and the
consummation and performance by Becton of the transactions contemplated hereby
and thereby have been, and the execution and delivery of the Partnership
Agreement by the Becton Partner and the consummation and performance by the
Becton Partner of the transactions contemplated thereby have been, duly and
validly authorized by all necessary corporate or limited liability company
proceedings,





                                      -14-





<PAGE>   18



as applicable; and this Agreement, the Becton Ancillary Agreements and the
Partnership Agreement shall, when executed and delivered on behalf of Becton and
the Becton Partner, as applicable, constitute the valid obligations of Becton
and the Becton Partner, as applicable, and be legally binding upon them in
accordance with their respective terms.

        (c) Compliance. No approval or consent of any federal, state, county,
local or other governmental agency or body is required in connection with the
execution, delivery, consummation and performance by Becton of this Agreement or
the Becton Ancillary Agreements or by the Becton Partner of the Partnership
Agreement. The execution, delivery, consummation and performance by Becton of
this Agreement and the Becton Ancillary Agreements, and the execution, delivery,
consummation and performance by the Becton Partner of the Partnership Agreement,
will not conflict with or result in the breach or violation of any term or
provision of, or constitute a default under, the Certificate of Incorporation or
By-Laws of Becton or the operating agreement of the Becton Partner,
respectively, and will not conflict with or result in the breach or violation of
any material term or provision of, or constitute a material default under, any
statute, indenture, mortgage, deed of trust, note agreement or other agreement
or instrument to which Becton or the Becton Partner is a party or by which
Becton or the Becton Partner is bound, or any law, order, writ, injunction,
decree, rule or regulation of any court or any governmental agency or body.

        3.2 Representations and Warranties of Nanogen. Nanogen represents and
warrants as of the Effective Date that:

        (a) Organization, Power and Standing. Nanogen is a corporation duly
organized, validly existing and in good standing under the laws of the State of
California, and the

                                      -15-






<PAGE>   19



Nanogen Partner is a limited liability company duly organized, validly existing
and in good standing under the laws of the State of Delaware. Nanogen has all
necessary corporate power and authority, and the Nanogen Partner has all
necessary power and authority, to own their respective properties and to carry
on their respective business as now owned and operated by them.

        (b) Authority. Nanogen has full corporate power and authority to execute
and deliver this Agreement and the Research and Development Agreement, the SDA
License Agreement and the Letter of Intent (collectively, the "Nanogen Ancillary
Agreements") and to consummate and perform the transactions contemplated hereby.
The Nanogen Partner will have full power and authority to execute and deliver
the Partnership Agreement and to consummate and perform the transactions
contemplated thereby. The execution and delivery of this Agreement and the
Nanogen Ancillary Agreements by Nanogen and the consummation and performance by
Nanogen of the transactions contemplated hereby and thereby have been, and the
execution and delivery of the Partnership Agreement by the Nanogen Partner and
the consummation and performance by the Nanogen Partner of the transactions
contemplated thereby have been, duly and validly authorized by all necessary
corporate proceedings; and this Agreement, the Nanogen Ancillary Agreements and
the Partnership Agreement shall, when executed and delivered on behalf of
Nanogen and the Nanogen Partner, as applicable, constitute the valid obligations
of Nanogen and the Nanogen Partner, as applicable, and be legally binding upon
them in accordance with their respective terms.

        (c) Compliance. No approval or consent of any federal, state, county,
local or other governmental agency or body or any individual, corporation or
other entity is required

                                      -16-





<PAGE>   20



in connection with the execution, delivery, consummation and performance by
Nanogen of this Agreement or the Nanogen Ancillary Agreements or by the Nanogen
Partner of the Partnership Agreement. The execution, delivery, consummation and
performance by Nanogen of this Agreement and the Nanogen Ancillary Agreements,
and the execution, delivery, consummation and performance by the Nanogen Partner
of the Partnership Agreement, will not conflict with or result in the breach or
violation of any term or provision of, or constitute a default under, the
Articles of Incorporation or By-Laws of Nanogen or the operating agreement of
the Nanogen Partner, respectively, and will not conflict with or result in the
breach or violation of any material term or provision of, or constitute a
material default under, any statute, indenture, mortgage, deed of trust, note
agreement or other agreement or instrument to which Nanogen or the Nanogen
Partner is a party or by which Nanogen or the Nanogen Partner is bound, or any
law, order, writ, injunction, decree, rule or regulation of any court or any
governmental agency or body.

        3.3 Covenants of Becton and Nanogen. (a) Becton covenants to Nanogen
that Becton will ensure that, at all times during the term of the Partnership,
(i) the Becton Partner will have solely one member and (ii) no election to treat
the Becton Partner as a corporation for United States federal income tax
purposes will be made under section 301.7701-3 of the Income Tax Regulations or
any successor regulation; provided, however, beginning after the ***
of the formation of the Partnership, Becton may cause an increase in the
members of the Becton Partner or make such an election to treat the Becton
Partner as a corporation if Becton obtains the prior written consent of Nanogen.

        (b) Nanogen covenants to Becton that Nanogen will ensure that, at all
times during the term of the Partnership, (i) the Nanogen Partner will have
solely one member and





                                      -17-

*** CONFIDENTIAL MATERIAL REDACTED AND FILED SEPARATELY WITH THE COMMISSION.





<PAGE>   21



(ii) no election to treat the Nanogen Partner as a corporation for United States
federal income tax purposes will be made under section 301.7701-3 of the Income
Tax Regulations or any successor regulation; provided, however, beginning after
the *** of the formation of the Partnership, Nanogen may cause an increase in
the members of the Nanogen Partner or make such an election to treat the Nanogen
Partner as a corporation if Nanogen obtains the prior written consent of Becton.

        (c) Each of Becton and Nanogen covenants that it will comply with, and
be bound by, the provisions of Section 7.2 of the Partnership Agreement
regarding Major Decisions (as defined therein) pertaining to the Partnership
Business.

                                   ARTICLE IV
                          EFFECTIVE DATE AND DELIVERIES

        4.1 This Agreement, the Research and Development Agreement, the
Partnership Agreement, the SDA License Agreement, the Letter of Intent and the
Administrative Services Agreement shall be executed and delivered by the
respective parties to each other party as of, and shall each have an effective
date of, October 1, 1997. Each party (other than the Partnership) shall deliver
to each other party an officer's certificate in the form of Exhibit F attached
hereto.

                                    ARTICLE V
                               DISPUTE RESOLUTION

        5.1 Dispute Resolution. Except as otherwise expressly set forth in this
Agreement or the Partnership Agreement, the parties shall attempt in good faith
to resolve

                                      -18-

*** CONFIDENTIAL MATERIAL REDACTED AND FILED SEPARATELY WITH THE COMMISSION.




<PAGE>   22



any disputes, controversies or claims arising out of or related to (i) this
Agreement, (ii) the Partnership Agreement, (iii) the Research and Development
Agreement, (iv) the SDA License Agreement, (v) the Administrative Services
Agreement, (vi) the Letter of Intent and (vii) any other agreement subsequently
entered into between or among them and the Becton Partner and the Nanogen
Partner, including but not limited to any claim of breach, termination or
invalidity, promptly by negotiations between the Chief Executive Officer of
Nanogen and the President of Becton Dickinson Microbiology Systems or other
executives of the parties who have authority to settle the dispute. Either party
may give the other party written notice of any dispute not resolved in the
normal course of business. Within twenty (20) days after delivery of such
notice, executives of both parties shall discuss by telephone or meet at a
mutually acceptable time and place, and thereafter as often as they reasonably
deem necessary, to exchange relevant information and to attempt to resolve the
dispute. If the matter has not been resolved within forty (40) days of the
disputing party's notice, the matter shall be referred to the Board of Directors
of Nanogen and to such executive officer of Becton knowledgeable of the subject
matter thereof as the Chief Executive Officer of Becton in his or discretion
shall nominate for further consideration in an attempt to resolve the matter. If
a negotiator intends to be accompanied at a meeting by an attorney, the other
negotiator shall be given at least three (3) working days' notice of such
intention and may also be accompanied by an attorney. All negotiations pursuant
to this Section 5.1 and pursuant to Section 5.2 are confidential and shall be
treated as compromise and settlement negotiations for purposes of the Federal
Rules of Evidence and state rules of evidence.

        5.2 Non-binding Mediation. If a matter has not been resolved under the
procedures set forth in Section 5.2 above within sixty (60) days of the
disputing party's

                                      -19-





<PAGE>   23



notice, or if the parties fail to discuss or meet within twenty (20) days, then
within ten (10) days thereafter, either party may, but shall not be obligated
to, initiate nonbinding mediation of the controversy or claim under the Center
for Public Resources Model ADR Procedures for Mediation of Business Disputes
attached hereto as Exhibit G (the "CPR Procedures"). Once the mediation is
initiated by one party, the other party agrees to participate in and conduct
mediation in accordance with the CPR Procedures in good faith and not to pursue
other remedies while such mediation is proceeding. If neither party initiates
mediation within the ten (10) day period, or if the dispute has not been
resolved by such mediation within sixty (60) days following initiation of
mediation, either party may pursue all available remedies.

        5.3 Statutes of Limitations. All applicable statutes of limitations and
defenses based upon the passage of time shall be tolled while the negotiation
and mediation procedures set forth in Sections 5.1 and 5.2 are pending. The
parties will take such action, if any, as may be reasonably be required to
effectuate such tolling.

        5.4 Equitable Relief. Notwithstanding the foregoing, the remedy at law
for any breach of the provisions of this Agreement or such other agreements may
be inadequate, and, accordingly, an aggrieved party seeking equitable relief or
remedies for such a breach shall have the right and is hereby granted the
privilege, in addition to all other remedies at law or in equity, to proceed
directly in a court of competent jurisdiction to seek temporary or preliminary
equitable relief.

        5.5 Expenses of Consultation and Mediation. Each party shall pay its own
costs incurred in attempting to resolve a dispute pursuant to the consultation
and mediation

                                      -20-





<PAGE>   24



procedures set forth in Sections 5.1 and 5.2 without the right to recover such
costs from the other party and shall share equally the cost of mediation.

                                   ARTICLE VI
                                   TERMINATION

        6.1 This Agreement shall terminate conterminously with the dissolution
of the Partnership, except that the provisions of Article V shall survive.

                                   ARTICLE VII
                            MISCELLANEOUS PROVISIONS

        7.1 Brokers' and Finders' Fees. Each of the parties represents and
warrants to the other party that all negotiations relative to this Agreement
have been carried on by it directly without the intervention of any person,
firm, corporation or entity who or which may be entitled to any brokerage fee,
finders' fee or other commission in respect of the execution of this Agreement
or the consummation of the transactions contemplated hereby, and such party
shall indemnify, defend and hold the other party harmless against any and all
claims, losses, liabilities or expenses which may be asserted against the other
party or any affiliate thereof as a result of such party's or any of its
affiliates' dealings, arrangements or agreements with any such person, firm,
corporation or entity.

        7.2 Expenses. Each party to this Agreement shall be responsible for the
fees and expenses incurred by it incidental to the consummation of the
transactions contemplated by this Agreement (including, without limitation, fees
and disbursements of its attorneys and accountants in connection with their
respective services on behalf of each party).

                                      -21-





<PAGE>   25



        7.3 Further Assurances. Subject to the terms and conditions herein
provided, each of the parties shall take, or cause to be taken, such action to
execute and deliver, or cause to be executed and delivered, such additional
documents and instruments and to do, or cause to be done, all things necessary,
proper or advisable under the provisions of this Agreement and under applicable
laws to consummate and make effective the transactions contemplated by this
Agreement.

        7.4 Entire Agreement. This Agreement, the Partnership Agreement, the
Research and Development Agreement, the Administrative Services Agreement, the
Confidentiality Agreement (as such term is defined in the Partnership
Agreement), the SDA License Agreement and the Letter of Intent set forth the
entire understanding of the parties with respect to the subject matter hereof
and supersede and replace all prior agreements, understandings, writings and
discussions between the parties relating to said subject matter. Any and all
previous agreements and understandings between the parties regarding the subject
matter hereof, whether written or oral, including, without limitation, the Prior
Research and Development Agreement, are superseded by this Agreement. In the
event of any conflict between any term or provision of this Agreement and any of
the foregoing agreements, this Agreement shall control. Nothing contained in
this Agreement shall operate to contravene, amend or modify any term or
provision of the Stock Purchase Agreement, which remains in full force and
effect. The representations and warranties contained in this Agreement shall
survive the execution hereof.

        7.5 Assignment and Binding Effect. This Agreement shall not be
assignable by Becton or Nanogen, nor shall any obligations hereunder be
delegated to a third party, without the other party's prior written consent,
which consent shall not be unreasonably

                                      -22-





<PAGE>   26



withheld or delayed. In the event that Becton or Nanogen, as the case may be,
does not respond to a request from the other for consent to an assignment or
delegation within fifteen (15) days following written notice requesting such
consent, such consent shall be deemed to be granted. In addition, a condition to
any assignment or delegation hereunder shall be that the successor in interest
expressly agrees in writing to assume the assigning or delegating party's
obligations hereunder. All of the terms and provisions of this Agreement shall
be binding upon and inure to the benefit of and be enforceable by the respective
permitted successors and assigns of the parties. No such assignment shall
release the assigning party from its obligations hereunder. Notwithstanding the
foregoing, the consent of either party shall not be required in connection with
a merger involving the other party or with respect to an assignment of this
Agreement in connection with the acquisition, sale of all or substantially all
of the assets of the other party, change of control or similar transaction.

        7.6 Written Amendment; Waiver. This Agreement may be amended only by a
written instrument executed by the parties hereto. The failure of any party at
any time or times to require performance of any provision hereof shall in no
manner affect its rights at a later time to enforce the same. No waiver by any
party of any condition or term in any one or more instances shall be construed
as a further or continuing waiver of such condition or term or any other
condition or term.

        7.7 Notices. Any notice, request, demand, waiver, consent, approval, or
other communication which is required or permitted hereunder shall be in writing
and shall be deemed given only if delivered personally, by facsimile (upon
receipt of appropriate written confirmation) or sent by registered or certified
mail, return receipt requested, or by overnight courier service, postage prepaid
as follows:

                                      -23-





<PAGE>   27



        If to Becton or the Becton Partner, to:

        Becton Dickinson Microbiology Systems
        7 Loveton Circle
        Sparks, MD 21152
        Attention: President

        With required copies to:

        Becton, Dickinson and Company
        1 Becton Drive
        Franklin Lakes, NJ 07417-1880
        Attention:  General Counsel

        If to Nanogen or the Nanogen Partner, to:

        Nanogen, Inc.
        10398 Pacific Center Court
        San Diego, CA 92121
        Attention:  Chief Executive Officer

        With required copies to:

        Nanogen, Inc.
        10398 Pacific Center Court
        San Diego, CA 92121
        Attention:  General Counsel

or to such other address as the addressee may have specified in a notice duly
given to the sender as provided herein. Such notice, request, demand, waiver,
consent, approval or other communication will be deemed to have been given as of
the date so received (in case of personal delivery or overnight courier
delivery) or upon refusal to accept delivery of same.

        7.8 Governing Law; Construction. This Agreement and all agreements
attached hereto as Exhibits shall be governed by and construed in accordance
with the laws of the State of Delaware without regard to its choice of laws
principles, unless any agreement attached hereto as an exhibit shall otherwise
specifically provide. This Agreement shall be construed and interpreted without
application of any principle or rule to the effect that

                                      -24-





<PAGE>   28



ambiguities are to be construed against the party responsible for drafting the
agreement. The headings contained herein are for reference purposes only and
shall not in any way affect the meaning of this Agreement.

        7.9 No Benefit to Others. The terms and provisions contained in this
Agreement are for the sole benefit of the parties and their successors and
assigns, and they shall not be construed as conferring and are not intended to
confer any rights on any other persons.

        7.10 Counterparts. This Agreement may be executed in any number of
counterparts, each of which shall be deemed an original, but all of which
together shall constitute one instrument.

        7.11 Severability. If any provision(s) of this Agreement are or become
invalid, or are ruled illegal by any court of competent jurisdiction, or are
deemed unenforceable under then current applicable law from time to time in
effect during the term hereof, it is the intention of the parties hereto that
the remainder of this Agreement shall not be affected thereby. It is further the
intention of the parties that in lieu of each such provision which is invalid,
illegal, or unenforceable, there be substituted or added as part of this
Agreement, a provision which shall be as similar as possible in economic and
business objectives as intended by the parties to such invalid, illegal, or
unenforceable provision, but which shall be valid, legal, and enforceable, and
shall be mutually agreed by the parties.

        7.12 Relationship of the Parties. Nothing contained in this Agreement
shall be deemed to create a partnership between Becton and Nanogen except as set
forth in the Partnership Agreement. No party shall be liable for the act of any
other party unless such act is expressly authorized in writing by all of the
parties hereto.

                                      -25-




<PAGE>   29



        7.13 Publicity. No press release or announcement concerning the terms of
this Agreement or the transactions contemplated hereby shall be issued by any
party without the prior consent of the other party, which shall not be
unreasonably withheld, except as such release or announcement may be required by
law, rule or regulation (including applicable federal and state securities laws,
rules and regulations) or legal process, provided that in each case the party
making the release or announcement shall allow the other party reasonable time
to comment on such release or announcement in advance of such issuance.

        IN WITNESS WHEREOF, the parties hereto, intending to be legally bound
hereby, have duly executed this Agreement as of the day and year first written
above.


                                     BECTON, DICKINSON AND COMPANY


                                    By  /s/ Vincent A. Forlenza
                                        ----------------------------------------
                                        Vincent A. Forlenza
                                        President - Worldwide
                                        Microbiology Systems



                                    NANOGEN, INC.


                                    By  /s/ Howard C. Birndorf
                                        ----------------------------------------
                                        Howard C. Birndorf
                                        Chairman and Chief Executive Officer

                                      -26-





<PAGE>   30



                                    EXHIBIT A

                          GENERAL PARTNERSHIP AGREEMENT

        THIS GENERAL PARTNERSHIP AGREEMENT (the "Agreement") is entered into as
of the 1st day of October, 1997, by and between Becton Dickinson Venture LLC, a
Delaware limited liability company (the "Becton Partner"), and NanoVenture LLC,
a Delaware limited liability company (the "Nanogen Partner"). The Becton Partner
and the Nanogen Partner are hereinafter collectively referred to as the
"Partners."

                              W I T N E S S E T H:

        WHEREAS, the parties hereto desire to form a general partnership (the
"Partnership") under the laws of the State of Delaware for the purposes and on
the terms provided herein;

        NOW, THEREFORE, in consideration of the mutual covenants herein
expressed, the parties hereto, intending to be legally bound hereby, agree as
follows:

        1. Definitions. All capitalized terms used herein and not otherwise
defined herein shall have the meaning assigned to them in the Research Agreement
(defined below). Unless the context clearly indicates otherwise, the following
terms shall have the meanings set forth below:

        "Affiliate" shall mean any corporation or other business entity
controlled by or in common control of a party. "Control" as used herein means
the ownership directly or indirectly of fifty percent (50%) or more of the
voting stock of a corporation or a fifty percent (50%) or greater interest in
the income of such corporation or other business entity or the ability otherwise
of a party to secure that the affairs of such corporation or other business
entity are managed in accordance with its wishes.

        "Assumed Tax Rate" means for a taxable year the sum of (a) the highest
marginal federal income tax rate applicable to corporations for such taxable
year plus (b) the result of multiplying (i) the highest marginal California tax
rate for corporations by (ii) the percentage calculated by subtracting the
highest marginal federal income tax rate for such taxable year from one hundred
percent. The Assumed Tax Rate shall be determined with respect to each taxable
year by the Tax Matters Partner with the approval of the other Partners.

        "Becton" means Becton, Dickinson and Company, a New Jersey corporation.

        "Becton Partner Unrecovered Cash Contributions" shall mean as of any
date the excess of (a) the sum of the amount set forth in Section 8.1(a)(i) and
the amounts contributed by the Becton Partner under Sections 8.1(a)(iii), (iv)
and (v) as of such date over (b) the cumulative amount of Partnership Business
Cash received by Becton, the Becton Partner and any Affiliate of Becton prior to
such date.



                                       -1-



<PAGE>   31



        "Becton Partner Excess Unrecovered Cash Contributions" shall mean the
amount, if any, by which any Becton Partner Unrecovered Cash Contributions
exceed the amount of any Nanogen Partner Unrecovered Cash Contributions.

        "Becton Intellectual Property License" shall mean the license set forth
in Section 6.1(a) of the Research Agreement.

        "Capital Account" means, with respect to each Partner, an account
determined in accordance with the provisions of Section 8.3.

        "Code" means the Internal Revenue Code of 1986, as in effect as of the
date hereof and as amended.

        "Components" shall have the meaning ascribed to such term in Section 2.3
of the Master Agreement.

        "Confidentiality Agreement" means the Confidentiality Agreement entered
into by Becton and Nanogen effective as of February 6, 1997 as amended.

        "FDA" means the U.S. Food and Drug Administration.

        "Field" shall have the meaning ascribed to such term in the Research
Agreement.

        "Master Agreement" means the Master Agreement entered into by Becton and
Nanogen concurrently with the execution of this Agreement.

        "Nanogen" means Nanogen, Inc., a California corporation.

        "Nanogen Intellectual Property License" shall mean the license set forth
in Section 6.1(b) of the Research Agreement.

        "Nanogen Partner Unrecovered Cash Contributions" shall mean as of any
date the excess of (a) the amounts contributed by the Nanogen Partner under
Sections 8.1(b)(iii), (iv) and (v) as of such date over (b) the cumulative
amount of Partnership Business Cash received by Nanogen, the Nanogen Partner and
any Affiliate of Nanogen prior to such date.

        "Net Cash Flow" shall have the meaning ascribed to it in Section 2.3 of
the Master Agreement.

        "Net Tax Income" shall mean the excess, if any, of the items of income
and gain for each taxable year over the items of deduction, loss and credit
(grossed up at the Assumed Tax Rate for each taxable year to a deduction
equivalent) for each taxable year as shown on the federal


                                       -2-



<PAGE>   32



income tax returns of the Partnership for each taxable year, except that in the
case of property contributed to the capital of the Partnership, items of income,
gain, deduction and loss shall be computed as if the tax basis of such property
at the time of such contribution were equal to its fair market value at such
time.

        "Partnership Business" shall have the meaning ascribed to such term in
the Master Agreement.

        "Partnership Business Cash" shall mean the aggregate Net Cash Flow
derived from the Partnership Business by the Becton Partner and Becton and its
Affiliates, the Nanogen Partner and Nanogen and its Affiliates and the
Partnership.

        "Partnership Interest" means the entire ownership interest of a Partner
in the Partnership at any particular time including, without limitation, the
right of such Partner to participate in the Partnership's profits and losses,
Net Cash Flow, distributions on liquidation of the Partnership and any and all
benefits to which a Partner may be entitled as provided in this Agreement,
together with the obligation of such Partner to comply with all the terms and
provisions of this Agreement.

        "Percentage Interest" means as to the Becton Partner, fifty percent, and
as to the Nanogen Partner, fifty percent.

        "Person" means an individual, partnership, corporation, association,
joint venture, trust, government or political subdivision thereof, governmental
agency or other entity.

        "Prior Research Agreement" means the Collaborative Research and
Development Agreement entered into by Becton and Nanogen as of May 5, 1997,
which is being terminated by the Research Agreement.

        "Product" shall have the meaning ascribed to such term in the Research
Agreement.

        "Program Inventions" shall have the meaning ascribed to such term in the
Research Agreement.

        "Project A" and "Project B" shall have the meanings ascribed to such
terms in the Research Agreement.

        "Regulations" means regulations that have been promulgated by the United
States Department of the Treasury under the Code.



                                       -3-




<PAGE>   33



        "Research Agreement" means the Collaborative Research and Development
and License Agreement entered into by Becton, Nanogen and the Partnership
concurrently with the execution of this Agreement.

        "Research Milestone I" and "Research Milestone II" shall have the
meanings ascribed to such terms in the Research Agreement.

        "Research Program" shall have the meaning ascribed to such term in the
Research Agreement.

        2. Formation. The parties hereto hereby associate themselves as partners
and hereby form the Partnership as a general partnership under the laws of the
State of Delaware.

        3. Name. The name of the Partnership is The Nanogen/Becton Dickinson
Partnership, a Delaware general partnership. The name of the Partnership may be
changed at any time by the Partnership Management Committee of the Partnership.

        4. Principal Place of Business. The principal place of business of the
Partnership shall be located at such location as may hereafter be determined
from time to time by the Partnership Management Committee of the Partnership.

        5. Business. The business of the Partnership is to conduct the
Partnership Business.

        6. Term. The term of the Partnership shall continue until terminated as
provided in Section 10.

        7.  Management and Control.

        7.1 Partnership Management Committee. The Partnership and the
Partnership Business shall be managed by and under the direction of a
Partnership Management Committee which shall consist of six (6) members. The
Becton Partner shall appoint three (3) members and the Nanogen Partner shall
appoint three (3) members. The initial members shall consist of one (1) person
appointed by each Partner with expertise in (a) finance, (b) general management
and (c) research and development. The initial members to be appointed by each of
the Partners are listed on Exhibit A hereto. The Partnership Management
Committee shall be responsible for strategic planning and, among other things,
shall adopt a summary business plan for each fiscal year and a budget for each
fiscal quarter of the Partnership which shall govern the direction of the
Partnership Business.

        7.2 Major Decisions. No action shall be taken or sum expended or
obligation incurred by the Partnership, any Partner or any Affiliate of any
Partner with respect to a matter within the scope of any of the "Major
Decisions" affecting the Partnership and/or the Partnership Business,


                                       -4-




<PAGE>   34



unless such Major Decision shall have been approved by a majority vote of the
Partnership Management Committee (except for matters listed in Section *** where
the affirmative vote of seventy-five percent (75%) of the Partnership Management
Committee is required) made in writing. The following are "Major Decisions"
affecting the Partnership and/or the Partnership Business:

               (1) adopting and approving a budget for the Partnership Business
        for each fiscal year and each fiscal quarter of the Partnership;

               (2) adopting and approving a summary business plan for the
        Partnership Business for each fiscal year of the Partnership, and
        departing in any material respect from the summary business plan adopted
        by the Partnership for any fiscal year;

               (3) adopting and approving a budget and clinical plan under the
        Research Agreement for each fiscal quarter of the Partnership, and
        departing in any material respect from such budget and plan;

               (4) appointing a Project Manager within thirty (30) days
        following the date hereof to manage the day-to-day affairs of the
        Partnership;

               (5) making any single expenditure or incurring any obligation
        with respect to the Partnership Business involving a sum in excess of
        $20,000 that is not provided for in the Partnership Business budget for
        the fiscal year in which such expenditure is to be made or such
        obligation is to be incurred;

               (6)  hiring of employees of the Partnership;

               (7) retention of legal counsel or accountants for the
        Partnership;

               (8) selecting a firm of certified public accountants and
        selecting accounting methods and making other decisions with respect to
        the treatment of various transactions for tax purposes;

               (9) approving the terms of and entering into a supply,
        manufacturing, sales, marketing or distribution agreement with any party
        (including the Partners and their Affiliates) relating to Products or
        any other products agreed to by the Partners;

               (10) entering into any license or sublicense agreement;

               (11) determining the insurance program for the Partnership, and
        any variations or changes thereto;

*** CONFIDENTIAL MATERIAL REDACTED AND FILED SEPARATELY WITH THE COMMISSION.

                                       -5-

       


<PAGE>   35



               (12) determining the amount, if any, of funds otherwise available
        for distribution to be withheld from distribution to the Partners (funds
        available for distribution to the Partners are those funds not needed
        for the Partnership's working capital purposes);

               (13) determining the maximum and minimum working capital
        requirements of the Partnership Business;

               (14) compromising or paying any claim in excess of *** arising
        out of the Partnership Business;

               (15) borrowing or lending any money on behalf of the Partnership
        or using any of the Partnership's property as security for loans;

               (16)  admitting additional Partners to the Partnership;

               (17) assigning, transferring, pledging, compromising or releasing
        any of the Partnership's claims or debts relating to the Partnership
        Business, except upon payment in full, or arbitrate or consent to the
        arbitration of any such disputes or controversies;

               (18) selling or mortgaging any Partnership property or interest
        therein or entering into any contract for such purposes;

               (19) the assumption by the Partnership of any liability for
        another or others by means of endorsement, or becoming guarantor or
        surety;

               (20) authorizing the confession of judgment against the
        Partnership;

               (21) designating a Partner as the Tax Matters Partner; and

               (22) any other decision or action which, considered prior to the
        making of such decision or the taking of such action, would be
        reasonably expected to have a substantial or material effect upon the
        Partnership and/or the Partnership Business as contrasted with decisions
        or actions which would be routine and in the ordinary course of the
        Partnership Business, including, but not limited to, a decision to enter
        into any business not specifically identified in Section 5.

        7.3 Operating Decisions. The Project Manager shall be responsible for
making all decisions affecting the Partnership which are not Major Decisions,
which decisions shall be hereinafter referred to as the "Operating Decisions."
Operating Decisions affecting the Partnership shall include, but shall not be
limited to, decisions with respect to the day to day management and operation of
the business of the Partnership and supervision of the employees



***CONFIDENTIAL MATERIAL REDACTED AND FILED SEPARATELY WITH THE COMMISSION.




                                       -6-




<PAGE>   36



of the Partnership, if any. The Project Manager shall report and be accountable
to the Partnership Management Committee.

        7.4 Resolution of Differences. (i) In the event that a Major Decision
cannot be reached by the Partnership Management Committee, the matter shall be
referred for further review and resolution solely pursuant to the consultation
and mediation procedures set forth in Article V of the Master Agreement or
through such other procedures as may be agreed upon in writing by the Partners.
In the absence of an agreement between the Partners on a proposed action through
these procedures, the action shall not be taken.

               (ii) The parties agree that the procedures set forth in this
Section 7.4 shall be the sole procedures to be followed in any case where a
Major Decision cannot otherwise be reached by the Partnership Management
Committee.

        7.5 No Partner May Act for the Partnership. Unless specifically
authorized to act for the Partnership by this Agreement, or by a decision made
pursuant to this Agreement, no Partner shall have any power or authority to act
for the Partnership in any manner. Accordingly, no Partner, unless so
authorized, shall have the power or authority to execute any instrument in the
Partnership's name, or to commit or obligate the Partnership to any liability,
obligation, undertaking, agreement or contract in any other way. Except as
otherwise authorized herein, all documents to be executed on behalf of the
Partnership shall not bind the Partnership or any Partner unless executed by all
of the Partners.

        7.6 Representatives of Each Partner. Each Partner shall designate in
writing to the other Partner the names and business addresses of its
representatives who shall be appointed to the Partnership Management Committee.
Any such representative may be replaced by a successor representative by notice
in writing to the Partnership and the other Partner.

        7.7 Meetings. The Partnership Management Committee shall meet from time
to time, but at least once every three (3) months during the term of this
Agreement, at a mutually agreed location. Meetings of the Partnership Management
Committee may be called by either Partner at any time, by sending written or
facsimile notice or by giving oral notice (which shall be confirmed in writing
immediately thereafter) to the other Partner at least ten (10) days prior to the
meeting date. A Partner may waive notice of a meeting. Members of the
Partnership Management Committee may participate in meetings by means of
conference telephone or similar communications equipment by means of which all
persons participating in the meeting can hear each other, and such participation
in a meeting shall constitute presence in person at the meeting. Members of the
Partnership Management Committee shall have the right to vote at meetings by
proxy. Within five (5) business days following each meeting, the Partnership
Management Committee shall cause to be prepared a written summary of such
meeting.


                                       -7-




<PAGE>   37



        7.8 Buyout.

        (a) Within forty-five (45) days following the occurrence of any one of
the following events (each a "Buyout Option Event"): (i) if a Partner does not
make contributions to the capital of the Partnership in addition to those
contributions required by Section 8.1 upon a proposal therefor, (ii) if
cumulative Net Sales (as defined below) of Products to third-party end users are
less than *** over a four-year period commencing upon the first sale of the
first Product or (iii) if the Partnership Business does not achieve a profit
(calculated in accordance with generally accepted accounting principles) for at
least one fiscal year ending prior to January 1, 2005, either Partner or an
Affiliate of either Partner will have the right, but not the obligation, to
initiate the buyout procedures (the initiating Partner, the "Offeror") set forth
in this Section 7.8 by delivering written notice thereof (the "Offering Notice")
to the other Partner (the "Offeree") which shall constitute an offer by the
Offeror to purchase the Offeree's Partnership Interest in the Partnership at its
fair market value. For purposes of this Section 7.8(a), "Net Sales" shall mean,
with respect to any Product, the invoiced sales price of such Product billed to
independent customers who are not Affiliates, less to the extent actually
included in the invoiced sales price (i) credits, allowances, discounts and
rebates to, and chargebacks from the account of, such independent customers for
spoiled, damaged, out-dated and returned Product; (ii) actual freight and
insurance costs incurred in transporting such Product in final form to such
customers; (iii) cash, quantity and trade discounts, rebates and other price
reduction programs; (iv) sales, value-added and other direct taxes incurred; and
(v) customs duties, surcharges and other governmental charges incurred in
connection with the exportation or importation of such Product in final form.

        (b) Within forty-five (45) days following the date of the Offering
Notice, the Partners shall take all necessary steps to determine the fair market
value of the Partnership and the purchase price of the Partnership Interest as
set forth in subsection (h) below (the "Purchase Price"). The Partners shall set
forth the Purchase Price in a written notice delivered to both Partners (the
"Price Determination Notice").

        (c) Within thirty (30) days following the date of the Price
Determination Notice, the Offeree shall elect, at its sole option, by written
notice (the "Election Notice") to the Offeror (A) to sell its Partnership
Interest in the Partnership to the Offeror or (B) to buy the Partnership
Interest of the Offeror at the Purchase Price. Thereafter, the party designated
in the Election Notice as selling its Partnership Interest shall be referred to
as the Selling Party and the party designated in the Election Notice as
purchasing the Partnership Interest shall be referred to as the Purchasing
Party.

        (d) The purchase and sale pursuant to this Section 7.8 shall be
accomplished through an escrow established at a title insurance or escrow
company mutually approved by the Selling Party and the Purchasing Party, and
shall be consummated within forty-five (45) days following the effective date of
the Price Determination Notice. The Partners shall execute such further
instructions as the escrow holder and the Purchasing Party reasonably may
require to consummate


***CONFIDENTIAL MATERIAL REDACTED AND FILED SEPARATELY WITH THE COMMISSION.



                                       -8-




<PAGE>   38



such escrow, provided such instructions are not inconsistent with the terms of
this Agreement. Closing costs shall be shared equally by the Partners. The
Selling Party shall transfer to the Purchasing Party the entire Partnership
Interest of the Selling Party free and clear of all liens, security interests
and competing claims, and shall deliver to the Purchasing Party such instruments
of transfer and such evidence of due authorization, execution and delivery and
of the absence of such liens, security interests or competing claims as the
Purchasing Party shall reasonably request. At the closing, the Purchasing Party
shall pay the Purchase Price to the Selling Party by a wire transfer of
immediately available funds to a bank account designated by the Selling Party.

        (e) The Purchasing Party shall, effective as of the date of the closing
described in paragraph (d) above, indemnify and hold harmless the Selling Party
from and against any and all claims, liabilities, causes of action, liens,
charges and all other matters arising out of or in connection with the
Partnership and the Partnership Business, whether arising prior to or subsequent
to the date of the closing, except for unknown liabilities arising prior to the
date of closing and not taken into account in calculating the Purchase Price and
except for continuing obligations of the Selling Party pursuant to the Research
Agreement. If the Selling Party or any Affiliate of the Selling Party is a
guarantor of any obligations of the Partnership or otherwise liable thereon,
prior to closing the Purchasing Party shall use reasonable best efforts to
obtain a release of each such guaranty or liability in form and content
reasonably acceptable to the Selling Party and its guarantor Affiliates. If such
release cannot be obtained prior to closing, the Purchasing Party shall hold the
Selling Party harmless with respect to such guaranties and liabilities in form
and content reasonably acceptable to the Selling Party and its guarantor
Affiliates.

        (f) Either the Purchasing Party or the Selling Party shall have the
right to seek specific performance of this Section 7.8 in a court of competent
jurisdiction, and the other Party shall not plead as a defense that an adequate
remedy at law exists.

        (g) Upon the occurrence of a Buyout Option Event, if neither Partner
institutes the buyout provisions set forth in Section 7.8(a), then the
Partnership shall be dissolved pursuant to Section 10.1 unless the Partners
otherwise agree to continue the Partnership.

        (h)(i) If required by subsection (b) above, each Partner will select a
qualified appraiser who will determine the fair market value of the Partnership.
The appraisers shall value the Partnership based on the value of the Partnership
Business and, therefore, to the extent that the appraisers utilize historical
financial information in their analysis, they shall take into account not only
the historical net profit or loss of the Partnership for financial reporting
purposes and related cash flows but also the historical Profit or Loss for
financial reporting purposes (as defined in Section 2.3(c)(ii) of the Master
Agreement) and related cash flows. In addition, the appraisers' analysis shall
take into consideration the value of the underlying tangible and intangible
assets and the liabilities of the Partnership Business. To the extent that the
Selling Party or an Affiliate


                                       -9-




<PAGE>   39



of the Selling Party is to perform any service or other function relating to the
Partnership Business subsequent to the buyout, the amounts to be or projected to
be paid for such service or function shall be taken into account by the
appraisers in determining profit, loss and related cash flows projected to be
generated by the Partnership Business subsequent to the buyout. For purposes of
this Section 7.8(h)(i), the Partnership Business for periods subsequent to the
buyout shall mean the same functions and activities encompassing the Partnership
Business as defined in the Master Agreement without regard to whether the
parties described in such definition are the parties performing such functions
or activities after the buyout.

          (ii) If the fair market value of the Partnership determined by the
higher of the two appraisals (the "Higher Initial Appraisal") is not greater
than *** of the fair market value of the Partnership determined by the lower of
the two appraisals (the "Lower Initial Appraisal"), the fair market value of the
Partnership will be the average of the two appraisals; however, if the resulting
value of the Partnership would not fall within this range, the two appraisers
selected by the parties will select a third qualified appraiser to determine the
fair market value of the Partnership. If the Higher Initial Appraisal is greater
than *** but not greater than *** of the Lower Initial Appraisal, then the fair
market value of the Partnership will be equal to the average of the two of the
three appraisals that are closest to one another (or if the highest and lowest
appraisal are equidistant from the middle, then such fair market value will be
equal to the middle appraisal). If the fair market value of the Partnership
determined by the Higher Initial Appraisal is greater than *** of the fair
market value of the Partnership determined by the Lower Initial Appraisal, then
the fair market value of the Partnership will be equal to either the Higher
Initial Appraisal or the Lower Initial Appraisal, whichever is closest to the
third appraisal (or if the Higher Initial Appraisal and the Lower Initial
Appraisal are equidistant from the third appraisal, then such fair market value
will be equal to the third appraisal). Each Partner will pay the cost of the
appraiser it selects. Such parties will split the costs of a third appraiser if
used. The fair market value of the Selling Partner's Partnership Interest shall
be an amount equal to the balance that the Selling Partner would have in its
Capital Account for purposes of Section 10.3(d) if the Partnership were
liquidated at the time that the fair market value of the Partnership was the
value determined under this Section 7.8(h). For purposes of determining such
Capital Account balance, in applying Section 8.3(b), the value of the
Partnership's assets shall be the value of the assets of the Partnership
Business determined under this Section 7.8(h) in determining the fair market
value of the Partnership.


***CONFIDENTIAL MATERIAL REDACTED AND FILED SEPARATELY WITH THE COMMISSION.


                                      -10-




<PAGE>   40



        8.     Capital Contributions, Partner Loans and Capital Accounts.

        8.1 Contributions by the Partners.

        (a)  Becton Partner's Contribution.

               (i) Concurrently with the execution and delivery of this
Agreement, Becton is contributing to the Partnership on behalf of the Becton
Partner all of Becton's rights to the results of the research undertaken under,
and all of its other rights under, the Prior Research Agreement. The Partners
agree that such contribution has a value of $700,000 which shall be credited to
the Becton Partner's Capital Account.

               (ii) Concurrently with the execution and delivery of this
Agreement, Becton is contributing the Becton Intellectual Property License to
the Partnership on behalf of the Becton Partner. The Partners agree that such
contribution does not have an ascertainable value and that no amount shall be
credited to the Becton Partner's Capital Account in respect thereof.

               (iii) The Becton Partner hereby agrees to make the following
contributions to the Partnership for use by the Partnership exclusively in the
Research Program:

                      (A) Four (4) cash contributions of $575,000 each, within
        five (5) business days following each of September 30, 1997, December
        31, 1997, March 31, 1998 and June 30, 1998.

                      (B) Upon the successful completion of Research Milestone I
        by December 31, 1997, and Research Milestone II by June 30, 1998, for
        either Research Project A or Research Project B, cash totaling a minimum
        of $5,000,000 for use in the Research Program, to be made in four (4)
        installments of $1,250,000 each, payable on July 1, 1998, October 1,
        1998, January 1, 1999 and April 1, 1999, unless otherwise agreed upon
        by the Partners.

               (iv) In addition to and after the amounts that are contributed
under Section 8.1(a)(iii) to fund the Research Program, commencing on July 1,
1999 and quarterly thereafter with the last payment to be made on April 1,
2001, the Becton Partner hereby agrees to make quarterly contributions in the
minimum amounts of $1,250,000 each to fund additional Partnership research.

Each contribution made pursuant to this Section 8.1(a)(iv) shall be conditioned
upon the achievement of certain milestones to be mutually agreed upon by the
Partners thirty (30) days prior to the commencement of the twelve-month periods
ending June 30, 1999 and June 30, 2001, respectively.

               (v) In addition to the contributions set forth above in Sections
8.1(a)(iii) and (iv) to fund the Research Program and any additional Partnership
research, the Becton Partner hereby agrees to make cash contributions to the
Partnership in such amounts and at such times as are required for the
Partnership to pay the manufacturing start-up and promotional and marketing




***CONFIDENTIAL MATERIAL REDACTED AND FILED SEPARATELY WITH THE COMMISSION.



                                      -11-

              


<PAGE>   41



allowances to be included in the License Agreement between Becton and the
Partnership as described in Section 2.3 of the Master Agreement.

        (b) Nanogen Partner's Contribution.

            (i) Concurrently with the execution and delivery of this Agreement,
Nanogen is contributing to the Partnership on behalf of the Nanogen Partner all
of Nanogen's rights to the results of the research undertaken under, and all of
its other rights under, the Prior Research Agreement. The Partners agree that
such contribution does not have an ascertainable value and that no amount shall
be credited to the Nanogen Partner's Capital Account in respect thereof.

            (ii) Concurrently with the execution and delivery of this Agreement,
Nanogen is contributing the Nanogen Intellectual Property License to the
Partnership on behalf of the Nanogen Partner. The Partners agree that such
contribution does not have an ascertainable value and that no amount shall be
credited to the Nanogen Partner's Capital Account in respect thereof.

            (iii) Upon the successful completion of Research Milestone I by
December 31, 1997, and Research Milestone II by June 30, 1998, in both cases for
either Research Project A or Research Project B, the Nanogen Partner hereby
agrees to contribute to the Partnership at the same time or times as the Becton
Partner contributes cash to the Partnership under Section 8.1(a)(iii)(B) cash
for use by the Partnership exclusively in the Research Program equal to one
third (1/3) of the amount of cash contributed by the Becton Partner pursuant to
Section 8.1(a)(iii)(B).

            (iv) In addition to and after the amounts that are contributed under
8.1(b)(iii) hereof to fund the Research Program, the Nanogen Partner hereby
agrees to make the following contributions to the Partnership to fund additional
Partnership research:

                      (A) After the amounts contributed under Sections
        8.1(a)(iii) and 8.1(b)(iii) hereof, cash to fund the first $1,000,000
        of research costs in excess of those funded pursuant to Sections
        8.1(a)(iii) and 8.1(b)(iii).

                      (B) After the amount contributed under Section
        8.1(b)(iv)(A) hereof, at the same time or times as the Becton Partner
        contributes cash to the Partnership under Section 8.1(a)(iv) hereof,
        cash equal to one third (1/3) of the amount of cash contributed by the
        Becton Partner pursuant to Section 8.1(a)(iv).

            (v) In addition to the contributions set forth above in Sections
8.1(b)(iii) and (iv) to fund the Research Program and any additional Partnership
research, the Nanogen Partner hereby agrees to make cash contributions to the
Partnership in such amounts and at such times as are required for the
Partnership to pay the manufacturing start-up allowance to be included in the
License Agreement between Nanogen and the Partnership as described in Section
2.3 of the Master Agreement


                                      -12-

 

*** CONFIDENTIAL MATERIAL REDACTED AND FILED SEPARATELY WITH THE COMMISSION.

<PAGE>   42




        (c) Limit on Contributions; Partner Loans. Other than the contributions
set forth in Sections 8.1(a) and (b) hereof, neither Partner shall be obligated
to make any contributions to the Partnership. The total amount contributed by
the Partners to the Partnership under Sections 8.1(a)(i), (iii), (iv) and (v)
and Sections 8.1(b)(iii) and (iv) shall not exceed *** unless the Partners
mutually agree otherwise in writing. Either or both Partners may, but neither is
obligated to, make loans to the Partnership to fund any needs of the
Partnership's Business in excess of such amount. Any such loans shall have such
terms and conditions as the Partner making any such loan and the Partnership
agree and such agreement by the Partnership shall be made in accordance with
Section 7.2(15).

        8.2 Withdrawal. Except as expressly set forth herein, no Partner shall
be entitled to withdraw any portion of its capital contribution or Capital
Account balance.

        8.3 Capital Accounts. A single Capital Account shall be maintained for
each Partner (regardless of the class of interests owned by such Partner and
regardless of the time or manner in which such interests were acquired) in
accordance with the capital accounting rules of section 704(b) of the Code, and
the Regulations thereunder (including particularly Section 1.704-1(b)(2)(iv) of
the Regulations).

        (a) In general, under such rules, a Partner's Capital Account shall be:

               (i) Increased by (1) the amount of money contributed by the
Partner to the Partnership (including the amount of any Partnership liabilities
that are assumed by such Partner other than in connection with distribution of
Partnership property); (2) the fair market value of property contributed by the
Partner to the Partnership (net of liabilities secured by such contributed
property that the Partnership is considered to assume or take subject to under
section 752 of the Code); and (3) allocations to the Partner of Partnership
income and gain (or item thereof), including income and gain exempt from tax;

               (ii) Decreased by (1) the amount of money distributed to the
Partner by the Partnership (including the amount of such Partner's individual
liabilities that are assumed by the Partnership other than in connection with
contribution of property to the Partnership); (2) the fair market value of
property distributed to the Partner by the Partnership (net of liabilities
secured by such distributed property that such Partner is considered to assume
or take subject to under section 752 of the Code); (3) allocations to the
Partner of expenditures of the Partnership not deductible in computing its
taxable income and not properly chargeable to capital account; and (4)
allocations to the Partner of Partnership loss and deduction (or item thereof);
and

               (iii) Increased or decreased by any adjustments to such Partner's
tax basis in its Partnership Interest pursuant to section 50(c)(5) of the Code;
and



                                      -13-

 


*** CONFIDENTIAL MATERIAL REDACTED AND FILED SEPARATELY WITH THE COMMISSION.
<PAGE>   43



               (iv) Where section 704(c) of the Code applies to Partnership
property or where Partnership property is revalued pursuant to Section
1.704-1(b)(2)(iv)(f) of the Regulations, adjusted in accordance with Section
1.704-1(b)(2)(iv)(g) of the Regulations as to allocations to the Partners of
depreciation, depletion, amortization and gain or loss, as computed for book
purposes with respect to such property.

        (b) When Partnership property is revalued pursuant to Section
1.704-1(b)(2)(iv)(f) of Regulations or distributed in kind (whether in
connection with liquidation and dissolution of the Partnership or of a Partner's
Partnership Interest or otherwise), the Capital Accounts of the Partners shall
first be adjusted to reflect the manner in which the unrealized income, gain,
loss and deduction inherent in such property (that has not been reflected in the
Capital Account previously) would be allocated among the Partners if there were
a taxable disposition of such property for the fair market value of such
property (taking into account section 7701(g) of the Code) on the date of
distribution.

        (c) The Tax Matters Partner shall direct the Partnership's accountant to
make all necessary adjustments in each Partner's Capital Account as required by
the capital accounting rules of section 704(b) of the Code and the Regulations
thereunder.

        (d) If any Partner shall make any loan or loans to the Partnership or
advance money on its behalf, the amount of any such loan or advance shall not be
deemed an increase in or contribution to the Capital Account of the lending
Partner or entitle such lending Partner to any increase in its share of the
distributions from the Partnership.

        (e) Any Partner who shall receive a Partnership Interest or whose
Partnership Interest shall be increased by means of a transfer to it of all or
part of the Partnership Interest of another Partner, shall have a Capital
Account that reflects such transfer.

        8.4 Use of Partners' Contributions. The contributions made on behalf of
the Becton Partner pursuant to Sections 8.1(a)(i) and (ii) and on behalf of the
Nanogen Partner pursuant to Sections 8.1(b)(i) and (ii) shall be used
exclusively for the Partnership Business. The contributions made by the Becton
Partner pursuant to Section 8.1(a)(iii) and by the Nanogen Partner pursuant to
Section 8.1(b)(iii) shall be used exclusively for the Research Program. The
contributions made by the Becton Partner pursuant to Section 8.1(a)(iv) and by
the Nanogen Partner pursuant to Section 8.1(b)(iv) shall be used exclusively for
any research conducted by the Partnership in connection with the Partnership
Business in addition to that conducted pursuant to the Research Program. Any
contributions made by the Becton Partner pursuant to Section 8.1(a)(v) shall be
used for the payment of other costs and expenses incurred by the Partnership in
carrying on its Business and other liabilities and obligations of the
Partnership.

        9. Profits and Losses and Distributions.



                                      -14-

 


<PAGE>   44



        9.1 Partner's Distributive Share. A Partner's distributive share of the
Partnership's total income, gain, loss, deduction or credit (or items thereof),
which total shall be as shown on the annual federal income tax return prepared
by the Partnership's accountants or as finally determined by the Internal
Revenue Service or the courts, and as modified by the capital account
maintenance rules of section 704(b) of the Code and the Regulations thereunder
as implemented by Section 8.3, as applicable, shall be determined as provided in
this Section 9.

        (a) Except as otherwise provided in Sections 9(c) through 9(l):

               (i) Items of Partnership loss or deduction incurred in a
Partnership taxable year in connection with the Research Program or any
additional research conducted by the Partnership in connection with the
Partnership Business shall be allocated among the Partners in proportion to and
up to the amount of cash that the Becton Partner contributes pursuant to
Sections 8.1(a)(iii) and (iv) and the Nanogen Partner contributes to the
Partnership pursuant to Sections 8.1(b)(iii) and (iv) to fund such Research
Program or additional research.

               (ii) All items of Partnership loss or deduction for any
Partnership taxable year that are funded by the Becton Partner pursuant to
Section 8.1(a)(v) shall be allocated solely to the Becton Partner and that are
funded by the Nanogen Partner pursuant to Section 8.1(b)(v) shall be allocated
solely to the Nanogen Partner.

               (iii) Items of Partnership income, gain, deduction and loss that
are not allocated under Sections 9.1(a)(i) and (ii) shall be allocated among the
Partners proportionately in accordance with their respective Percentage
Interests.

Notwithstanding the foregoing provisions of this Section 9.1(a), items of
deduction and loss shall not be allocated to any Partner to the extent it would
create a deficit balance in excess of such Partner's obligation to restore its
Capital Account balance, computed in accordance with the rules of Section
1.704-1(b)(2)(ii)(d) of the Regulations (including such Partner's share of
Partnership Minimum Gain and Partner Nonrecourse Debt Minimum Gain as provided
in Sections 1.704-2(g) and 1.704-2(i)(5) of the Regulations). Any items of
deduction and loss which cannot be allocated to a Partner because of the
limitation set forth in the preceding sentence shall be allocated first to the
other Partner to the extent such other Partner would not be subject to such
limitation, and second any remaining amount to the Partners in the manner
required by the Code and the Regulations.

        (b) Solely for tax purposes, in determining each Partner's allocable
share of the taxable income or loss of the Partnership, depreciation, depletion,
amortization and gain or loss with respect to any contributed property, or with
respect to revalued property where Partnership property is revalued pursuant to
Section 1.704-1(b)(2)(iv)(f) of the Regulations, shall be allocated to the
Partners under the traditional method as provided in Section 1.704-3(b) of the
Regulations.



                                      -15-




<PAGE>   45



        (c) Minimum Gain Chargeback. Notwithstanding anything to the contrary in
this Section 9, if there is a net decrease in Partnership Minimum Gain or
Partner Nonrecourse Debt Minimum Gain (as such terms are defined in Sections
1.704-2(b) and 1.704-2(i)(2), respectively, of the Regulations) during a
Partnership taxable year, then each Partner shall be allocated items of
Partnership income and gain for such year (and, if necessary, for subsequent
years), to the extent required by, and in the manner provided in, Section
1.704-2 of the Regulations. This provision is intended to be a "minimum gain
chargeback" within the meaning of Sections 1.704-2(f) and 1.704-2(i)(4) of the
Regulations and shall be interpreted and implemented as therein provided.

        (d) Qualified Income Offset. Subject to the provisions of Section
9.1(c), but otherwise notwithstanding anything to the contrary in this Section
9, if any Partner's Capital Account has a deficit balance in excess of such
Partner's obligation to restore its Capital Account balance, computed in
accordance with the rules of Section 1.704-l(b)(2)(ii)(d) of the Regulations
(including such Partner's share of Partnership Minimum Gain and Partner
Nonrecourse Debt Minimum Gain as provided in Sections 1.704-2(g) and
1.704-2(i)(5) of the Regulations), then sufficient amounts of income and gain
(consisting of a pro rata portion of each item of Partnership income, including
gross income, and gain for such year) shall be allocated to such Partner in an
amount and manner sufficient to eliminate such deficit as quickly as possible.
This provision is intended to be a "qualified income offset" within the meaning
of Section 1.704-1(b)(2)(ii)(d) of the Regulations and shall be interpreted and
implemented as therein provided.

        (e) Subject to the provisions of section 704(c) of the Code and Sections
9.1(b) through (d), gain recognized (or deemed recognized under the provisions
hereof) upon the sale or other disposition of Partnership property, which is
treated as depreciation recapture, shall be allocated to the Partner who was
entitled to deduct such depreciation.

        (f) Except as otherwise provided in Section 9.1(j), if and to the extent
any Partner is deemed to recognize income as a result of any loans described
herein pursuant to the rules of sections 1272, 1273, 1274, 1274A, 7872, 482 or
483 of the Code, or any similar provision now or hereafter in effect, any
corresponding resulting deduction of the Partnership shall be allocated to the
Partner who is charged with the income. Subject to the provisions of section
704(c) of the Code and Sections 9.1(b) through (d), if and to the extent the
Partnership is deemed to recognize income as a result of any loans to a Partner
described herein pursuant to the rules of


                                      -16-




<PAGE>   46



sections 1272, 1273, 1274, 1274A, 7872, 482 or 483 of the Code, or any similar
provision now or hereafter in effect, such income shall be allocated to such
Partner.

        (g) Except as otherwise required by law, tax credits shall be allocated
among the Partners in proportion to the amounts of contributions made to the
Partnership by each Partner that were used by the Partnership to fund any
expenditures giving rise to such tax credit, or if no expenditure gave rise to
the tax credit, pro rata in accordance with the manner in which Partnership
profits are allocated to the Partners under Section 9(a)(iii) as of the time the
credit property is placed in service or if no property is involved, as of the
time the credit is earned. Recapture of any tax credit required by the Code
shall be allocated to the Partners in the same proportion in which such tax
credit was allocated.

        (h) Except as provided in Sections 9.1(f) and (g) or as otherwise
required by law, if the Partnership Interests of the Partners are changed herein
during any taxable year, all items to be allocated to the Partners for such
entire taxable year shall be prorated on the basis of the portion of such
taxable year which precedes each such change and the portion of such taxable
year on and after each such change according to the number of days in each such
portion, and the items so allocated for each such portion shall be allocated to
the Partners in the manner in which such items are allocated as provided in this
Section 9 during each such portion of the taxable year in question.

        (i) Any special allocation of income or gain pursuant to Section 9.1(d)
shall be taken into account in computing subsequent allocations of income and
gain pursuant to this Section 9 so that the net amount of all such allocations
to each Partner shall, to the extent possible, be equal to the net amount that
would have been allocated to each such Partner pursuant to the provisions of
this Section 9 if such special allocations of income or gain under Section
9.1(d) had not occurred.

        (j) (i) Items of deduction and loss attributable to recourse liabilities
of the Partnership (within the meaning of section 1.752-1(a)(1) of the
Regulations but excluding Partner nonrecourse debt within the meaning of Section
1.704-2(b)(4) of the Regulations) shall be allocated among the Partners in
accordance with the ratio in which the Partners share the economic risk of loss
(within the meaning of section 1.752-2 of the Regulations) for such liabilities.

            (ii) Items of deduction and loss attributable to Partner nonrecourse
debt within the meaning of Section 1.704-2(b)(4) of the Regulations shall be
allocated to the Partners bearing the economic risk of loss with respect to such
debt in accordance with Section 1.704-2(i) of the Regulations.

            (iii) Items of deduction and loss attributable to Partnership
nonrecourse liabilities within the meaning of Section 1.704-2(b)(1) of the
Regulations shall be allocated among the Partners proportionately in accordance
with their Partnership interests.


                                      -17-

           


<PAGE>   47




        (k) Subject to the provisions of Sections 9.1(c) through (j), items of
income and gain shall be allocated to the Partners in the following priority:

               (i) First, to those Partners who have had items of loss or
deduction allocated to them under Section 9.1(j)(i), in the amount of, and
proportionate to, the amount of such items of loss or deduction.

               (ii) Second, if allocations of items of Partnership deduction and
loss have been made to the Partners under Sections 9.1(a)(i) and (ii), then in
the amount of, and proportionate to, the amount of such items of loss and
deduction.

               (iii) Third, the balance among the Partners in proportion to
their respective Percentage Interests.

        (1) Notwithstanding Section 9.1(a) and Section 9.1(k), but subject to
the provisions of Section 9.1(c) through (j), gain or loss which is recognized
(or deemed to be recognized) upon the sale, exchange or other disposition of all
or substantially all the assets of the Partnership or of any partnership in
which the Partnership holds an interest (whether directly or indirectly) or upon
the dissolution of the Partnership or any partnership in which the Partnership
holds an interest (whether directly or indirectly) and any unrealized gain or
loss to be allocated to the Partners' Capital Accounts under Section 8.3,
including without limitation Section 8.3(b), upon a distribution of Partnership
property to a Partner in connection with the liquidation of the Partnership or a
Partner's Partnership Interest shall be allocated in the following priority:

               (i) Any such gain shall be allocated to the Partners having
deficit balances in their Capital Accounts (computed after giving effect to all
contributions, distributions, allocations and other Capital Account adjustments
for all taxable years, including the year during which such liquidation or
dissolution occurs and including such Partner's share of Partnership Minimum
Gain and Partner Nonrecourse Debt Minimum Gain as provided in Sections
1.704-2(g) and 1.704-2(i)(5) of the Regulations), to the extent of, and in
proportion to, those deficits; and

               (ii) Any such gain in excess of any amount of gain allocated
under Section 9.1(l)(i) hereof and any such loss shall be allocated to the
Partners so as to make, as nearly as possible:

                      (1) First, the balance in the Becton Partner's Capital
        Account (computed in the same manner as provided parenthetically in
        Section 9.1(l)(i)) at least equal to any Becton Partner Excess
        Unrecovered Cash Contributions.




                                      -18-

           


<PAGE>   48



                      (2) Second, the balance in excess of the Becton Partner
        Excess Unrecovered Cash Contributions in the Becton Partner's Capital
        Account, computed in the same manner as provided parenthetically in
        Section 9.1(l)(i), equal to 50 percent of, and the balance in the
        Nanogen Partner's Capital Account, computed in such manner, equal to 50
        percent of, the sum of the amount by which the balances in the Partners'
        Capital Accounts, computed in such manner, exceed the Becton Partner
        Excess Unrecovered Cash Contributions.

        9.2  Distributions.

        (a) Subject to Section 9.2(d), prior to dissolution of the Partnership,
the Partnership shall distribute Net Cash Flow of the Partnership no later than
sixty (60) days following the close of each fiscal year, in an amount equal to
the aggregate excess, if any, for all taxable years of (i) the sum of the
results for each taxable year of multiplying the Net Tax Income for each taxable
year by the Assumed Tax Rate applicable to each tax year over (ii) the sum of
amounts previously distributed pursuant to Sections 9.2(a) and (b).
Distributions pursuant to this Section 9.2(a) shall be made to the Partners
ratably in the proportions in which the aggregate Net Tax Income for such
taxable years has been allocated to them for federal income tax purposes
pursuant to Section 9.1.

        (b) Subject to the mandatory distributions set forth in Section 9.2(a)
and Section 9.2(d), prior to dissolution of the Partnership, the Partnership
shall distribute Net Cash Flow of the Partnership to the Partners, as soon as is
practical following the end of each fiscal quarter, as follows:

               (i) To the Partners in such amounts so that, to the extent
possible, the Becton Partner has received 60 percent, and the Nanogen Partner
has received 40 percent, of the Partnership Business Cash for such quarter
until the Becton Partner Unrecovered Cash Contributions are equal to the Nanogen
Partner Unrecovered Cash Contributions; and

               (ii) Thereafter, in proportion to the Partners' Percentage
Interests.

        (c) Except as otherwise provided herein, no Partner shall have a
priority over any other Partner as to return of its contributions to the
Partnership or as to income.

        (d) Any other provision of this Agreement to the contrary
notwithstanding, no distribution shall be made which would render the
Partnership insolvent or which is prohibited by the terms of any Partnership
indebtedness.




                                      -19-

           


<PAGE>   49



        10.  Dissolution and Liquidation.

        10.1 Dissolution. The Partnership shall be dissolved, and its business
wound up, upon the happening of any of the following events:

            (a) the Partners mutually agree in writing to dissolve the
Partnership;

            (b) the termination of the Research Agreement as provided in
sections 8.1 (b), (f) or (g) or section 8.2;

            (c) the sale of all, or substantially all, of the Partnership's
assets and the collection of all of the proceeds of such sale;

            (d) the insolvency or bankruptcy of the Partnership;

            (e) the transfer of all of a Partner's Partnership Interest to the
other Partner;

            (f) the bankruptcy, insolvency or dissolution of any Partner; or

            (g) the failure of the parties to initiate the buyout procedure set
forth in Section 7.8 within forty-five (45) days following the occurrence of a
Buyout Option Event.

        A Partner shall be deemed bankrupt or insolvent if it shall (a) commence
a case under any bankruptcy law or otherwise seek protection from creditors
generally under any bankruptcy, insolvency, moratorium or similar law, (b) have
a case or proceeding commenced against it under any of such laws which remains
undismissed or unstayed for a period of ninety (90) days after it receives
notice or otherwise becomes aware of such case or proceeding, (c) suffer the
entry of a decree or order appointing, or otherwise consent in any manner to the
appointment of, a receiver, liquidator, assignee, custodian, trustee or similar
official of such Partner or for any material portion of such Partner's property
or (d) make a general assignment for the benefit of creditors.

        10.2 Winding-up. Upon the occurrence of an event of dissolution, the
Partnership shall be wound up and liquidated. The Partnership Management
Committee or, if there is no Partnership Management Committee, a liquidator
appointed by mutual agreement of the Partners shall proceed with the dissolution
and the final distribution. In the dissolution, the Partnership Management
Committee or such liquidator shall use its best efforts to reduce to cash and
cash equivalent items such assets of the Partnership as the Partnership
Management Committee or such liquidator shall deem it advisable to sell, subject
to obtaining fair value for such assets and any tax or other legal
considerations. A reasonable time shall be allowed for the orderly winding up of
the business and affairs of the Partnership and the liquidation of its assets in
order to minimize any losses otherwise attendant upon such a winding up,
provided that the liquidation is carried


                                      -20-

            


<PAGE>   50



out in conformity with the requirements of this Section 10.2 and section
1.704-1(b)(2)(ii)(b)(2) and (3) of the Regulations.

        10.3 Order of Dissolution. In settling accounts after dissolution, the
assets of the Partnership shall be distributed as expeditiously as possible in
the following order not later than the end of the taxable year of the
liquidation (i.e., the date upon which the Partnership ceases to be a going
concern as provided in section 1.704-1(b)(2)(ii)(g) of the Regulations), or if
later, within ninety (90) days following the date of such liquidation:

        (a) To creditors, including the Partners to the extent of any unpaid
expenses or any outstanding loan or advance made in accordance with this
Agreement;

        (b) To the payment of the costs of winding up the affairs of,
liquidating and dissolving the Partnership including, without limitation,
expenses of selling assets of the Partnership, discharging the liabilities of
the Partnership, distributing the assets of the Partnership and terminating the
Partnership in accordance with Section 10.2;

        (c) To the establishment of reasonable reserves to provide for
obligations to creditors;

        (d) Thereafter, to the Partners in proportion to, and in return of,
their respective Capital Accounts determined after having reflected in such
Capital Accounts all adjustments, including adjustments for the taxable year of
the Partnership during which the liquidation occurs, as are required by this
Agreement and by section 1.704-1(b) of the Regulations, such adjustments to be
made within the time specified in such Regulations.

        10.4 Orderly Methods of Liquidating Payments. Notwithstanding anything
to the contrary in this Section 10, if required to maximize the proceeds of
liquidation, the Partnership Management Committee (or the liquidator chosen in
accordance with Section 10.2) may, with the consent of the Partners, implement
the distribution provisions of Section 10.3 by transfer, on behalf of the
Partners, of the assets of the Partnership to a liquidating trustee or trustees.

        11. Transfer of Partnership Interest of Partners.

        11.1 Conditions to Transfer of Partnership Interest of Partners. No
Partner may assign, pledge or otherwise transfer its Partnership Interest in the
Partnership except in compliance with the provisions of this Section 11 and any
transfer not in accordance with this Section 11 shall be null and void. In
addition, neither the Partnership nor the Partners shall be bound by any such
assignment or transfer until the Partnership receives the following:

        (a)  a counterpart of the instrument of assignment, executed and
acknowledged by the parties thereto;



                                      -21-

                    


<PAGE>   51



        (b) an opinion of counsel reasonably satisfactory to counsel for the
Partnership that such transfer is exempt from the registration requirements of
the Securities Act of 1933 and applicable state securities laws; and

        (c) an agreement of the transferee to be bound by the terms and
conditions of this Agreement in form and substance satisfactory to the
Partnership Management Committee.

        11.2  Restrictions on Transfer of Partnership Interest.

        (a) Either Partner may transfer any or all of its Partnership Interest
in the Partnership to any wholly-owned, direct or indirect, subsidiary thereof.

        (b) Either Partner may transfer all, but not less than all, of its
respective Partnership Interest in the Partnership to a third person, only upon
satisfaction of the following conditions and in accordance with the following
provisions:

               (i) The Partnership Interest to be sold shall have been first
offered for sale by the transferring Partner (for purposes of this Section 11.2,
the "Selling Partner") to the non-transferring Partner (for purposes of this
Section 11.2, the "Buying Partner") by written offer setting forth the price and
the terms and conditions of the proposed sale to a third person and the name and
address of the prospective purchaser. The offer shall provide that the Buying
Partner may purchase the Partnership Interest of the Selling Partner at the same
price and on the same terms and conditions as the proposed sale described in the
offer.

               (ii) *** following the receipt of such offer, the Buying Partner
may elect to purchase the Partnership Interest of the Selling Partner and shall
give notice of acceptance of the offer to the Buying Partner. Such notice shall
specify a date, time and place for the closing, which shall not be more than ***
days following the date of notice of acceptance of the Offer.

               (iii) Within *** following the receipt of such offer, the Buying
Partner may consent to the sale of the Partnership Interest of the Selling
Partner to the third person named in the offer at the same price and on the same
terms and conditions as the proposed sale described in the offer and shall give
notice of such consent to the Selling Partner.

               (iv) In the event that the Buying Partner has not given notice of
its election pursuant to this Section 11.2(b) to the Selling Partner within ***
following the receipt of such offer, the Buying Partner shall be deemed to have
consented to the sale of the Partnership Interest of the Selling Partner to the
third person named in the offer at the same price and on the same terms and
conditions as the proposed sale described in the offer.


***CONFIDENTIAL MATERIAL REDACTED AND FILED SEPARATELY WITH THE COMMISSION.


                                      -22-



<PAGE>   52



               (v) If the sale to a third person contemplated by Sections
11.2(b)(iii) and 11.2(b)(iv) is not completed within *** notice to the Selling
Partner of the consent or deemed consent, as the case may be, of the Buying
Partner to such sale, the Selling Partner shall no longer be free to sell its
Partnership Interest pursuant hereto and must again comply with the procedures
set forth in this Section 11.2(b) prior to transferring its Partnership Interest
to a third person.

        (c) Notwithstanding the foregoing, the Partners may agree in writing to
permit the transfer of any or all of their Partnership Interests upon the terms
and conditions set forth in such written agreement between the Partners. The
Partners may also transfer their Partnership Interests to each other upon such
terms and conditions as the Partners may agree.

        11.3 Section 754 Election. In the event of a transfer of all or part of
the Partnership Interest of a Partner, at the request of the party purchasing
such Partnership Interest or portion thereof, the Partnership Management
Committee shall cause the Partnership to elect, pursuant to Section 754 of the
Code, or the corresponding provisions of subsequent law, to adjust the basis of
Partnership property as provided in Section 734 and 743 of the Code.

        12.  Confidentiality; Covenants Against Competition.

        (a) Confidential Information. The parties hereto agree that the terms
and provisions of the Confidentiality Agreement shall remain in full force and
effect. The Partnership and the Partners hereby agree to be bound by the terms
and provisions thereof.

        (b) Covenant Not to Compete. (i) Except as provided below, during the
term of the Partnership, a Partner and its Affiliates (other than individuals)
shall not, unless acting with the consent of all of the Partners or in
accordance with paragraph (ii) below, directly or indirectly, participate in the
ownership, management, operation, control or financing of, or be connected as an
investor, partner, officer, director, principal, agent, representative,
consultant, or otherwise with, or use or permit its name to be used in
connection with, any business or other enterprise in competition with the
Partnership Business worldwide.

               (ii) If during the term of the Partnership a Partner or an
Affiliate of the Partner desires to pursue a business, venture or other
opportunity that would be competitive with the Partnership Business, it must
first offer such business, venture or other opportunity to the Partnership by
written notice to the Partnership Management Committee in as much detail as is
available, but in no event less that reasonable detail. The Partnership
Management Committee, acting through the members of the Partner who did not
submit such opportunity, shall respond within twenty (20) days thereafter to the
submitting Partner whether the Partnership elects to accept such offer. If such
offer is accepted, the funding for the new opportunity shall be mutually agreed
by the Partners. If the offer is declined or if the Partnership Management


***CONFIDENTIAL MATERIAL REDACTED AND FILED SEPARATELY WITH THE COMMISSION.


                                      -23-




<PAGE>   53



Committee does not respond within the prescribed period, the submitting Partner
is free to pursue such opportunity without limitation.

        13. Dispute Resolution. All disputes, controversies or claims arising
out of or related to (i) the interpretation or enforcement of this Agreement or
(ii) any breach, termination or claim of invalidity of this Agreement (excluding
in both (i) and (ii), however, any deadlock of the Partners or the Partnership
Management Committee relating to decisions regarding the business or conduct of
the Partnership as described in Section 7, which shall be handled as described
in Section 7.4) shall be governed by the terms and provisions of the Article V
of the Master Agreement.

        14.  Accounting and Records.

        14.1 Fiscal and Taxable Year. The fiscal year and the taxable year of
the Partnership shall be the year ended September 30th or such other year as is
required by the Code and the Regulations as the taxable year of the Partnership.

        14.2 Records. The Partnership shall keep, or cause to be kept, accurate
and complete records of all transactions of the Partnership in accordance with
principles and practices generally accepted for the accrual method of
accounting.

        14.3 Availability for Inspection. All of the Partnership's books of
account shall at all times be maintained at the principal place of business of
the Partnership and shall be open during regular business hours for inspection
and examination by the Partners for any purpose reasonably related to the
Partnership Business.

        14.4 Tax Returns; Statements of Capital Accounts. Becton shall use its
best efforts to prepare, or cause to be prepared, on behalf of the Partnership
and to distribute to the Partners no later than 30 days prior to the due date as
extended for each taxable year, for review, comment and approval within 14
business days after receipt, and then timely file, (i) Partnership income tax
returns (and related Partner information returns) reporting the taxable income
or loss and items thereof of the Partnership Business and such other tax
information relating to the Partnership and the Partnership Business as is
required to be set forth on such returns or is otherwise necessary to enable the
Partners to prepare their respective federal state and local income tax returns
and (ii) statements showing the calculation in accordance with the terms of this
Agreement of the Partners' respective Capital Accounts as of the end of each
fiscal year.

        14.5 Financial Statements. The Partnership shall furnish to the
Partners, before December 31st of each year, an annual audited financial report
of the Partnership prepared in accordance with generally accepted accounting
principles, including a balance sheet and profit and loss statement. The
Partnership shall also furnish the Partners with such interim financial
statements as the Partnership deems appropriate.


                                      -24-




<PAGE>   54




        15. Bank Accounts. The Partnership shall maintain a bank account or
accounts in which shall be deposited all funds of the Partnership. Withdrawals
from such account or accounts shall be made upon checks signed by all of the
Partners or by the Project Manager or any other person authorized to do so by
the Partnership Management Committee.

        16. Amendments. This Agreement may be amended only with the consent of
all the Partners.

        17. Notices. Any notice, request, demand, waiver, consent, approval, or
other communication which is required or permitted hereunder shall be in writing
and shall be deemed given only if delivered personally, by facsimile (upon
receipt of appropriate written confirmation) or sent by registered or certified
mail, return receipt requested, or by overnight courier service, postage prepaid
as follows:

        If to the Becton Partner, to:
        Becton Dickinson Venture LLC
        c/o Becton Dickinson Microbiology Systems
        7 Loveton Circle
        Sparks, MD 21152
        Attention: President

        With required copies to:

        Becton, Dickinson and Company
        1 Becton Drive
        Franklin Lakes, NJ 07417
        Attention: General Counsel

        If to the Nanogen Partner, to:

        NanoVenture LLC c/o Nanogen, Inc.
        10398 Pacific Center Court
        San Diego, CA 92121
        Attention: Chief Executive Officer
        Facsimile: (619) 546-7717



                                      -25-




<PAGE>   55



        With required copies to:

        Nanogen, Inc.
        10398 Pacific Center Court
        San Diego, CA 92121
        Attention:  General Counsel

        Thomas E. Sparks, Esq.
        Pillsbury Madison & Sutro LLP
        235 Montgomery Street
        San Francisco, CA 94104
        Facsimile: (415) 983-1200

or to such other address as the addressee may have specified in a notice duly
given to the sender as provided herein. Such notice, request, demand, waiver,
consent, approval or other communication will be deemed to have been given as of
the date so received or upon refusal to accept delivery of same or inability to
deliver because of failure to give notice of change of address as provided
herein.

        18. Tax Matters Partner; Elections. The Becton Partner is hereby
designated, and hereby agrees to discharge duly the duties of, the Tax Matters
Partner of the Partnership, as that term is defined in Section 6231(a)(7) of the
Code. Expenses incurred by the Tax Matters Partner in performing the duties as
Tax Matters Partner, including reasonable attorney's fees incurred to obtain
legal advice, guidance or services in connection with contesting any claim made
by the Internal Revenue Service, shall constitute expenses of the Partnership
and shall be paid by the Partnership. The Tax Matters Partner shall at all times
assure that each Partner is a Notice Partner (as defined in Section 6231(a)(8)
of the Code) with respect to the Partnership.

        The Tax Matters Partner shall promptly (a) notify the Partners of any
audit or other tax matter which is brought to the attention of the Tax Matters
Partner, by written notice from the Internal Revenue Service, and (b) forward to
all Partners copies of any notices, correspondence, reports or other
instruments, communications or documents received by the Tax Matters Partner in
connection therewith; provided, however, that the Tax Matters Partner, unless
approved by the Partners, shall not have the right (i) under Section
6229(b)(1)(B) of the Code or any successor to such provision to extend the
period of limitations set forth in Section 6229(a) of the Code or any successor
provision; (ii) to agree to any settlement of any alleged tax deficiency arising
with respect to Partnership taxable income or loss, credits or any item included
therein, a Partner's share thereof or other Partnership tax matter, or agree to
any adjustment of Partnership taxable income or loss, credits or any item
included therein, or a Partner's share thereof; (iii) to file any petition for
judicial review, or any other judicial proceeding, with respect to the
Partnership or any Partner's share of Partnership taxable income or loss,
credits or any item included therein, or any Partnership tax matter; or (iv) to
file any requests for administrative review or adjustment,


                                      -26-




<PAGE>   56



or other administrative relief, on behalf of the Partnership in any tax matter
or with respect to any Partner's share of Partnership taxable income or loss,
credits or any item included therein.

        19. Indemnity. The Partnership shall indemnify each Partner against
expenses actually and necessarily incurred by it in connection with the defense
or any settlement of any action, suit or proceeding brought or threatened in
which the Partner is or may be made a party, by reason of it being or having
been a Partner, except in relation to matters as to which (i) the Partner acted
beyond the scope of the Partnership Business, or (ii) in such action, suit or
proceeding, the Partner's actions shall have been adjudged to constitute gross
negligence, recklessness, willful misconduct or fraud in the performance of its
duties. Furthermore, each Partner shall indemnify the other Partner from and
against any liability incurred by such other Partner over and above the
proportionate share of any liabilities of the Partnership.

        20.  Miscellaneous.

        20.1 Binding Effect. Except as herein provided to the contrary, this
Agreement shall be binding upon and inure to the benefit of the parties hereto,
their personal representatives, and permitted successors and assigns.

        20.2 Written Amendment; Waiver. This Agreement may be amended only by a
written instrument executed by the parties hereto. The failure of any party at
any time or times to require performance of any provision hereof shall in no
manner affect its rights at a later time to enforce the same. No waiver by any
party of any condition or term in any one or more instances shall be construed
as a further or continuing waiver of such condition or term or any other
condition or term.

        20.3 Governing Law; Construction. This Agreement shall be governed by
and construed in accordance with the laws of the State of Delaware without
regard to its choice of laws principles. This Agreement shall be construed and
interpreted without application of any principle or rule to the effect that
ambiguities are to be construed against the party responsible for drafting the
agreement. The headings contained herein are for reference purposes only and
shall not in any way affect the meaning of this Agreement.

        20.4 Counterparts. This Agreement may be executed in any number of
counterparts, each of which shall be deemed an original, but all of which
together shall constitute one instrument.

        20.5 No Benefit to Others. The terms and provisions contained in this
Agreement are for the sole benefit of the parties and their successors and
assigns, and they shall not be construed as conferring and are not intended to
confer any rights on any other persons.

                            [SIGNATURES ON NEXT PAGE]


                                      -27-




<PAGE>   57




        IN WITNESS WHEREOF, the parties hereto have executed this Agreement as
of the day and year first above written.

                                      BECTON DICKINSON VENTURE LLC



                                      By s/ Vincent A. Forlenza
                                      ------------------------------------------


                                      Its President
                                          ---------
                                      BDMS
                                      ------------------------------------------


                                      NANOVENTURE LLC



                                      By /s/ Howard Birndorf
                                      ------------------------------------------

                                      Its Manager
                                          --------------------------------------





                                      -28-

                           



<PAGE>   58





                                    EXHIBIT B

                     COLLABORATIVE RESEARCH AND DEVELOPMENT
                              AND LICENSE AGREEMENT

         THIS AGREEMENT is dated as of October 1, 1997 by and among Becton,
Dickinson and Company, a New Jersey corporation, through its Becton Dickinson
Microbiology Systems Division, having a place of business at 7 Loveton Circle,
Sparks, Maryland 21152 (hereinafter, "Becton"), Nanogen, Inc., a California
corporation, having its principal office and place of business at 10398 Pacific
Center Court, San Diego, California 92121 (hereinafter, "Nanogen"), and The
Nanogen/Becton Dickinson Partnership, a Delaware general partnership having its
principal place of business at 10398 Pacific Center Court, San Diego, California
92121 (hereinafter, the "Partnership").

                                   R E C I T A L S

         WHEREAS, Nanogen has developed certain technology related to
electronically addressable microchip oligonucleotide arrays ("Arrays"); and

         WHEREAS, Becton has developed certain technology related to methods for
creating multiple copies of an oligonucleotide sequence known as Strand
Displacement Amplification ("SDA"); and

         WHEREAS, concurrently with the execution of this Agreement, respective
companies owned by Becton and Nanogen have formed the Partnership; and


                                      -1-
<PAGE>   59



         WHEREAS, the Partnership wishes to engage Becton and Nanogen to perform
certain research and development activities on behalf of the Partnership as
contemplated herein.

         NOW THEREFORE, in consideration of the mutual covenants and
undertakings contained herein, the parties hereby agree as follows:

         1.         DEFINITIONS

         As used in this Agreement:

         1.1 "Agreement" shall mean this agreement and any exhibits, appendices,
attachments or addenda hereto, and any renewals or extensions of this agreement.

         1.2 "Becton Intellectual Property" shall mean and include all
patentable and unpatentable inventions, ideas, discoveries, improvements, design
rights, semiconductor mask works, works of authorship, trade secrets, know-how
and any equivalents thereof which are in existence as of the Effective Date or
thereafter, as are necessary to make, have made, use or sell a Product and are
owned by Becton.

         1.3 "Becton Patent Rights" shall mean all United States patents and
patent applications owned by Becton which are in existence as of the Effective
Date or thereafter and contain a claim necessary to make, have made, use or sell
a Product, including all divisionals, continuations, continuations-in-part,
re-examinations, reissues, and all foreign equivalents of any of the foregoing
in whole or in part.

         1.4 "Becton Program Inventions" shall mean all Program Inventions made
or conceived by employees or others acting solely on behalf of Becton; provided,
however, that Becton Program Inventions shall not include Program Inventions
which constitute


                                      -2-




<PAGE>   60



improvements, enhancements, modifications or alterations of Arrays ("Array
Improvements") which are made or conceived by employees or others acting on
behalf of Becton. For purposes of this Agreement, Array Improvements shall be
deemed Nanogen Program Inventions.

        1.5 "Effective Date" shall mean October 1, 1997.

        1.6 "Field" shall mean in vitro nucleic acid-based diagnostic and
monitoring technology involving tests utilizing Arrays for the detection,
identification and/or determination of susceptibility/resistance of microbial
agents (i.e., bacteria, viruses, fungi and parasites), excluding, however, ***.
Notwithstanding the foregoing, the Field shall include the detection of *** for
a period which concludes on that date which is *** following the Effective Date
or *** following the first commercial introduction of Product, whichever shall
first occur.

        1.7 "Joint Program Inventions" shall mean all Program Inventions made or
conceived by employees or others acting on behalf of Becton jointly with
employees or others acting on behalf of Nanogen; provided, however, that Joint
Program Inventions shall not include: (a) *** which are made or conceived by
employees or others acting on behalf of Becton jointly with employees or others
acting on behalf of Nanogen, which ***, for purposes of this Agreement, ***, and
(b) *** which are made or conceived by employees or others acting on behalf of
Nanogen jointly with employees or others acting on behalf of Becton, which ***,
for purposes of this Agreement ***.


***CONFIDENTIAL MATERIAL REDACTED AND FILED SEPARATELY WITH THE COMMISSION.


                                      -3-
<PAGE>   61


        1.8 "Master Agreement" shall mean that certain Master Agreement dated as
of October 1, 1997 between Becton and Nanogen.

        1.9 "Nanogen Intellectual Property" shall mean and include all
patentable and unpatentable inventions, ideas, discoveries, improvements, design
rights, semiconductor mask works, works of authorship, trade secrets, know-how
and any equivalents thereof which are in existence as of the Effective Date or
thereafter, are necessary to make, have made, use or sell a Product and are
owned by Nanogen.

        1.10 "Nanogen Patent Rights" shall mean all United States patents and
patent applications owned by Nanogen which are in existence as of the Effective
Date or thereafter and which contain a claim necessary to make, have made, use
or sell a Product, including all divisionals, continuations,
continuations-in-part, re-examinations, reissues, and all foreign equivalents of
any of the foregoing in whole or in part.

        1.11 "Nanogen Program Inventions" shall mean all Program Inventions made
or conceived by employees or others acting solely on behalf of Nanogen;
provided, however, that Nanogen Program Inventions shall not include Program
Inventions which constitute improvements, enhancements, modifications or
alterations of SDA ("SDA Improvements") which are made or conceived by employees
or others acting on behalf of Nanogen. For purposes of this Agreement, SDA
Improvements shall be deemed Becton Program Inventions.

        1.12 "Partners" or "Partner" shall mean a partner in the Partnership.
The Partners are Becton and NanoVenture LLC, a Delaware limited liability
company.

        1.13 "Partnership Agreement" shall mean that certain General Partnership
Agreement dated as of October 1, 1997 between the Partners.



                                      -4-

<PAGE>   62

        1.14 "Partnership Management Committee" shall mean the Management
Committee of the Partnership (as defined in the Partnership Agreement).

        1.15 "Primary Filing Countries" shall mean the United States, Canada,
European Community Countries and Japan.

        1.16 "Prior R&D Agreement" shall mean that certain Collaborative
Research and Development Agreement dated as of May 5, 1997 between Becton and
Nanogen.

        1.17 "Product" shall mean an instrument/reagent system which employs or
embodies Program Inventions.

        1.18 "Program Inventions" shall mean and include all patentable and
unpatentable inventions, ideas, discoveries, improvements, design rights,
semiconductor mask works, works of authorship, trade secrets, know-how and any
equivalents thereof, and any patent applications or patents based thereon, made
or conceived during and as a result of the Research Program (including, without
limitation, Program Inventions as defined in the Prior R&D Agreement), all of
which shall be identified in Appendix A to this Agreement, which Appendix shall
be amended from time to time as warranted.

        1.19 "Reimbursable Costs" shall mean all direct and indirect costs
incurred by the Researching Party in performing its obligations under this
Agreement, which may include without limitation, as applicable:

        (i) salaries and wages,

        (ii) payroll taxes,

        (iii) contract labor,



                                      -5-
<PAGE>   63

        (iv) fringe benefits,

        (v) expenses incurred in occupying facilities (including leasehold
        improvements) and equipment-related expenses, excluding depreciation and
        amortization expenses,

        (vi) recruitment and relocation,

        (vii) communications expense,

        (viii) supplies,

        (ix) development and prototype materials,

        (x) freight and transportation,

        (xi) training and education,

        (xii) travel expenses,

        (xiii) data processing costs,

        (xiv) patent, trademark and license fees and filing, prosecution and
        maintenance expenses,

        (xv) insurance,

        (xvi) professional services,

        (xvii) depreciation and amortization of facilities (including leasehold
        improvements) and equipment,

        (xviii) a financing charge for capital acquisitions made by the
        Researching Party for use in performing work under this Agreement,

        (xix) outside purchased services,

        (xx) sales and use taxes (including such taxes applicable to the
        acquisition, use, transfer or deemed transfer of property by a
        Researching Party),

        (xxi) periodic lease and rental payments under capital or financing
        leases,



                                      -6-

<PAGE>   64

        (xxii) costs of applying for approvals, and fees payable to governmental
        agencies, including the United States Food and Drug Administration (the
        "FDA") and comparable foreign regulatory authorities, including expenses
        resulting from generation of chemical, toxicological, microbiological
        and pharmacological data and techniques, clinical data and product
        formulations and specifications,

        (xxiii) periodic and special reports, including reports to Partners, and

        (xxiv) costs of preparation, analysis and submission of post-marketing
        reports required by the FDA, including, without limitation, adverse
        reaction reports and annual reports.

        (b) In determining Reimbursable Costs, each Researching Party will
employ the following accounting policies:

        (i) Capital equipment, facilities and leasehold improvements will be
        assigned an estimated economic useful life and salvage value, if any,
        and depreciation and amortization will be computed using the
        straight-line method. Depreciation and amortization will be allocated to
        Reimbursable Costs under this Agreement directly or through overhead
        rates applied to direct labor expense.

        (ii) Total facilities expenses of each Researching Party, excluding
        leasehold improvement amortization allocated to specific functional
        areas and net of any sublease revenues, will be allocated to
        Reimbursable Costs under this Agreement based on the ratio of square
        footage utilized by or committed to use by direct and indirect personnel
        engaged in work under this Agreement to the total amount of utilized or
        committed square footage owned or leased by such Researching Party.

        (iii) General and administrative expenses of each Researching Party will
        be allocated to this Agreement directly or based on the ratio of total
        Reimbursable Costs to total operating expenses of such Researching
        Party, excluding (in both instances) general and administrative expenses
        subject to such allocation.

        (iv) All other indirect expenses not covered in paragraphs (i) through
        (iii) of this subparagraph 1.19(b) which are in support of the Research
        Program will be allocated to Reimbursable Costs under this Agreement
        through overhead rates applied to direct labor expense.



                                      -7-



<PAGE>   65



        (c) The term "capital acquisition" as used herein shall mean that
portion of capital equipment, facilities, leasehold improvements or other
property, whenever acquired by the Researching Party, which are capitalized on
the Researching Party's accounting records and which are either: (A) purchased
directly by the Researching Party; (B) financed by the Researching Party under a
conditional sale contract; (C) financed by the Researching Party through a
secured loan; or (D) assets constructed in-house by the Researching Party.
Assets acquired under capital or financing leases will not be considered capital
acquisitions for purposes of this section.

        (d) With respect to capital acquisitions financed by the Researching
Party with specific borrowing, the financing charge referred to above will be in
the amount and at the time of the actual financing costs incurred by the
Researching Party. With respect to capital acquisitions not financed by the
Researching Party with specific borrowing, the financing charge will be based on
the prime lending rate in effect from time to time at Citibank N.A., New York,
New York, plus two (2) percentage points, to the extent permitted by applicable
law, applied to the Researching Party's net book value. "Net book value" is
defined as the gross capital acquisition value excluding capital acquisitions
financed by the Researching Party with specific borrowing, less related
accumulated depreciation and amortization. The financing charge for each billing
period will be prorated to the extent depreciation or amortization of the
capital acquisitions has been allocated to work other than work under this
Agreement during such period. The financing charge will be calculated monthly
based on the net book value at the end of the preceding fiscal month.


                                      -8-




<PAGE>   66



          1.20 "Research Management Committee" shall mean a committee which
shall be responsible for administering and reviewing the Research Program. The
Research Management Committee shall consist of three (3) employees of Becton and
three (3) employees of Nanogen, at least one of whom from each company shall be
research director level or higher.

          1.21 "Research Milestone I" shall mean, with respect to either or both
of Project A and Project B as applicable, all items listed in the Research
Program to be completed by December 31, 1997.

          1.22 "Research Milestone II" shall mean, with respect to either or
both of Project A and Project B as applicable, all items listed in the Research
Program to be completed by June 30, 1998.

          1.23 "Researching Party" shall mean Becton and Nanogen, jointly or
severally, as the context shall require.

          1.24 "Research Program" shall mean the cumulative endeavors of the
parties to produce Products within the Field for the Partnership in accordance
with the specifications, timetables, milestones, reports and deliverables, as
set forth in Appendix B hereto, as it may be amended from time to time.

          1.25 "Total Available Funds" shall mean the aggregate sums of cash
contributed to the Partnership by the Partners pursuant to Paragraph 8.1 of the
Partnership Agreement.




                                      -9-




<PAGE>   67



          2.  RESEARCH PROGRAM

          2.1 Each of Becton and Nanogen shall use reasonable efforts to perform
their respective activities in accordance with the Research Program.

          2.2 Each of Becton and Nanogen shall promptly notify the other party,
in writing, through the Research Management Committee, of the existence of any
new Program Inventions.

          2.3 The Research Management Committee shall meet from time to time,
but at least once every three (3) months during the term of this Agreement, at a
mutually agreed location, to: (a) review progress and ongoing resource
allocation and budgeting matters of the Research Program; (b) amend the Research
Program as agreed by the parties; (c) disclose Program Inventions which have not
previously been disclosed in accordance with Paragraph 2.2; and (d) review the
status of patent filings with respect to Program Inventions and, if necessary in
view of such review, propose amendments to Appendix A of this Agreement. In
order to facilitate the disclosure of Program Inventions and the review of the
status of patent filings with respect to Program Inventions, patent attorneys
for Becton and Nanogen should participate in all such meetings.

          2.4 Within five (5) business days following each meeting pursuant to
Paragraph 2.3, the Research Management Committee shall cause to be prepared a
written summary of such meeting, which summary shall include, at a minimum: (a)
a list of all Program Inventions which have come into existence since the
Effective Date or since the previous meeting, whichever is applicable; (b) all
patent filings with respect to Program Inventions since the Effective Date or
since the previous meeting, whichever is applicable;


                                      -10-




<PAGE>   68



and (c) a report regarding the progress of the Research Program. Such written
summary shall be signed by the patent attorneys for each party to evidence their
respective party's agreement regarding the accuracy of such written summary.

          2.5 The Partners and each Researching Party may, upon reasonable
notice during normal business hours, (a) visit the facilities where the Research
Program is being conducted to the extent relating to such Research Program, (b)
consult informally, during such visits and by telephone, with personnel of the
other Researching Party performing work on the Research Program, and (c) with
the other Researching Party's prior approval, which approval shall not be
unreasonably withheld, visit the sites of any tests or experiments being
conducted by such other Researching Party in connection with the Research
Program, but only to the extent in each case as such trials or other experiments
relate to the Research Program. On such visits an employee of the Researching
Party conducting the research or development activities shall accompany the
employee(s) of the visiting Researching Party. If requested by the visiting
Researching Party, the Researching Party shall cause appropriate individuals
working on the Research Program to be available for meetings at the location of
the facilities where such individuals are employed at times reasonably
convenient to the party responding to such request. All information revealed to
representatives of the Partners and/or the Researching Parties during the visits
and consultations provided for in this Paragraph 2.5 shall be treated as
confidential information in accordance with Paragraph 5 of this Agreement.



                                      -11-




<PAGE>   69



        3.  PAYMENT

        3.1 The Partnership shall pay a research and development fee equal to
each Researching Party's Reimbursable Costs incurred in performing its
obligations under this Agreement (the "Fee"). The Fee in the aggregate for both
Researching Parties shall not exceed Total Available Funds. Neither Researching
Party makes any warranty of any kind that the Fee will be sufficient to complete
the Research Program. The Fee shall be payable by the Partnership to each
Researching Party as follows:

        (a) The initial annual budget for the Research Program shall be prepared
by the Research Management Committee within forty-five (45) days following the
Effective Date, shall be approved by the respective parties and shall be
attached hereto as Appendix C. Annually thereafter during the term hereof, the
Research Management Committee shall develop a budget for the Research Program,
including anticipated quarterly expenditures by each Researching Party. The
Research Management Committee shall submit each such subsequent budget to the
Partnership Management Committee for its review and approval at least forty-five
(45) days prior to commencement of the next annual period. The Partnership
Management Committee shall review such budget and inform the Research Management
Committee of its determination with respect to same within thirty (30) days
following its receipt of same. If the budget is not approved, the Research
Management Committee shall confer with the Partnership Management Committee to
attempt to develop a mutually acceptable budget. If the parties are unable to do
so, the disagreement shall be resolved in accordance with the procedures set
forth in Article V of the Partnership Agreement. Until


                                      -12-

           


<PAGE>   70



such time as a budget is established, the obligation of the Researching Parties
for periods covered by the budget shall be postponed.

          (b) The Fee shall be payable to each Researching Party in quarterly
installments commencing on October 1, 1997. Each quarterly installment shall be
due not later than five (5) business days following the first day of each
quarter. All installments shall be based upon an estimate of the Reimbursable
Costs expected to be incurred by each Researching Party during its next
quarterly period beginning on such date, up to a maximum of such Researching
Party's budgeted amount for such quarter. Such estimate shall be set forth in an
invoice prepared by each Researching Party in reasonable detail, signed by a
duly authorized officer of each Researching Party and submitted to the
Partnership at least twenty (20) days prior to the beginning of the quarterly
period with respect to which such payment is to be made. Each such invoice shall
be due and payable in full by the Partnership prior to the beginning of such
quarterly period. Beginning with the second invoice under this Agreement, such
invoice shall include a reconciliation and adjustment for the period covered by
the preceding invoice to reflect any difference between actual Reimbursable
Costs incurred by each Researching Party and estimated Reimbursable Costs for
such period, up to a maximum of such Researching Party's budgeted amount for
such quarter. Any amounts in excess of the budgeted amount shall be subject to
the review and approval of the Partnership Management Committee.

          3.2 If the Partnership fails to make prompt and timely payment, the
affected Researching Party may give written notice thereof, and unless the
Partnership within fifteen (15) days following receipt of such notice makes such
payment, such Researching Party may


                                      -13-




<PAGE>   71



at any time thereafter until the Partnership makes such payment suspend the
research and development services under this Agreement on written notice to the
Partnership.

          4.  REPORTS AND RECORDS

          4.1 Each Researching Party shall provide to the Partnership within
forty-five (45) days following the end of each of such Researching Party's
quarterly periods beginning with the end of the first period on December 31,
1997, a report in such reasonable detail as the Partnership may request setting
forth:

          (a) the Reimbursable Costs during such period;

          (b) the work performed by such Researching Party during such period;
and

          (c) the status of the research and development of the Products at the
end of the period.

          4.2 Each Researching Party shall keep and maintain, in accordance with
generally accepted accounting principles and practices, proper and complete
records and books of account documenting all Reimbursable Costs. Each
Researching Party agrees to permit nationally recognized certified public
accountants retained by the Partnership reasonable access to such records at
least annually to verify the Reimbursable Costs billed by such Researching Party
to the Partnership; and such Researching Party shall provide annually to the
Partnership a certification by nationally recognized certified public
accountants as to the Reimbursable Costs billed to the Partnership in that year.
The Partnership will keep confidential, and will not disclose to any third
party, except such disclosures as may be required by law, without the prior
written consent of the Researching Party, information in


                                      -14-

             


<PAGE>   72



statements delivered to the Partnership or obtained by the Partnership through
access of its independent certified public accounting firm to the books and
records of such Researching Party.

        5. CONFIDENTIALITY AND NON-DISCLOSURE

        That certain Confidentiality Agreement effective as of February 6, 1997
between Becton and Nanogen, as amended (the "Confidentiality Agreement"), shall
remain in full force and effect, except that the terms "Becton Information",
"Nanogen Information" and "Information" shall include information provided under
this Agreement, the Partnership Agreement, the Prior R&D Agreement and the
Administrative Services Agreement dated as of October 1, 1997 between Becton and
the Partnership (the "Services Agreement"), and the term "Stated Purpose" shall
include the activities conducted for the Partnership contemplated by this
Agreement, the Partnership Agreement, the Prior R&D Agreement and the Services
Agreement. The Partnership also hereby agrees to be bound by the terms and
conditions of the Confidentiality Agreement as if a party thereto.

        6. INTELLECTUAL PROPERTY LICENSES

        6.1 (a) Becton hereby grants (i) solely during the existence of the
Partnership, to the Partnership, a worldwide, royalty-free, nonexclusive license
in and to Becton Intellectual Property and Becton Patent Rights, solely to make,
have made, use, offer to sell, sell and import Products in the Field, (ii)
solely during the term of this Agreement to Nanogen, a worldwide, royalty-free,
nonexclusive license in and to Becton Intellectual Property and Becton


                                      -15-




<PAGE>   73



Patent Rights, solely to use in research and development activities of the
Research Program under this Agreement and (iii) solely in the event of a buyout
pursuant to Section 7.8 of the Partnership Agreement, to the Purchasing Party
(as defined in Section 7.8(c)), a worldwide, royalty-free, nonexclusive license
in and to Becton Intellectual Property and Becton Patent Rights, solely to make,
have made, use, offer to sell, sell and import Products in the Field.

        (b) Nanogen hereby grants (i) solely during the existence of the
Partnership, to the Partnership, a worldwide, royalty-free, nonexclusive license
in and to Nanogen Intellectual Property and Nanogen Patent Rights, solely to
make, have made, use, offer to sell, sell and import Products in the Field, (ii)
solely during the term of this Agreement, to Becton, a worldwide, royalty-free,
nonexclusive license in and to Nanogen Intellectual Property and Nanogen Patent
Rights, solely to use in research and development activities of the Research
Program under this Agreement and (iii) solely in the event of a buyout pursuant
to Section 7.8 of the Partnership Agreement, to the Purchasing Party (as defined
in Section 7.8(c)), a worldwide, royalty-free, nonexclusive license in and to
Nanogen Intellectual Property and Nanogen Patent Rights, solely to make, have
made, use, offer to sell, sell and import Products in the Field.

        (c) The Partnership hereby grants: (i) to Becton, a perpetual,
worldwide, royalty-free, exclusive license in and to Becton Program Inventions
for all applications other than to make, have made, use, offer to sell, sell and
import Products in the Field, (ii) to Nanogen, a perpetual, worldwide,
royalty-free, exclusive license in and to Nanogen Program Inventions for all
applications other than to make, have made, use, offer to sell, sell and import
Products in the Field; and (iii) to Becton and Nanogen, jointly, perpetual,
worldwide,


                                      -16-




<PAGE>   74



royalty-free, co-exclusive licenses in and to Joint Program Inventions for all
applications other than to make, have made, use, offer to sell, sell and import
Products in the Field.

        6.2 The licenses granted in accordance with Paragraphs 6.1(a) and (b) do
not include a right to grant sublicenses. The licenses granted by the
Partnership to Becton and Nanogen in accordance with Paragraphs 6.1(c) include a
right to grant sublicenses.

        6.3. The Partnership shall use commercially reasonable efforts to
exploit Products in the Field.

        6.4 The Partnership shall mark all Products manufactured or sold by it
under this Agreement in accordance with all applicable laws relating to patent
marking, which shall contain the following marking, as applicable,: "Licensed
from Becton, Dickinson and Company" or "Licensed from Nanogen, Inc."

        6.5 The Partnership shall comply with all applicable laws of the United
States and any other appropriate jurisdiction and the regulations promulgated
thereunder, in the development, manufacture, distribution, sales and marketing
of Products.

        6.6 In the event that any substantial and continuing infringement of any
of the Becton Patent Rights or Nanogen Patent Rights licensed hereunder comes to
the attention of any party hereto, such party shall promptly notify the
Partnership Management Committee, which Committee will determine an appropriate
action in accordance with its authority.

        7. INTELLECTUAL PROPERTY AND PATENT RIGHTS

        7.1 Subject to the licenses granted by the Partnership to Becton and
Nanogen, individually and jointly, in Paragraph 6.1(c), the entire right, title
and interest in all Program


                                      -17-




<PAGE>   75



Inventions shall be owned solely by the Partnership. Becton hereby assigns its
entire right, title and interest in all Becton Program Inventions and Joint
Program Inventions to the Partnership, and Nanogen hereby assigns its entire
right, title and interest in all Nanogen Program Inventions and Joint Program
Inventions to the Partnership.

           7.2 Each Researching Party promptly shall disclose to the other
Researching Party and the Partnership the making, conception or reduction to
practice of Program Inventions by employees or others acting on behalf of such
party. Each of Nanogen and Becton hereby represents and warrants that all
employees and others acting on its respective behalf in performing its
obligations under this Agreement shall be obligated under a binding written
agreement to assign to it, or as it shall direct, all Program Inventions made or
developed by such employees or others.

           7.3 Promptly following any disclosure of Program Inventions pursuant
to Paragraph 2.2 and Paragraph 7.2, the Research Management Committee, in
consultation with patent attorneys for Becton and Nanogen, shall discuss and
determine, in good faith, whether patent applications should be prepared and
filed for such disclosed Program Inventions.

           7.4 If patent applications are to be prepared and filed pursuant to
Paragraph 7.3, then the Research Management Committee shall discuss and
determine, in good faith, for each of such Program Inventions, which of the
parties shall be responsible for the preparation, filing, prosecution and
maintenance of such patent applications in the Primary Filing Countries. Each of
such patent applications shall become part of the Program Inventions, and
Appendix A shall be amended accordingly to evidence such Program Inventions.


                                      -18-



<PAGE>   76



        7.5 (1) If the Research Management Committee determines that a
particular patent application be filed in a country or countries in addition to
the Primary Filing Countries, then the Research Management Committee shall
determine which Researching Party shall be responsible for the filing,
prosecution and maintenance of such patent application, and such patent
application shall be part of the Program Inventions.

            (2) If the Research Management Committee determines not to file a
particular patent application in a country or countries in addition to the
Primary Filing Countries, either Researching Party, alone, after written waiver
by the other Researching Party, may file such particular patent application in
such country or countries and shall pay, without right to reimbursement thereof,
all costs and expenses for filing, prosecution and maintenance of patent
application filed in such country or countries, and notwithstanding the
provisions of Paragraph 6.1, that Researching Party shall own, exclusively, all
right, title and interest in such patent application.

            (3) If the other Researching Party of Paragraph 7.5(b) does not
provide such written waiver, then any such particular patent application shall
be treated as if the Research Management Committee had made a declaration to
file the particular patent application in a country or countries in addition to
the Primary Filing Countries in accordance with Paragraph 7.5(a).

        7.6 Each Researching Party shall keep the Research Management Committee
currently informed of the filing and progress of all material aspects of the
prosecution of all such patent applications and of the issuance of patents, and
shall consult with the Research


                                      -19-




<PAGE>   77



Management Committee concerning any decisions which would affect the scope of
any issued claims and other prosecutorial details, including the potential
abandonment of any application.

           7.7 Upon request, each Researching Party shall execute and deliver to
the other Researching Party or the Partnership, as applicable, all descriptions,
applications, assignments and other documents and instruments as are necessary
or proper to carry out the provisions of Paragraphs 7.1, 7.2, 7.3, 7.4, 7.5 and
7.6, without further compensation except as otherwise provided in Paragraph
1.19, and the Researching Parties shall cooperate with and assist each other or
their nominees and the Partnership in all reasonable ways and at all reasonable
times, including, but not limited to, testifying in all legal proceedings,
signing all lawful papers and in general performing all lawful acts reasonable,
necessary or proper, to aid the other Researching Party or the Partnership, as
applicable, in obtaining, maintaining, defending and enforcing all lawful
patent, copyright, trade secret, know-how and the like in the Primary Filing
Countries and elsewhere.

           7.8 Except as otherwise provided in this Agreement, under no
circumstances shall either Researching Party or the Partnership, as a result of
this Agreement, obtain any ownership interest or other right in any technology,
know-how, trade secrets, patents, pending patent applications or products of the
other Researching Party, including items owned, controlled or developed by the
other, or transferred by the other to such Researching Party at any time
pursuant to this Agreement. It is understood and agreed by the parties hereto
that this Agreement does not grant to either Researching Party or to the
Partnership any license or other right, other than the licenses granted in
Paragraph 6.1 and the assignments granted in Paragraph 7.1.



                                      -20-




<PAGE>   78



        8. TERM AND TERMINATION

        8.1 This Agreement will terminate upon the earliest of:

        (a) the expenditure or incurrence by both Researching Parties pursuant
to this Agreement of Reimbursable Costs of an aggregate amount equal to Total
Available Funds;

        (b) the institution of voluntary or involuntary proceedings by or
against either Researching Party or the Partnership in bankruptcy, or under any
insolvency law, or for corporate reorganization, the appointment of a receiver,
or petition for the dissolution of such Researching Party or the Partnership for
the benefit of creditors;

        (c) the date the Partnership gives notice to both Researching Parties of
its decision to terminate this Agreement;

        (d) the date the Partnership terminates;

        (e) the date mutually agreed to in writing for termination by both
Researching Parties and the Partnership;

        (f) December 31, 1997 if Research Milestone I is not successfully
completed for either Project A or Project B;

        (g) June 30, 1998 if Research Milestone II is not successfully completed
for either Project A or Project B;

        (h) the date of the closing of a buyout in accordance with Section 7.8
of the Partnership Agreement; or

        (i) as otherwise provided in this Agreement.

        8.2 This Agreement may also be terminated by either Researching Party or
the Partnership upon default or breach of a material obligation or condition by
any of the other




                                      -21-




<PAGE>   79



parties, such termination being effective sixty (60) days after receipt by the
alleged defaulting or breaching party of written notice of such termination
under this Paragraph specifying the default or breach; provided, however, that
if the default or breach is cured or shown to be nonexistent within the sixty
(60) day period after receipt of written notice, the notice shall be deemed
automatically withdrawn and of no effect.

        8.3 Termination of this Agreement alone shall not affect (i) the
obligation of the Partnership under Article 3 to pay a Fee to a Researching
Party for Reimbursable Costs incurred prior to the date of such termination or
(ii) any of the rights or obligations provided for in Articles 5, 6 and 7.

        8.4 All records required to be maintained pursuant to Paragraph 4.2
shall be retained for a period of at least five (5) years following the
termination of this Agreement.

        9. REPRESENTATIONS AND WARRANTIES

        9.1 Becton hereby represents and warrants to Nanogen and the Partnership
that it has full authority and power to enter into this Agreement, that it has
secured any and all necessary approvals, permits or consents deemed necessary or
advisable for the consummation of the transactions contemplated hereby and that,
upon execution by Becton, Nanogen and the Partnership, this Agreement shall
immediately be a valid and binding obligation of Becton, enforceable in
accordance with its terms.

        9.2 Nanogen hereby represents and warrants to Becton and the Partnership
that it has full authority and power to enter into this Agreement, that it has
secured any and all necessary approvals, permits or consents deemed necessary or
advisable for the consummation


                                      -22-




<PAGE>   80



of the transactions contemplated hereby and that, upon execution by Becton,
Nanogen and the Partnership, this Agreement shall immediately be a valid and
binding obligation of Nanogen enforceable in accordance with its terms.

           9.3 The Partnership hereby represents and warrants to Becton and
Nanogen that it has full authority and power to enter into this Agreement, that
it has secured any and all necessary approvals, permits or consents deemed
necessary or advisable for the consummation of the transactions contemplated
hereby and that, upon execution by Becton, Nanogen and the Partnership, this
Agreement shall immediately be a valid and binding obligation of the
Partnership, enforceable in accordance with its terms.

           9.4 Becton hereby represents and warrants to Nanogen and the
Partnership that: (a) it is the owner of the entire right, title and interest to
the Becton Intellectual Property and Becton Patent Rights, and (b) to Becton's
best knowledge, the Becton Patent Rights or the Becton Intellectual Property has
not infringed, and is not now infringing, any third party rights and Becton has
not received any notice of infringement from any third party respecting the
Becton Patent Rights or the Becton Intellectual Property.

           9.5 Nanogen hereby represents and warrants to Becton and the
Partnership that: (a) it is the owner of the entire right, title and interest to
the Nanogen Intellectual Property and the Nanogen Patent Rights and (b) to
Nanogen's best knowledge, the Nanogen Patent Rights or the Nanogen Intellectual
Property has not infringed, and is not now infringing, any third party rights
and Nanogen has not received any notice of infringement from any third party
respecting the Nanogen Patent Rights or the Nanogen Intellectual Property.



                                      -23-



<PAGE>   81



        10. DISCLAIMERS

        10.1 THE RESEARCHING PARTIES EACH HEREBY DISCLAIM ANY AND ALL
REPRESENTATIONS AND WARRANTIES, EXPRESS OR IMPLIED, WITH RESPECT TO THEIR
RESPECTIVE RESEARCH AND DEVELOPMENT EFFORTS HEREUNDER, INCLUDING, WITHOUT
LIMITATION, (A) WHETHER ANY PRODUCT CAN BE SUCCESSFULLY DEVELOPED BY EITHER OF
THE RESEARCHING PARTIES, (B) WHETHER THE PRODUCTS AS DEVELOPED BY EITHER OF THE
RESEARCHING PARTIES HEREUNDER CAN BE COMMERCIALLY MARKETED, (C) THE ACCURACY,
PERFORMANCE, UTILITY, RELIABILITY, TECHNOLOGICAL OR COMMERCIAL VALUE,
COMPREHENSIVENESS, MERCHANTABILITY OR SUITABILITY FOR ANY PARTICULAR PURPOSE
WHATSOEVER OF ANY PRODUCT, AND (D) WHETHER ANY PRODUCTS MANUFACTURED WILL NOT
INFRINGE ANY THIRD-PARTY PATENT, COPYRIGHT OR SIMILAR RIGHT.

        11. INSURANCE

        The Researching Parties shall each, at all times during the term of this
Agreement, carry and maintain such insurance as each believes to be commercially
reasonable against risks from actions contemplated under this Agreement. Such
insurance shall be with insurers of recognized responsibility and may be carried
under blanket policies maintained by each of the Researching Parties. The
Partnership shall, to the extent reasonably possible, be included as an
additional named insured on all policies of such insurance.



                                      -24-




<PAGE>   82



           12.       NOTICES

           Any notice, request, demand, waiver, consent, approval, or other
communication which is required or permitted hereunder shall be in writing and
shall be deemed given only if delivered personally, by facsimile (upon receipt
of appropriate written confirmation) or sent by registered or certified mail,
return receipt requested, or by overnight courier service, postage prepaid as
follows:
                               If to Nanogen:

                               Nanogen, Inc.
                               10398 Pacific Center Court
                               San Diego, California 92121
                               Attn: Chief Executive Officer
                               facsimile - (619) 546-7717

                               with a copy to:

                               Nanogen, Inc.
                               10398 Pacific Center Court
                               San Diego, California  92121
                               Attn:  General Counsel
                               facsimile - (619) 546-7717

                               and if to Becton:

                               Becton Dickinson Microbiology Systems
                               7 Loveton Circle
                               Sparks, Maryland 21152
                               Attn:  President
                               facsimile - (410) 316-4991

                               with a copy to:

                               Becton, Dickinson and Company
                               1 Becton Drive
                               Franklin Lakes, New Jersey 07417
                               Attn:  Chief Patent and Licensing Counsel
                               facsimile - (201) 848-9228


                                      -25-

                                    


<PAGE>   83




                               If to the Partnership:

                               The Nanogen/Becton Dickinson Partnership,
                               a Delaware general partnership
                               c/o Nanogen, Inc.
                               10398 Pacific Center Court
                               San Diego, CA 92121
                               Attn:  General Counsel
                               facsimile 619-546-7717

                               with a copy to:

                               Becton Dickinson Microbiology Systems
                               7 Loveton Circle
                               Sparks, Maryland 21152
                               Attn:  President
                               facsimile - (410) 316-4991


or to such other address as the addressee may have specified in a notice duly
given to the sender as provided herein. Such notice, request, demand, waiver,
consent, approval or other communication will be deemed to have been given as of
the date so received (in case of personal delivery, facsimile or overnight
courier service delivery) or upon refusal to accept delivery thereof.

        13. DISPUTE RESOLUTION

        13.1 Any dispute arising out of or relating to this Agreement which is
not resolved by the Research Management Committee or is not within the purview
of the Research Management Committee shall be governed by the terms and
provisions of Article V of the Master Agreement.



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<PAGE>   84



           14.       MISCELLANEOUS

           14.1 This Agreement, the Master Agreement, the Partnership Agreement,
the Administrative Services Agreement and the Confidentiality Agreement together
constitute the entire understanding among the parties with respect to the
subject matter hereof and supersede and replace all prior agreements,
understandings, writings and discussions between the parties relating to said
subject matter, including, without limitation, the Prior R&D Agreement, which
Prior R&D Agreement is hereby terminated immediately and of no further force and
effect. In the event of any conflict between any term or provision of this
Agreement and any of the foregoing agreements, the Master Agreement shall
control.
           14.2 This Agreement may be amended only by a written instrument
executed by the parties hereto. The failure of any party at any time or times to
require performance of any provision hereof shall in no manner affect its rights
at a later time to enforce the same. No waiver by any party of any condition or
term in any one or more instances shall be construed as a further or continuing
waiver of such condition or term or any other condition or term.

           14.3 The terms and provisions contained in this Agreement are for the
sole benefit of the parties and their successors and assigns, and they shall not
be construed as conferring and are not intended to confer any rights on any
other persons.

           14.4 Any delays in or failure of performance by any party under this
Agreement shall not be considered a breach of this Agreement if and to the
extent caused by occurrences beyond the reasonable control of the party
affected, including but not limited to acts of God; acts, regulations, or laws
of any government; strikes or other considered acts of workers; fires; floods;


                                      -27-




<PAGE>   85



explosions; riots; wars; rebellion; and sabotage; and any time for performance
hereunder shall be extended by the actual time of delay caused by such
occurrence.

           14.5 This Agreement shall not be assignable by either Researching
Party, nor shall any of its obligations hereunder be delegated to a third party,
without the prior written consent of the other Researching Party and the
Partnership, which consent shall not be unreasonably withheld or delayed. In the
event that the other Researching Party or the Partnership does not respond to a
request from a Researching Party for consent to an assignment or delegation
within fifteen (15) days following written notice requesting such consent, such
Researching Party's or the Partnership's consent shall be deemed to be granted.
In addition, a condition to any assignment or delegation hereunder shall be that
the successor in interest expressly agrees in writing to assume the assigning or
delegating party's obligations hereunder. All of the terms and provisions of
this Agreement shall be binding upon and inure to the benefit of and be
enforceable by the respective permitted successors and assigns. No such
assignment shall release the assigning party from its obligations hereunder.
Notwithstanding the foregoing, the consent of the other Researching Party and
the Partnership shall not be required in connection with a merger involving
either Becton or Nanogen or with respect to an assignment of this Agreement in
connection with, as the case may be, the acquisition, sale of all or
substantially all of the assets of Becton or Nanogen, or a change of control or
similar transaction.

           14.6 If any provision(s) of this Agreement are or become invalid, or
are ruled illegal by any court of competent jurisdiction, or are deemed
unenforceable under then current applicable law from time to time in effect
during the term hereof, it is the intention of the parties hereto that the
remainder of this Agreement shall not be affected thereby. It is further the


                                      -28-



<PAGE>   86



intention of the parties that in lieu of each such provision which is invalid,
illegal, or unenforceable, there be substituted or added as part of this
Agreement, a provision which shall be as similar as possible in economic and
business objectives as intended by the parties to such invalid, illegal, or
unenforceable provision, but which shall be valid, legal, and enforceable, and
shall be mutually agreed by the parties.

           14.7 This Agreement shall be governed by and construed in accordance
with the laws of the State of Delaware without regard to its choice of laws
principles. This Agreement shall be construed and interpreted without
application of any principle or rule to the effect that ambiguities are to be
construed against the party responsible for drafting the agreement. The headings
contained herein are for reference purposes only and shall not in any way affect
the meaning of this Agreement.

           14.8 This Agreement may be executed in any number of counterparts,
each of which shall be deemed an original, but all of which together shall
constitute one instrument.

           14.9 (a) During the term of this Agreement, the Partnership, Nanogen
and Becton each acknowledge each party's interest in publishing certain of its
results to obtain recognition within the scientific community and to advance the
state of scientific knowledge. Each party also recognizes the mutual interest in
obtaining valid patent protection and protecting business interests.
Consequently, each party, its employees or consultants wishing to make a
publication (including any oral disclosure made without obligation of
confidentiality) relating to work performed by such party as part of the
Research Program (the "Publishing Party") shall transmit to the Research
Management Committee a copy of the proposed written publication at least
forty-five (45) days prior to submission for publication, or an outline of such
oral disclosure


                                      -29-




<PAGE>   87



at least fifteen (15) days prior to presentation. The Research Management
Committee shall have the right (i) to propose modifications to the publication
for patent reasons and (ii) to request a reasonable delay in publication in
order to protect patentable information.

        (b) If the Research Management Committee requests such a delay, the
Publishing Party shall delay submission or presentation of the publication for a
period of ninety (90) days to enable patent applications protecting each party's
rights in such information to be filed in accordance with Paragraph 7 above.
Upon the expiration of forty-five (45) days, in the case of proposed written
disclosures, or fifteen (15) days, in the case of proposed oral disclosures,
from transmission to the Research Management Committee, the Publishing Party
shall be free to proceed with the written publication or the presentation,
respectively, unless the Research Management Committee has requested the delay
described above.

                         [SIGNATURES ON FOLLOWING PAGE]



                                      -30-

<PAGE>   88



           IN WITNESS WHEREOF, the parties have executed this Agreement through
duly authorized representatives as of the Effective Date.

NANOGEN, INC.                                  BECTON, DICKINSON AND COMPANY



By: /s/ Howard C. Birndorf                     By: /s/ Vincent A. Forlenza
    ------------------------------------           -----------------------------
           Howard C. Birndorf                          Vincent A. Forlenza
           Chairman and Chief                          President - Worldwide
           Executive Officer                           Microbiology Systems


THE NANOGEN/BECTON DICKINSON PARTNERSHIP,
A DELAWARE GENERAL PARTNERSHIP

By   Becton Dickinson Venture LLC
     General Partner

By: /s/ Vincent A. Forlenza
    -----------------------------------------
    Name: Vincent A. Forlenza
    Title: President Becton Dickinson
           Microbiology Systems


By   NanoVenture LLC
     General Partner

By: /s/ Howard C. Birndorf
    -----------------------------------------
    Name:  Howard C. Birndorf
    Title: Manager



                                           -31-
                                          


<PAGE>   89


                                   APPENDIX A

                               PROGRAM INVENTIONS
<PAGE>   90
                                 [NANOGEN LOGO]

                           INVENTION DISCLOSURE FORM

SUBMITTED BY: ***

              IF ADDITIONAL SPACE IS REQUIRED, USE A SUPPLEMENTAL
              SHEET, AND SIGN, DATE AND REFER TO IT IN THIS FORM.

1.   NAME(S) of INVENTOR(S): ***

2.   SHORT TITLE: ***.

3.   CIRCUMSTANCES LEADING TO THE IDEA CONSTITUTING THE INVENTION: (e.g.
     problems and difficulties in present practice giving rise to the idea).

                                      ***

4.   BRIEF SUMMARY OF THE INVENTION (TECHNICAL ABSTRACT), including a listing
     of the key technical achievements of the invention:

                                      ***

5.   KEY ISSUES REGARDING PATENTABILITY:

     A.   IS THE INVENTION NEW (NOVEL)? ***

     B.   IS THE INVENTION NON-OBVIOUS? ***


                                       1

*** CONFIDENTIAL MATERIAL REDACTED AND FILED SEPARATELY WITH THE COMMISSION.
<PAGE>   91
                                      ***

     6.   DETAILED DESCRIPTION OF THE INVENTION (If a MACHINE, give structure,
          mode of operation and results; if an ARTICLE, give details of
          structure and use; if a METHOD or PROCESS, give steps, conditions and
          results; and if a COMPOSITION OF MATTER give components, proportions
          and synthesis.  Please attach sketches, blueprints or photographs).(1)
          THE DESCRIPTION MUST (1) ENABLE ONE SKILLED IN THE ART TO MAKE AND USE
          YOUR INVENTION AND (2) DESCRIBE WHAT YOU CURRENTLY BELIEVE TO BE THE
          BEST MODE FOR PRACTICING YOUR INVENTION.

                                      ***




                                       2

*** CONFIDENTIAL MATERIAL REDACTED AND FILED SEPARATELY WITH THE COMMISSION.
<PAGE>   92

<PAGE>   93
                                      ***

1.   IDENTIFY ALL RELEVANT PRIOR WORK (including of yourself or coworkers) of
     which you are aware.  Briefly describe the relevance to your invention, and
     indicate how your invention differs from the prior work.  Please provide
     copies of any printed publications with this invention disclosure form.

2.
     ***
     ***

3.   CONCEPTION DATE (day, month and year; and specify records relied on).

     ---------------------------------------------------------------------

     ---------------------------------------------------------------------

4.   EARLIEST DISCLOSURE TO OTHERS (STATE where, when and to whom; specify
     records relied on);
     ---------------------------------------------------------------------

5.   DATE OF EARLIEST SKETCH OR DRAWING (Give drawing number):

     ---------------------------------------------------------------------

     ---------------------------------------------------------------------

6.   EARLIEST DATE INVENTION WAS OPERATED OR PRODUCED (State when, where,
     describe tests in detail, and give names of witnesses present during
     operation or tests).


     STATE THE DATE OF ACTUAL OR EXPECTED FIRST PUBLIC USE, DISCLOSURE OR SALE
     (Including offers for sale):

     Unknown


7.   WAS INVENTION DEVELOPED USING FUNDS FROM THE FEDERAL GOVERNMENT?
     _____ IF SO, please identify which contracts:
     No

8.   IS THIS INVENTION RELATED TO ANY OTHER INVENTION FOR WHICH ANY APPLICATION
     OR OTHER INVENTION DISCLOSURE FORM HAS BEEN SUBMITTED? If so, please
     identify.

     Not that I am aware

                                      ***

                                       3

*** CONFIDENTIAL MATERIAL REDACTED AND FILED SEPARATELY WITH THE COMMISSION.
<PAGE>   94

                                    Nanogen

                           INVENTION DISCLOSURE FORM

SUBMITTED BY: ***

              IF ADDITIONAL SPACE IS REQUIRED, USE A SUPPLEMENTAL
              SHEET, AND SIGN, DATE AND REFER TO IT IN THIS FORM.

1.   NAME(S) OF INVENTOR(S): ***

2.   SHORT TITLE: ***

3.   CIRCUMSTANCES LEADING TO THE IDEA CONSTITUTING THE INVENTION: (e.g.
     problems and difficulties in present practice giving rise to the idea).

                                      ***

4.   BRIEF SUMMARY OF THE INVENTION (TECHNICAL ABSTRACT), including a listing of
     the key technical achievements of the invention:

                                      ***

5.   KEY ISSUES REGARDING PATENTABILITY:

     A. IS THE INVENTION NEW (NOVEL)?

                                      ***

                                       1


*** CONFIDENTIAL MATERIAL REDACTED AND FILED SEPARATELY WITH THE COMMISSION.
<PAGE>   95
6.   DETAILED DESCRIPTION OF THE INVENTION (If a MACHINE, give structure, mode
     of operation and results; if an ARTICLE, give details of structure and use;
     if a METHOD or PROCESS, give steps, conditions and results; and if a
     COMPOSITION OF MATTER give components, proportions and synthesis. Please
     attach sketches, blueprints or photographs).(1) THE DESCRIPTION MUST (1)
     ENABLE ONE SKILLED IN THE ART TO MAKE AND USE YOUR INVENTION AND (2)
     DESCRIBE WHAT YOU CURRENTLY BELIEVE TO BE THE BEST MODE FOR PRACTICING YOUR
     INVENTION

                                      ***


---------

                                       2

*** CONFIDENTIAL MATERIAL REDACTED AND FILED SEPARATELY WITH THE COMMISSION.
<PAGE>   96


                                    [CHART]

                                      ***




*** CONFIDENTIAL MATERIAL REDACTED AND FILED SEPARATELY WITH THE COMMISSION.


<PAGE>   97
                                    [CHART]

                                      ***







*** CONFIDENTIAL MATERIAL REDACTED AND FILED SEPARATELY WITH THE COMMISSION.
<PAGE>   98
1.   IDENTIFY ALL RELEVANT PRIOR WORK (including of yourself or coworkers) of
     which you are aware.  Briefly describe the relevance to your invention,
     and indicate how your invention differs from the prior work. Please provide
     copies of any printed publications with this invention disclosure form.

2.   ***

3.   CONCEPTION DATE (day, month and year; and specify records relied on).
     Approximately July 24, 1997 (see above)

     EARLIEST DISCLOSURE TO OTHERS (State where, when and to whom; specify
     records relied on):

     None

4.   DATE OF EARLIEST SKETCH OR DRAWING (Give drawing number):

     --------------------------------------------------------------------
     --------------------------------------------------------------------

5.   EARLIEST DATE INVENTION WAS OPERATED OR PRODUCED (State when, where,
     describe tests in detail, and give names of witnesses present during
     operation or tests).

     STATE THE DATE OF ACTUAL OR EXPECTED FIRST PUBLIC USE, DISCLOSURE OR SALE
     (Including offers for sale):

     Unknown

6.   WAS INVENTION DEVELOPED USING FUNDS FROM THE FEDERAL GOVERNMENT?
     ___________ IF SO, please identify which contracts:

     No

7.   IS THIS INVENTION RELATED TO ANY OTHER INVENTION FOR WHICH ANY APPLICATION
     OR OTHER INVENTION DISCLOSURE FORM HAS BEEN SUBMITTED? (If so, please
     identify.

     ***

Dated:   ***


*** CONFIDENTIAL MATERIAL REDACTED AND FILED SEPARATELY WITH THE COMMISSION.


                                       3

<PAGE>   99
                                                  (Print Name)


                                      ***





                                           --------------------------
                                                  (Print Name)

Dated:                                  By:         
      --------------------------           --------------------------
                                                  (Signature)


                                           --------------------------
                                                  (Print Name)

Dated:                                  By:      
      --------------------------           --------------------------
                                                  (Signature)


                                           --------------------------
                                                  (Print Name)

Dated:                                  By:      
      --------------------------           --------------------------
                                                  (Signature)




                                       4

<PAGE>   100
                                               (Print Name)



                                      ***



*** CONFIDENTIAL MATERIAL REDACTED AND FILED SEPARATELY WITH THE COMMISSION




                                       4


<PAGE>   101
                                   APPENDIX B



                                Research Program





                                      -32-
<PAGE>   102

                                   APPENDIX B

Nanogen - Becton Dickinson Research Program

Summary:  This research plan was developed jointly with Becton Dickinson during
a series of meetings in ***.  The plan covers two general areas: development of
Nanogen technology for specific Becton Dickinson applications and at BD cost
targets, and the development of Strand Displacement Amplification in the Nanogen
electronic chip format.  The proposed research funding is for three years
contingent upon achievement of project milestones in accordance with the
agreement.  Current milestones and deliverables are specified at the end ***
and ***.  As the program professes, milestones and deliverables for later in
*** and *** will be developed.

Research management.  The Research Management Committee will be responsible for
the general management of the research program. The Research Management
Committee will consist of 6 members, with three members appointed from each
company.  The Committee will be responsible for developing and approving
project proposals, schedules, budgets, manpower and other resource allocation
between the companies, and system and reagent development/manufacturing plans.
In addition, the Committee is responsible for conducting periodic design
reviews and determining milestone attainment.  The Committee will meet on a
quarterly basis.

Project Description:

***


*** CONFIDENTIAL MATERIAL REDACTED AND FILED SEPARATELY WITH THE COMMISSION.
<PAGE>   103
Assumptions:

***

Project Milestones
RESEARCH MILESTONE I/PROJECT A
December 31, 1997

APEX chips
     ***

Permeation materials and attachment chemistry
     ***

Cartridge and advanced chip design
     ***


*** CONFIDENTIAL MATERIAL REDACTED AND FILED SEPARATELY WITH THE COMMISSION.
<PAGE>   104
     ***

Instrument development
     ***

RESEARCH MILESTONE II/PROJECT A
June 30, 1998

APEX chips
     ***

Permeation materials and attachment chemistry
     ***

Cartridge and advanced chip design
     ***

Instrument development
     ***

*** CONFIDENTIAL MATERIAL REDACTED AND FILED SEPARATELY WITH THE COMMISSION.
<PAGE>   105
 ***

Project Milestones
RESEARCH MILESTONE I/PROJECT B
December 31, 1997

Assumptions:
***

tSDA
***

RESEARCH MILESTONE II/PROJECT B
June 30, 1998
***


*** CONFIDENTIAL MATERIAL REDACTED AND FILED SEPARATELY WITH THE COMMISSION.



<PAGE>   106
                                   APPENDIX C

                             Initial Annual Budget

                                      ***



*** CONFIDENTIAL MATERIAL REDACTED AND FILED SEPARATELY WITH THE COMMISSION

<PAGE>   107
                                   EXHIBIT C



                        ADMINISTRATIVE SERVICES AGREEMENT

     THIS ADMINISTRATIVE SERVICES AGREEMENT (The "Agreement") is made and
entered into as of the 1st day of October, 1997 between Becton, Dickinson and
Company, a New Jersey corporation ("Service Provider"), and The Nanogen/Becton
Dickinson Partnership, a Delaware general partnership ("the Partnership").
Service Provider and the Partnership are herein referred to jointly as the
"Parties" and individually as "Party".

                                   WITNESSETH:

     WHEREAS, Service Provider and Nanogen, Inc. ("Nanogen") have entered into a
Master Agreement dated as of October 1, 1997 (the "Master Agreement") pursuant
to which Service Provider and Nanogen have formed a partnership (the
"Partnership") pursuant to that certain General Partnership Agreement of even
date therewith and herewith between Becton Dickinson Venture LLC, a Delaware
limited liability company (the "Becton Partner"), and NanoVenture LLC, a
Delaware limited liability company (the "Nanogen Partner") (the "Partnership
Agreement"); and

     WHEREAS, the Master Agreement provides that Service Provider and the
Partnership shall enter into an agreement relating to certain administrative
services to be provided by Service Provider to the Partnership after the
Effective Date (as such term is defined in the Master Agreement).

     NOW, THEREFORE, in consideration of the mutual covenants herein contained,
the parties hereby agree as follows:


1. SERVICES.

     1.1 Service Provider agrees to provide to the Partnership the tax,
accounting and financial services (the "Services"). The Partnership shall pay
for such Services an amount of compensation which shall reflect the
"Reimbursable Cost" thereof, as such term is defined below.

     1.2 The Parties understand that, prior to the date of this Agreement,
Service Provider may have subcontracted for services in connection with all or
any portion of the Services to be provided to the Partnership hereunder. Service
Provider reserves the right to continue to subcontract with third parties for
Services or enter into new subcontract relationships for any Service; provided,
however, that any such subcontracting relationship or services shall not relieve
Service Provider of any obligation to provide Services



                                       -1-
<PAGE>   108
hereunder. Such subcontractors used in connection with Services provided under
this Agreement will be charged to the Partnership at actual cost.

     1.3 Unless otherwise agreed by the Parties, it is understood and agreed
that a Party shall not provide any services not specifically provided for in
this Agreement.

     1.4 As used herein, the term "Reimbursable Cost" shall mean all direct and
indirect costs incurred by Service Provider in performing its obligations under
this Agreement as determined in accordance with generally accepted accounting
principles and the accounting policies described herein and in accordance with
the budget agreed to annually by the Parties hereto.

     1.5.1 Such costs shall include without limitation:

                  a.       salaries and wages,
                  b.       payroll taxes,
                  c.       contract labor,
                  d.       fringe benefits,
                  e.       expenses incurred in occupying facilities
                           (including leasehold improvements) and
                           equipment related expenses, excluding
                           depreciation and amortization expenses,
                  f.       recruitment and relocation,
                  g.       communications expense,
                  h.       supplies,
                  i.       freight and transportation,
                  j.       training and education,
                  k.       travel expenses,
                  l.       data processing costs,
                  m.       insurance,
                  n.       professional services,
                  o.       depreciation and amortization of facilities
                           (including leasehold improvements) and
                           equipment,
                  p.       a financing charge for capital acquisitions
                           made by Service Provider for use in
                           performing work under this Agreement,
                  q.       outside purchased services,
                  r.       sales and use taxes (including such taxes
                           applicable to the acquisition, use,
                           transfer or deemed transfer of property by
                               Service Provider),
                  s.       periodic lease and rental payments under
                           capital or financing leases, and
                  t.       periodic and special reports,


     1.5.2 In determining Reimbursable Costs allocable to this Agreement,
Service Provider will employ the following accounting policies:



                                       -2-
<PAGE>   109
          a. Capital equipment, facilities and leasehold improvements will be
     assigned an estimated economic useful life and salvage value, if any, and
     depreciation and amortization will be computed using the straight-line
     method. Depreciation and amortization will be allocated to Reimbursable
     Costs under this Agreement directly or through overhead rates applied to
     direct labor expense.

          b. Total facilities expenses of Service Provider, excluding leasehold
     improvement amortization allocated to specific functional areas and net of
     any sublease revenues, will be allocated to Reimbursable Costs under this
     Agreement based on the ratio of square footage utilized by or committed to
     use by direct and indirect personnel engaged in work under this Agreement
     to the total amount of utilized or committed square footage owned or leased
     by Service Provider.

          c. General and administrative expenses of Service Provider will be
     allocated to Reimbursable Costs under this Agreement directly or based on
     the ratio of total Reimbursable Costs to total operating expenses of
     Service Provider, excluding (in both instances) general and administrative
     expenses subject to such allocation.

          d. All other indirect expenses not covered in paragraphs (a) through
     (c) above which are in support of work under this Agreement will be
     allocated to Reimbursable Costs under this Agreement through overhead rates
     applied to direct labor expense.

     1.5.3. The term "capital acquisition" as used herein shall mean that
portion of capital equipment, leasehold improvements or other property, whenever
acquired by Service Provider, which are capitalized on Service Provider's
accounting records and which are either: i. purchased directly by Service
Provider; ii. financed by Service Provider under a conditional sale contract;
iii. financed by Service Provider through a secured loan; or iv. assets
constructed in-house by Service Provider. Assets acquired under capital or
financing leases will not be considered capital acquisitions for purposes of
this section. With respect to capital acquisitions financed by Service Provider
with specific borrowing, the financing charge referred to above will be in the
amount and at the time of the actual financing costs incurred by Service
Provider. With respect to capital acquisitions not financed by Service Provider
with specific borrowing, the financing charge will be based on the prime lending
rate in effect from time to time at Citibank, N.A., New York, New York, plus two
(2) percentage points, to the extent permitted by applicable law, applied to
Service Provider's net book value. Net book value is defined



                                       -3-
<PAGE>   110
as the gross capital acquisition value excluding capital acquisitions financed
by Service Provider with specific borrowing, less related accumulated
depreciation and amortization. The financing charge for each billing period will
be prorated to the extent depreciation or amortization of the capital
acquisitions has been allocated to work other than work under this Agreement
during such period. The financing charge will be calculated monthly based on the
net book value at the end of the preceding fiscal month.


2. TERM AND RENEWAL.

     2.1 The term of this Agreement shall commence as of October 1, 1997 and
shall expire on September 30, 2000, unless terminated by the Parties as provided
herein or conterminously with the dissolution of the Partnership or with the
buyout of a Partnership Interest pursuant to Section 7.8 of the Partnership
Agreement.

     2.2 The Parties may, upon mutual written agreement, extend the term of this
Agreement for additional, successive two (2) year terms. In the event the
Partnership desires to renew this Agreement, the Partnership shall provide
Service Provider with written notice ("Notice of Renewal") thirty (30) days in
advance of the expiration of the Service term, or any renewal term. Service
Provider shall respond in writing to the Partnership within fifteen (15) days.
Upon mutual agreement of the Parties, this Agreement shall be amended in writing
to effect such renewal of Services.

3. COMPENSATION.

     3.1 In consideration for the Services to be performed by Service Provider,
the Partnership shall pay to Service Provider the compensation described in
Section 1.1 hereof.

     3.2 Except as otherwise provided in the applicable schedule, invoices for
Services provided hereunder shall be rendered in accordance with the Service
Provider's current and reasonable practices, and invoiced amounts shall be paid
promptly when due. In the event that a dispute arises, the Partnership may
either pay the entire amount of the invoice (including the disputed amount) and
notify the Service Provider that it disputes the invoice, or return the invoice
without payment before the due date. Both parties agree that any such disputes
shall be resolved in accordance with the provisions of Article V of the Master
Agreement. If resolution is in favor of Service Provider, and if payment has
been withheld, a late payment charge may be added to the extent permitted under
applicable law, based on the Citibank, N.A., reference rate on the date such
payment is made plus two (2) percentage points and computed from the date the
original invoice was due to be paid to the date of payment. If the resolution is
in favor of



                                       -4-
<PAGE>   111
the Partnership and payment has been made pending such resolution, the payment
or any appropriate adjusted balance thereof shall be returned to the Partnership
with interest based on the same calculation as above.

     3.3 Service Provider shall maintain such independent and verifiable books
and records as are required to evidence its compliance with the terms of this
Agreement.

     3.4 Service Provider shall permit one or more representatives of the
Partnership to inspect, at any reasonable time and upon reasonable terms, but no
more often than once per quarter, its books and records pertaining to the basis
for payments to it for Services pursuant to this Agreement and to its compliance
with the provisions of this Agreement for as long as this Agreement is in effect
and Services are being provided hereunder.

4. CONFIDENTIALITY.

     4.1 The Parties agree that the terms and provisions of the Confidentiality
Agreement (as defined in the Partnership Agreement) shall apply to the terms of
this Agreement, and the Parties hereto hereby agree to be bound by the terms and
provisions thereof.

5. MISCELLANEOUS.

     5.1 Each party to this Agreement shall be responsible for the fees and
expenses incurred by it incidental to the consummation of the transactions
contemplated by this Agreement (including, without limitation, fees and
disbursements of its attorneys and accountants in connection with their
respective services on behalf of each party).

     5.2 Subject to the terms and conditions herein provided, each of the
parties shall take, or cause to be taken, such action to execute and deliver, or
cause to be executed and delivered, such additional documents and instruments
and to do, or cause to be done, all things necessary, proper or advisable under
the provisions of this Agreement and under applicable laws to consummate and
make effective the transactions contemplated by this Agreement.

     5.3 This Agreement, the Master Agreement (including each agreement the form
of which is attached as an exhibit thereto) and the Confidentiality Agreement
(as such term is defined in the Partnership Agreement) set forth the entire
understanding of the parties with respect to the subject matter hereof and
supersede and replace all prior agreements, understandings, writings and
discussions between the parties relating to said subject matter. Any and all
previous agreements and understandings between the parties regarding the subject
matter hereof, whether written or oral, are superseded by this



                                       -5-
<PAGE>   112
Agreement.  In the event of any conflict between any term or
provision of this Agreement and any of the foregoing
agreements, the Master Agreement shall control.

     5.4 This Agreement shall not be assignable by Becton or the Partnership,
nor shall any obligations hereunder be delegated to a third party, without the
other party's prior written consent, which consent shall not be unreasonably
withheld or delayed. In the event that Becton or the Partnership, as the case
may be, does not respond to a request from the other for consent to an
assignment or delegation within fifteen (15) days following written notice
requesting such consent, such consent shall be deemed to be granted. In
addition, a condition to any assignment or delegation hereunder shall be that
the successor in interest expressly agrees in writing to assume the assigning or
delegating party's obligations hereunder. All of the terms and provisions of
this Agreement shall be binding upon and inure to the benefit of and be
enforceable by the respective permitted successors and assigns of the parties.
No such assignment shall release the assigning party from its obligations
hereunder. Notwithstanding the foregoing, the consent of either party shall not
be required in connection with a merger involving the other party or with
respect to an assignment of this Agreement in connection with the acquisition,
sale of all or substantially all of the assets of the other party, change of
control or similar transaction.

     5.5 This Agreement may be amended only by a written instrument executed by
the parties hereto. The failure of any party at any time or times to require
performance of any provision hereof shall in no manner affect its rights at a
later time to enforce the same. No waiver by any party of any condition or term
in any one or more instances shall be construed as a further or continuing
waiver of such condition or term or any other condition or term.

     5.6 Any notice, request, demand, waiver, consent, approval, or other
communication which is required or permitted hereunder shall be in writing and
shall be deemed given only if delivered personally, by facsimile (upon receipt
of appropriate written confirmation) or sent by registered or certified mail,
return receipt requested, or by overnight courier service, postage prepaid as
follows:

     If to Becton, to:

     Becton Dickinson Microbiology Systems
     7 Loveton Circle
     Sparks, MD 21152
     Attention: President



                                       -6-
<PAGE>   113
     With required copies to:

     Becton, Dickinson and Company
     1 Becton Drive
     Franklin Lakes, NJ 07417-1880
     Attention:  General Counsel

     If to the Partnership, to:

     The Nanogen/Becton Dickinson Partnership
     c/o Nanogen, Inc.
     10398 Pacific Center Court
     San Diego, CA 92121
     Attention:  Chief Executive Officer

     With required copies to:

     Nanogen, Inc.
     10398 Pacific Center Court
     San Diego, CA 92121
     Attention:  General Counsel

     and

     Becton, Dickinson and Company
     1 Becton Drive
     Franklin Lakes, NJ 07417-1880
     Attention:  General Counsel

or to such other address as the addressee may have specified in a notice duly
given to the sender as provided herein. Such notice, request, demand, waiver,
consent, approval or other communication will be deemed to have been given as of
the date so received (in case of personal delivery or overnight courier
delivery) or upon refusal to accept delivery of same.

     5.7 This Agreement shall be governed by and construed in accordance with
the laws of the State of Delaware without regard to its choice of laws
principles. This Agreement shall be construed and interpreted without
application of any principle or rule to the effect that ambiguities are to be
construed against the party responsible for drafting the agreement. The headings
contained herein are for reference purposes only and shall not in any way affect
the meaning of this Agreement.

     5.8 The terms and provisions contained in this Agreement are for the sole
benefit of the parties and their successors and assigns, and they shall not be
construed as conferring and are not intended to confer any rights on any other
persons.



                                       -7-
<PAGE>   114
     5.9 This Agreement may be executed in any number of counterparts, each of
which shall be deemed an original, but all of which together shall constitute
one instrument.

     5.10 If any provision(s) of this Agreement are or become invalid, or are
ruled illegal by any court of competent jurisdiction, or are deemed
unenforceable under then current applicable law from time to time in effect
during the term hereof, it is the intention of the parties hereto that the
remainder of this Agreement shall not be affected thereby. It is further the
intention of the parties that in lieu of each such provision which is invalid,
illegal, or unenforceable, there be substituted or added as part of this
Agreement, a provision which shall be as similar as possible in economic and
business objectives as intended by the parties to such invalid, illegal, or
unenforceable provision, but which shall be valid, legal, and enforceable, and
shall be mutually agreed by the parties.

     5.11 Nothing contained in this Agreement shall be deemed to create a
partnership between Becton and the Partnership, except as expressly provided in
the Partnership Agreement. No party shall be liable for the act of any other
party unless such act is expressly authorized in writing by all of the parties
hereto.

BECTON, DICKINSON AND COMPANY


By   /s/ Vincent Forlenza
  ---------------------------------
     Name:
          -------------------------
     Title:
           ------------------------


THE NANOGEN/BECTON DICKINSON PARTNERSHIP

By   Becton Dickinson Venture LLC


     By   /s/ Vincent Forlenza
       ---------------------------------
          Name:
               -------------------------
          Title:
                ------------------------


By   NanoVenture LLC

     By   /s/ Howard Birndorf
       ---------------------------------
          Name:   Howard Birndorf
               -------------------------
          Title:  Manager
                ------------------------



                                       -8-
<PAGE>   115
                                LICENSE AGREEMENT


      THIS LICENSE AGREEMENT is entered into as of the 1st day of October 1997
by and between BECTON DICKINSON AND COMPANY, a New Jersey corporation, through
its Becton Dickinson Microbiology Systems, Division, having a place of business
at 7 Loveton Circle, Sparks, Maryland 21152 (hereinafter "Becton") and NANOGEN,
INC., a California corporation having its principal office and place of business
at 10398 Pacific Center Court, San Diego, California 92121 (hereinafter
"Nanogen").

      WHEREAS, Becton and Nanogen are parties to a certain Confidentiality
Agreement dated February 6, 1997 as amended; and

      WHEREAS, Becton owns certain patent rights related to its proprietary
Strand Displacement Amplification ("SDA") technology; and

      WHEREAS, Nanogen desires to make, have made, use, offer to sell, sell and
import certain products which employ Becton's SDA technology or would enable a
purchaser to employ Becton's SDA technology in certain applications; and

      WHEREAS, simultaneous with the execution of certain agreements which will
establish a joint venture with respective Becton and Nanogen entities as
partners thereto, Becton and Nanogen desire to enter into a separate agreement
wherein Becton would grant to Nanogen a non-exclusive license to make, have
made, use, offer to sell, sell, import certain products which employ Becton's
SDA technology or would enable a purchaser to employ Becton's SDA technology in
certain applications outside of the field of the joint venture between the
Becton and Nanogen partners.

      NOW, THEREFORE, in consideration of the mutual covenants and undertakings
contained herein, the parties hereby agree as follows:

      1.    Definitions. As used in this agreement:

      1.1   "Affiliate" shall mean any corporation or other business entity
controlled by or in common control of a party. "Control" as used herein means
the ownership directly or indirectly of fifty percent (50%) or the maximum
interest permitted by local law of the voting stock of a corporation or a fifty
percent (50%) or "rata interest in the income of such corporation or other by
entity or the ability otherwise


                                      -1-
<PAGE>   116
of a party to secure that the affairs of such corporation or other business
entity are managed in accordance with its wishes.

      1.2   "Agreements" shall mean this agreement and any exhibits, attachments
or addenda hereto, and any renewals or extensions of this agreement.

      1.3   "Becton" shall include all of the divisions, subsidiaries and
Affiliates of Becton Dickinson and Company.

      1.4   "Effective Date" shall mean October 1, 1997.

      1.5   "Field" shall mean in vitro human genetic testing and in vitro human
cancer diagnostics employing electronically addressable oligonucleotide
microarrays.

      1.6   "Know-How" shall mean Becton's SDA know-how to practice the Patent
Rights in the Field and Becton Intellectual Proper as such term is defined in
the Research Agreement as defined in Paragraph 1.11, which is directly related
to SDA and is used in the manufacture, use, offer for sale, salt or importation
of any Product as such term is defined in the Research Agreement.

      1.7   "Licensed Product(s)" shall mean any assay product which contains
reagents used for the practice of a method which is the subject matter of a
claim of the Patent Rights.

      1.8   "Net Sales" shall mean the amount billed or invoiced on sales of
Licensed Products by Nanogen less:

      (a)   Customary trade, quantity or cash discounts and non-affiliated
brokers' or agents commissions actually allowed and taken;

      (b)   Amounts repaid or credited by reason of rejection, rebate or return;
and/or

      (c)   To the extent separately stated on purchase orders, invoices or
other documents of sales, taxes or duties levies on and/or other governmental
charges made as to production, sale, transportation, delivery or use and paid by
or on behalf of Nanogen.

      1.9   "Nanogen" shall include all of the divisions, subsidiaries and
Affiliates of Nanogen.


                                      -2-
<PAGE>   117
      1.10  "Patent Rights" shall mean the U.S. Patents and pending U.S. patent
applications listed in Appendix A to this Agreement as amended Tom time to time
to include (a) U.S. Patents and pending U.S. patent applications with claims to
SDA Inventions (b) Becton Patent Rights as such term is defined in the Research
Agreement, as amended from time to time, which are directly related to SDA and
are used in the manufacture, use, offer for sale, sale or importation of any
Product as such term is defined in the Research Agreement and (c) U.S. Patents
and pending U.S. patent applications with claims to SDA Improvements as such
term is defined in the Research Agreement, as amended from time to time, and any
divisionals, continuations, continuations-in-part, re-examinations, reissues,
and all foreign equivalents of any of the foregoing in whole or in part.

      1.11  "Research Agreement" shall mean the Collaborative Research and
Development and License Agreement entered into by Becton, Nanogen and the
Partnership concurrently with the execution of this Agreement.

      1.12  "ADA Invention(s)" shall mean any patentable and unpatentable
inventions, ideas, discoveries, improvements, design rights, semiconductor mask
works, trade secrets, know-how and any equivalents thereof which are made,
developed, conceived or reduced to practice by Nanogen, or on behalf of Nanogen
during the term of this Agreement, while conducting activities in accordance
with the license granted herein, and which constitute or employ any
improvement(s) related to SDA.

      2.    License Grant.

      2.1   As consideration for fees and royalties to be paid by Nanogen to
Becton pursuant to this Agreement, Becton hereby grants to Nanogen a worldwide,
non-exclusive license in and to the Patent Rights and Know-How to make, have
made, use, offer to sell, sell and import Licensed Products strictly limited for
use only in the Field.

      2.2   The non-exclusive license granted to Nanogen in Paragraph 2.1 does
not include a right for Nanogen to grant sublicenses.

      3.    Payment and Records.

      3.1   Nanogen shall pay to Becton a royalty of *** of Net Sales.

      3.2   Nanogen shall submit to Becton within sixty (60) days after March
31, June 30, September 30 and December 31 of each calendar year during the term
of this Agreement, and upon the expiration or effective termination of this
Agreement, reports for the preceding three month period identifying the Net
Sales, and


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                                      -3-
<PAGE>   118
the amount of royalty due to Becton together with payment of such royalty
amount. If no royalties are due to Becton for any reporting period, the written
report shall so state. All royalties due hereunder shall be payable in United
States Dollars; provided, however, that if any payment on account of Net Sales
is received by Nanogen in any currency other than United States Dollars, such
amount shall be converted to United States Dollars at the exchange rate
published in the Wall Street Journal on the date of remittance of such payment
to Becton.

      3.3   Nanogen shall maintain complete and accurate books of account and
records showing all sales of Licensed Products and all NO Sales attributable to
such sales. For purposes of verifying the accuracy of the royalties paid by
Nanogen pursuant to this Agreement, such books and records shall be open to
inspection, during usual business hours, by an independent certified public
accountant acceptable to Nanogen. In the event that any such inspection shows
any underreporting and underpayment by Nanogen in excess of ten percent ( 10%)
for any fiscal year, then Nanogen shall pay the cost of such examination, the
amount of any underpaid royalty. Such books and records shall be maintained for
at least three full years after each accounting period has ended.

      4.    Favored Licensee. If at any time after the Effective Date, Becton
shall grant a non-exclusive license to any unaffiliated third party with respect
to the Patent Rights and Know-How, Becton shall promptly provide to Nanogen a
complete copy of the third party license agreement on a confidential basis with
appropriate redaction to maintain as confidential the identity of such third
party. Nanogen shall, within ninety (90) days of the date of receipt of the copy
from Becton, have the option to substitute the terms of such third party license
agreement, in totality, effective thirty (30) days after Nanogen notifies
Becton, in writing, that Nanogen desires to make such substitution. The terms
of any such third party license agreement substituted for the terms of this
Agreement, as specified above, shall be implemented prospectively only, and
Nanogen shall not be entitled to a refund, credit or return of any monies paid
or payable to Becton while this Agreement is in effect between the parties.

      5.    SDA Inventions.

      5.1   As partial consideration for the license granted by Becton to
Nanogen pursuant to this Agreement, Nanogen hereby agrees that all SDA
Inventions shall be owned exclusively by, and vest entirely in, Becton.

      5.2   In order to facilitate the provisions of Paragraph 5.1, Nanogen
shall promptly notify Becton, in writing, of all SDA Inventions.

      5.3   Nanogen shall, and does hereby, irrevocably grant and assign to
Becton the entire assignable right, title and interest, without further
compensation in and to any and all SDA Inventions, together with: (a) the right
to apply for patents thereon in any and all countries of the world, and (b) the
entire right, title and interest in and to any and all applications for patents
which may be prepared or filed thereon at Becton's discretion and expense, and
in and to any and all of the eventuating patents.

      5.4   Nanogen shall execute and driver to Becton all descriptions,
applications, assignments and other documents and instruments


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                                      -4-
<PAGE>   119
necessary or proper to carry out the provisions of this License Agreement
without further compensation. Nanogen shall also cooperate with and assist
Becton or its nominees in all reasonable ways and at all reasonable times,
including, but not limited to, testifying in all legal proceedings, signing all
lawful papers and in general performing all lawful acts reasonable, necessary or
proper, to aid Becton in obtaining, maintaining, defending and enforcing all
lawful patent, trade secret, know-how and the like related to SDA Inventions in
the United States and elsewhere; and Nanogen shall maintain all information and
communications related thereto in confidence.

      6.    Licensed Product Marking. Nanogen shall mark all Licensed Products
made, used, offered for sale, sold or imported into the United States with
applicable United States Patent numbers in accordance with United States Patent
Laws. Nanogen shall also mark all Licensed Products made, used, offered for
sale, sold or imported into any other country with applicable patent numbers in
accordance with such country's patent law.

      7.    Maintenance and Enforcement of Patent Rights.

      7.1   Nanogen shall notify Becton promptly in writing if Nanogen becomes
aware of any infringement or suspected infringement of any Patent Right by an
unlicensed party.

      7.2   In the event of infringement of any Patent Right by an unlicensed
party, Beckon shall have the right, but not the obligation, to institute and
pursue legal proceedings at its own discretion and expense, and shall retain all
proceeds recovered, in settlement or through a judgment, in all such
proceedings.

      8.    Defense of Patent Infringement Actions.

      8.1   Nanogen shall give Becton prompt written notice of each claim or
allegation thee Nanogen's use of SDA in the manufacture, use, offer for sale,
sale or importation of a Licensed Produce constitutes an infringement of ***
("Alleged Infringing Activity").

      8.2   If such claim or allegation referenced in Paragraph 8.1 is (a) the
first claim or allegation against Becton, or any other party which has a license
in and to the Patent Rights and/or Know-How from Becton, that the use of SDA in
the manufacture, use, offer for sale, sale or importation of any product or
service constitutes an infringement of *** and (b) Nanogen's Alleged Infringing
Activity is the use of SDA as claimed in any issued patents of the Patent Rights
listed in the original unamended Appendix A, then Becton shall conduct the
defense of any action instituted against Nanogen based on such claim or
allegation.


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                                      -5-
<PAGE>   120
      8.3   If Becton conducts such defense pursuant to Paragraph 8.2, then
Becton shall also have the right, but not the obligation in its sole discretion,
to approve, beforehand, in writing, any proposed settlement by Nanogen of any
such action.

      8.4   All attorney's fees and disbursements related thereto incurred in
any suchdefense or settlement pursuant to Paragraph 8.2 or Paragraph 8.3 shall
be split evenly by Nanogen and Becton, provided, however, that any and all
damages and any other expenses of any other type or kind whatsoever which may be
assessed for infringement, and any and all enhanced damages, induding, but not
limited to multiples of assessed damages, punitive damages, costs and attorney's
fees of the party asserting the claim of infringement shall be the sole
responsibility of, and paid by, Nanogen.

      8.5   During the time period that Becton conducts any such defense
pursuant to Paragraph 8.2, Nanogen shall deposit all accrued royalties payable
to Becton under this Agreement in an interest bearing escrow account. If, after
defense or settlement of any such action, Nanogen is not prohibited,
contractually or by court order, from making, using, offering for sale, soling
or importing Licensed Products, then Nanogen shall promptly pay to Becton all
such escrowed royalties and all interest accrued for such escrowed royalties.

      8.6   In the event that following conclusion of the defense or settlement
of any such action, Nanogen is required to enter into a royalty-bearing license
agreement pursuant to which Nanogen receives a license in and to ***
to make, have made, use, offer to sell, sell and import Licensed Products, and
such royalty is *** or greater of Net Sales of Licensed Products, then the
prospective royalty payable by Nanogen to Becton pursuant to Paragraph 3.1 of
this Agreement shall be reduced to *** of Net Sales as of the date of last
signature to such royalty-bearing license agreement.

      9.    Term and Termination.

      9.1   This Agreement shall remain in effect for a period ending: (a) on
the expiration date of the last to expire of the Patent Rights; (b) on the date
on which all of the Patent Rights have been finally adjudicated to be invalid
and/or unenforceable; or (c) on the date of termination of this Agreement in
accordance with Paragraph 9.2 or Paragraph 9.3, whichever occurs sooner.

      9.2   Prior to expiration or termination of this Agreement by any of the
occurrences specified in Paragraph 9.1 (a) or (b), Nanogan may, at any time,
without cause, terminate this Agreement upon sixty (60) days prior written
notice to Becton.


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                                      -6-
<PAGE>   121
      9.3   This Agreement may also be terminated by either party upon default
or breach of a material obligation or condition by the other, such termination
being effective sixty (60) days after receipt by the alleged tefauldog or
breaching party of written nodee of such termination under this Paragraph
specifying the default or breach; provided, however, that if the default or
breach is cured or shown to be non-existent within the sixty (60) day period
after receipt of written notice, the notice shall be deemed automatically
withdrawn and of no effect If the pardes do not agree on whether a default or
breach is of a Material obligation or condition, then the parties shall resolve
such a dispute in accordance with Paragraphs 13.1, 13.2, 13.3 and 13.4 of this
Agreement, and no termination shall occur.

      9.4   In the event that either party shall make an assignment for the
benefit of creditors; voluntarily or involuntarily file a petition for
bankruptcy or reorganization. or substantially discontinue its business with
respect to this Agreement, the ether party shall have the right to terminate
this Agreement effective immediately upon written notice, but without prejudice
to any other rights of either party.

      9.5   Following termination of this Agreement under Paragraph 9.2,
Paragraph 9.3 or Paragraph 9.4, Nanogen shall have the right for *** to sell all
Licensed Products on hand at the time of termination so long as the royalties
from such sales due Becton are paid to and statements rendered to Becton with
respect to such sales of Licensed Products when due in accordance with this
Agreement.

      9.6   Upon termination, the parties hereto will have no further
obligations to each other except for those obligations pursuant to Paragraphs
3.3, 5.1, 5.2, 5.3, 5.4, 9.5 and 12 of this Agreement which shall survive
termination.

      10.   Representations and Warranties.

      10.1  Becton hereby represents and warrants to Nanogen that it is the
owner of the entire right, title ant interest to the Patent Rights ant Know-How
and that it has full authority and power to enter into this Agreement and to
grant the rights and license specified herein that it has secured any and all
necessary approvals, permits or consents teemed necessary or advisable for the
consummation of the transactions contemplated hereby and that upon execution by
Becton and Nanogen this Agreement shall immediately be a valid and binding
obligation of Nanogen enforceable in accordance with its terms.

      10.2  Nanogen hereby represents ant warrants to Becton that it has full
authority and power to enter into this Agreement, that it has secured any ant
all necessary approvals, permits or consents deemed necessary or advisable for
the consummation of the transactions contemplated hereby and that upon execution
by

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                                      -7-
<PAGE>   122
Becton and Nanogen this Agreement shall immediately be a valid and binding
obligation of Nanogen enforceable in accordance with its terms.

      11.   Notices. Any notice, request, instruction or other document to be
given hereunder shall be deemed validly given, if in writing and delivered
personally, by overnight courier, or sent by U.S. certified mail, postage
prepaid, return receipt requested, as follows:

      If to Nanogen:

              Nanogen Inc.
              10398 Pacific Center Court
              San Diego, California 92121
              Attn: Chief Executive Officer
              facsimile - (619) S46-7717

      with a copy to:

              Nanogen Inc.
              10398 Pacific Center Court
              San Diego, California 92121
              Attn: General Counsel
              facsimile - (619) 546-7717

      and if to Becton:

              Becton Dickinson Microbiology Systems
              7 Loveton Circle
              Sparks, Maryland 21152
              Attn: Vice President, Licensing & Patents
              facsimile- (410) 316-4991

      with a copy to:

              Becton Dickinson and Company
              1 Becton Drive
              Franklin Lakes, New Jersey 07417
              Attention: Chief Patent and Licensing Counsel
              facsimile - (201) 848-9228

      Alternatively, notices and other communications may be sent by facsimile
transmission with a confirmation copy sent by


                                      -8-
<PAGE>   123
one of the forms of delivery set forth above. All notices and other
communications shall be deemed delivered on the date of actual receipt.

      12.   Confidentiality and Non-disclosure. That certain Confidentiality
Agreement between Becton and Nanogen dated February 6, 1997 as amended shall
remain in full force and effect, except that the terms "Becton Informationn,
~Nanogen Information" and "Information" shall include information provided
pursuant to this Agreement, including, but not limited to, all terms and
provisions of this Agreement and all Appendices hereto, and the "Stated Purpose"
shall include activities contemplated by this Agreement.

      13.   Dispute Resolution.

      13.1  Except as otherwise set forth in this Agreement, the parties shall
attempt in good faith to resolve any dispute arising out of or related to this
Agreement, including but not limited to any claim of breach, termination or
invalidity, promptly by negotiations between the Chief Executive Officer of
Nanogen and the President of Becton Dickinson Microbiology Systems or other
executives of the parties who have authority to settle the dispute. Either party
may give the other party written notice of any dispute not resolved in the
normal course of business. Within twenty (20) days after delivery of such
notice, executives of both parties shall discuss by telephone or meet at a
mutually acceptable time and place, and thereafter as often as they reasonably
deem necessary, to exchange relevant information, and to attempt to resolve the
dispute. If the matter has not been resolved within forty (40) days of the
disputing party s notice, the matter shall be referred to the Board of Directors
of Nanogen and to such executive officer of Bccton knowledgeable of the subject
matter thereof as the Chief Executive Officer of Becton in his discretion shall
nominate for further consideration in an attempt to resolve the matter. If a
negotiator intends to be accompanied at a meeting by an attomey, the other
negotiator shall be given at least three (3) working days' notice of such
intention, and may also be accompanied by an afforney. All negotiations pursuant
to Paragraph 13.1 and pursuant to Paragraph 13.2 are confidential and shall be
treated as compromise and settlement negotiations for the purposes of the
Federal Rules of Evidence and any state rules of evidence.

      13.2  If a matter has not been resolved under the procedures set forth in

Paragraph 13.1 above within sixty (60) days of the disputing Party's notice, or
if the parties fail to discuss or meet within twenty (20) days, then within ten
(10) days thereafter, either party may, but shall not be obligated to, initiate
nonbinding mediatdon of the controversy or claim under the Center for Public
Resources Model ADR Procedures for Mediation of Business Disputes (the HCPR
Proceduresn). Once the mediation is initiated by one party, the other party
agrees to participate in and conduct mediation in accordance with the CPR
Procedures in good faith and not pursue other legal remedies while such
mediation is proceeding. If neither party initiates mediation within the ten
(10)


                                      -9-
<PAGE>   124
day period, or if the dispute has not been resolved by such mediation within
sixty (60) days following initiation of mediation, either party may pursue all
remedies available.

      13.3  All applicable statutes of limitations and defenses based on the
passage of time shall be tolled while the negotiation and mediation procedures
set forth in Paragraphs 13.1 and 13.2 are pending. The parties will take such
action, if any, as may be reasonably required to effectuate such tolling.

      13.4  Notwithstanding the foregoing, the remedy at law for any breach
of the provisions of this Agreement may be inadequate, and, accordingly, an
aggrieved party seeking equitable relief or remedies for such a breach shall
have the right and is hereby granted the privilege, in addition to all other
remedies at law or in equity, to proceed directly in a court of competent
jurisdiction to seek temporary or preliminary equitable relief.

      14.   Miscellaneous.

      14.1  This Agreement sets forth the entire understanding of the parties
with respect to the subject matter hereof and supersedes and replaces all prior
agreements, understandings, writings and discussions between the parties
relating to said subject matter. No change or amendment hereof shall be
effective unless in writing and signed by the parties. Any and all previous
agreements and understandings between the parties regarding the subject matter
hereof, whether written or oral, arc superseded by this Agreement.

      14.2  Any term or provision of this Agreement may be waived at any time by
the party entitled to the benefit thereof, but only by a written instrument
executed by such party or a duly authorized officer of any such party hereto.

      14.3  This Agreement shall not be assignable by Nanogen without Becton's
prior written consent. Notwithstanding the foregoing, if notified in writing by
Nanogen of a party to which Nanogen desires to assign this Agreement in
conjunction with a sale of all or substantially all of the assets of Nanogen,
and such other party requires a license from Becton to conduct for itself
certain of those assets to be acquired from Nanogen, *** for the same Field as
this Agreement.

      14.4  This Agreement shall be binding upon and inure to the benefit of and
be enforceable by the parties hereto and their respective successors and
permitted assigns.

      14.5  The representations, warranties, covenants and agreements contained
in this Agreement are for the sole benefit of the parties

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                                      -10-
<PAGE>   125
and their successors and permitted assigns, and they shalt not be construed as
conferring and are not intended to confer any rights on any other persons.

      14.6  All section headings and the use of a particular gender are for
convenience only and shall in no way modify or restrict any of the terms or
provisions hereof.

      14.7  This Agreement may be executed in two counterparts, each of which
shalt be deemed an original, and each of the parties may become a party hereto
by executing a counterpart hereof This Agreement and any counterpart so executed
shall be deemed to be one and the same instrument.

      14.8  If any provision of this Agreement or application thereof to anyone
or under any circumstance is adjudicated to be invalid or unenforceable in any
jurisdiction, such invalidity or unenforceability shall not affect any other
provisions or applications of this Agreement which can be given effect without
the invalid or unenforceable provision or application and shaft not invalidate
or render unenforceable such provision in any other jurisdiction.

      14.9  Nothing contained in this Agreement shall be deemed to create a
partnership between Becton and Nanogen neither party shall be liable for the act
of the other party unless such act is expressly authorized in writing by all of
the other party.

      14.10 This Agreement shall be interpreted in accordance with the laws of
the State of Delaware. This Agreement shall be construed and interpreted without
application of any principle or rule to the effect that ambiguities are to be
construed against the party responsible for drafting the agreement.

      IN WITNESS WHEREOF, the parties have executed this Agreement through duly
authorized representatives as of the date first above written.

NANOGEN, INC.                          BECTON DICKINSON AND COMPANY


By  /s/ Howard C. Birndorf             By  /s/ Vincent A. Forlenza
   -------------------------------        --------------------------------
           Howard C. Birndorf                    Vincent A. Forlenza
                   CEO                                 President,
                                                BD Microbiology Systems

Date   10-7-97                         Date  10-7-97
     -----------------------------          ------------------------------


                                      -11-
<PAGE>   126
                                   APPENDIX A

                      U.S. PATENTS AND PATENT APPLICATIONS



1.    U.S. Patent No. 5,270,184, entitled Nucleic Target Generation"

2.    U.S. Patent No. 5,422,252, entitled "Simultaneous Amplification of
      Multiple Targets"

3.    U.S. Patent No. 5,455,166, entitled Strand Displacement Amplification"

4.    U.S. Patent No. 5,536,649, entitled Decontamination of Nucleic Acid
      Amplification Reactions"

5.    U.S. Patent No. 5,648,211, entitled Strand Displacement Amplification
      Using Thermophilic Enzymes

6.    U.S. Patent Application Serial No. ***

7.    U.S. Patent Application Serial No. ***

8.    U.S. Patent Application Serial No. ***

9.    U.S. Patent Application Serial No. ***


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                                      -12-
<PAGE>   127
                                           Becton Dickinson and Company
                                           1 Becton Drive
                                           Franklin Lakes, New Jersey 07417-1880
                                           (201) 87-6800


   BECTON

DICKINSON



                                 October 1, 1997



VIA OVERNIGHT MAIL


Mr. Howard C. Birndorf
Chairman and Chief Executive Officer
Nanogen, Inc.
10398 Pacific Center Court
San Diego, California 92121


      Re:   ***


Dear Howard:

      This letter will summarize the approach we have discussed regarding the
contemplated acquisition by our proposed general Partnership (the "Partnership")
of the assets of *** and certain intellectual property rights of ***. It is our
mutual intention that the Partnership would acquire both the *** assets (as
described in Nanogen's letter to *** dated May 13, 1997, a copy of which is
attached hereto), and the *** intellectual property rights in question (as
described in our joint letter to *** dated August 13, 1997, a copy of which is
also attached hereto). The basis upon which the Partnership would acquire the
*** assets and the *** intellectual property is generally as follows:

      1.    The purchase price for the *** assets, based upon the May 13 letter,
would be up to an aggregate maximum of $***; and




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<PAGE>   128
Mr. Howard C. Birndorf
October 1, 1997
Page 2


      2.    Acquisition of the *** intellectual property rights would encompass
an aggregate ***, for which the Partnership would be responsible).

      3.    In the event that the acquisition by the Partnership of the ***
assets and the *** intellectual property rights is ultimately agreed upon by
Becton, Nanogen and the respective parties, it is intended that Becton and
Nanogen each would contribute to the Partnership *** of the *** of the purchase
price payable at the closing for the *** assets, and the *** for the ***
intellectual property rights. Subject to approval of the proposed transactions
and agreement as to all applicable terms and conditions, Becton would lend to
Nanogen not more than ***, representing Nanogen's contribution toward the
aggregate *** outlay *** for the two transactions (the "Loan"), on the following
basic terms:

      (a)   The Loan would be evidenced by a Promissory Note with a term of not
greater than *** (as more fully discussed below), bearing interest at the rate
of *** per annum, in a form to be mutually agreed upon.

      (b)   The entire outstanding principal balance of the Loan, together with
accumulated interest thereon, would be payable on the sooner to occur of the
second anniversary of the Loan or upon the consummation by Nanogen of an iniital
public offering (the "IPO") of Nanoen's common stock (the "Common Stock"). In
the event of Nanogen's consummation of an IPO prior to the second anniversary
date, uponNanogen's consummation of the IPO: (i) the accumulated interest would
be payable in full; and (ii) Becton would convert the entire outstanding
principal balance of the Loan into such number of shars of the Common Stock as
would result from dividing the outstanding principal balance of the Loan by the
per-share price of the Common Stock in the IPO. Becton would have the right to
demand that Nanogen file a registration statement covering the Common Stock to
be effective no earlier than six (6) months following the closing of the IPO. In
the event that such demand registration were filed prior to one (1) year
following the closing of the IPO, Becton and Nanogen would split the costs of
the registration, other than underwriting discounts and commissions, which would
be paid by Becton. If such registration statement were filed thereafter, Nanogen
would bear all costs of the registration, other than underwriting discounts and
commissions, which would be paid by Becton. The registration rights would
otherwise be on customary terms and conditions.

      4.    If the Partnership were to so determine, the Partnership would
contract with Becton on terms to be negotiated to manufacture, market and sell
the *** products for the Partnership.




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<PAGE>   129
Mr. Howard C. Birndorf
October 1, 1997
Page 3


      5.    As part of these transactions, consistent with our mutual goal of
allowig the fullest possible exploitation by the parties of the *** and ***
intellectual property, the Partnership would conconcurrently confer upon each of
Becton and Nanogen rights in such intellectual property as would not conflict
with the Partnership's activities on arm's-length terms and conditions to be
agreed upon.

      This letter solely describes the intentions of the parties subject to
completion of all the matters contemplated in this letter, and does not purport
to contain all terms and conditions pertaining thereto. Accordingly, neither
party shall be legally obligatd with respect to this series of transactions
unless, and until, the Partnership is created, all requisite corporate and other
approvals have bene procured with respect to the transactions contemplated
hereby, and definitive agreements covering all of the foreoing matters have been
eecuted and delivered by all parties thereto.

      This letter, including the contents hereof, is also subject to th
eprovisions of our Confidentiality Agreement dated February 5, 1997, as amended.

      Please signify that this letter correctly describes our intentions by
countersigning and dating the enclosed copy and returning it to the attention of
Dean J. Paranicas in our Law Department. We look forward to proceeding with
these transactions.

                                      Sincerely,

                                      /s/ Vincent A. Forlenza

                                      Vincent A. Forlenza
                                      President - Worldwide Microbiology Systems

AGREED TO:

NANOGEN, INC.


By:  /s/ Howard C. Birndorf
    ----------------------------------------------
         Howard C. Birndorf
         Chairman and Chief Executive Officer

Dated:   10-7-97
       -------------------------------------------


***   CONFIDENTIAL MATERIAL REDACTED AND FILED SEPARATELY WITH THE COMMISSION.


<PAGE>   130
Mr. Howard C. Birndorf
October 1, 1997
Page 4


cc:  David A. Hahn, Esq.
     Dean J. Paranicas, Esq.
     Caroline Popper, M.D.
     Thomas E. Sparks, Jr. Esq.


<PAGE>   131
[Nanogen Letterhead]

HARRY J. LEONHARDT, ESQ.
General Counsel, Vice President and Secretary

May 13, 1997


                             Via Fax (619) 452-6753


***, Ph.D.
President
***
***
San Diego, California 92121

      RE:   ***

Dear Mr. ***:

      The purpose of this Letter of Intent is to set forth the basic aspects
upon which we would be interested in negotiating with you for the acquisition of
all the assets of ***. This Letter hereby supersedes all prior agreements and
understandings between the parties, and supersedes specificially, the May 6,
1997 Letter of Intent.

      (1)   Subject to the results of our Due Diligence (hereainfter defined)
and upon the execution of the Contemplated Agreement (hereinafter defined), the
purchase price to be paid for the assets of the COMPANY would be between *** in
a combination of (a minimum of) *** in cash and the balance in stock from either
or both Nanogen, Inc. (hereinafter "Nanogen") and a publicly traded third party
company (hereinafter "THIRD PARTY"), the precise allocation of which is subject
to agreement between the parties ("the Purchase Price") from the following three
options to be decided by Nanogen:

      Option 1 - *** in cash and *** in Nanogen voting stock (total
      consideration ***;

      Option 2 - *** in cash, *** in Nanogen voting stock and *** in THIRD PARTY
      stock (or cash) (total consideration ***); or

      Option 3 - *** in cash, *** in THIRD PARTY stock (or cash, or combination
      of cash and stock to be agreed) (total consideration ***).

      The valuation of the NANOGEN stock and THIRD PARTY stock contemplated in
Options 1, 2 and 3 above shall be established based upon, and at the time of,
the Initial


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<PAGE>   132
***
May 13, 1997
Page B


Public Offering ("IPO") of NANOGEN stock. If NANOGEN selects the allocation set
forth in either Option 1 or Option 2 and NANOGEN does not conclude an IPO within
eighteen (18) months from the date of this Letter of Intent, then NANOGEN agrees
to purchase back from COMPANY the NANOGEN stock provided as part of the Purchase
Price as follows: If Option 1, NANOGEN shall purchase back the *** in NANOGEN
stock for ***. If Option 2, NANOGEN shall purchase pack the *** in NANOGEN stock
for ***. To the extent possible, the parties intend, and shall endeavor, to
structure the Contemplated Agreement as a "reorganization" pursuant to Internal
Revenue Code Section 368(a)(1)(A).

      (2)   Subject to obtaining final and formal approval ofo the proposed
transaction (including definitive documentation) by the Board of Directors of
NANOGEN, and, if necessary, the Board of Directors of THIRD PARTY, the
acquisition of the assets of COMPANY would be formalized by means of a
definitive written agreement to be executed and delivered by the parties hereto,
or by entities designated by them ("the Contemplated Agreement").

      (3)   As soon as practicable after the execution of this Letter of Intent,
NANOGEN and, to the extent required, THIRD PARTY and their respective
representatives and agents shall be permitted to make a full and complete
investigation of the assets, propoerties, business affairs and legal and
financial condition of the COMPANY ("the Due Diligence"). The parties hereby
acknowledge that the temrs and conditions of the Confidential Disclosure
Agreement between the parties, dated October 30, 1996 shall continue in full
force and effect in accordance with the terms thereof. Access to the premises
and personnel of COMPANY shall be made during business hours, with prior notice,
and under the reasonable instructions received from *** in order to ensure that
the execution of the Due Diligence activities does not alter the normal
operations of the COMPANY.

      (4)   Prior to the Expiration Date, as defined in paragraph 8 below, the
COMPANY will operate its business in the ordinary course and shall notify
NANOGEN in writing of any development, event or condition outside of the
ordinary course of business.

      (5)   Prior to the Expiration Date, as defined in paragraph 8 below,
neither the COMPANY nor any of its officers, directors, shareholders, employees
or agents shall (a) sell any of its assets, other than in the ordinary course of
busines, or sell any of the stock of COMPANY during this period, or (b)
otherwise encumber in any way the ability of COMPANY and/or NANOGEN to enter
into and /or consummate the Contemplated Agreement. In compensation for the
above, NANOGEN will make a one-time, non-refundable payment of *** to COMPANY
which will be credited toward the Purchase Price


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<PAGE>   133
***
May 13, 1997
Page B


if a Contemplated Agreement is concluded. This payment will be made to the
Company upon the signing of this Letter.

      (6)   None of the parties hereto will make any public announcement of any
transaction contemplated hereby without the written consent of the other party.

      (7)   Each of the parties shall bear its own expenses in connection with
this Letter of Intent and in connection with the execution of any Contemplated
Agreement.

      (8)   This Letter of Intent shall expire on September 15, 1997 (the
"Expiration Date"). Should the Contemplated Agreement not have been executed and
delivered before the Expiration Date, any and all agreements contained in this
Letter of Intent, with the exception of the confidentiality obligations referred
to in paragraph (3), shall be automatically terminated.

      (9)   This Letter of Intent does not constitute or create a binding
agreement (except for the agreements set forth in paragraphs 3, 4, 5, 6 and 7)
and does not indicate that an agreement exists with respect to the Contemplated
Agreement. This Letter of Intent only reflects our present understanding with
respect to the discussions we have had regarding certain proposed terms and
conditions of a Contemplated Agreement.

      (10)  The parties agree that any and all legal rights and obligations
between the parites to the Contemplated Agreement (other than the provisions
enumerated in paragraph 9 above) will arise and come into existence only when th
eContemplated Agreement is executed and deliverd by the parties thereto and only
in accordance with the terms and conditions of the Contemplated Agreement.

      (11)  This Letter of Intent shall be construed in accordance with the laws
of the State of California.


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<PAGE>   134
***
May 13, 1997
Page B


      If this Letter of Intent correctly sets forth your understanding of our
mutual intentions with respect to the Contemplated Agreement, please execute the
enclosed copyof this Letter and return it to my attention.

                                  Very truly yours,

                                  /s/ Harry J. Leonhardt

                                  Harry J. Leonhardt, Esq.
                                  General Counsel, Vice President and Secretary

HJL/dz

***

/s/ ***
----------------------------------
***, Ph.D.
President


***   CONFIDENTIAL MATERIAL REDACTED AND FILED SEPARATELY WITH THE COMMISSION.


<PAGE>   135
***
August 13, 1997
Page B


[Nanogen Letterhead]

HARRY J. LEONHARDT, ESQ.
General Counsel, Vice President and Secretary

August 13, 1997


                               VIA FEDERAL EXPRESS


***
Managing Director
***


      RE:   Offer Letter


                                  CONFIDENTIAL

Dear Peter:

      As a follow-up to our June 20 meeting in London among Nanogen, Inc.
("Nanogen"), Becton Dickinson and Company ("B-D"), *** and Caroline Popper's
subsequent meeting and discussions with representatives of *** in Japan, I have
prepared this offer letter ("Offer Letter") which sets forth the basic aspects
upon which Nanogen and B-D would be interested in acquiring certain rights from
*** to certain patent families and related agreements (collectively "the
Assets") as set forth on Appendix A. The terms of th eoffer are as follows:

      (1)   In exchange for the unrestricted assignment of all rights to the
Assets, Nanogen and B-D shall pay, collectively, to *** the following
consideration:

                                      ***

      (2)   The parties agree that the above consideration, to the extent due
and payable, shall be paid directly to ** hereby represent and warrant that they
have agreed upon terms by which the financial consideration recited in Paragraph
1(a), (b) and (c) shall be divided among them. Both *** upon acceptance and
acknowledgment of the terms and conditions of this Offer Letter, hereby forever
release, indemnify and hold harmless both Nanogen and B-D for any losses or
damages (including, without limitation, attorneys fees), relating to or arising
from any disputes, claims, disagreements, lawsuits or controversies between them
regarding the manner in which the recited consideration is allocated between
***.


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<PAGE>   136
Dr. ***
August 13, 1997
Page B


      (3)   Subsequent to obtaining final and formal approval of the proposed
transaction (including definitive documentation) by the Board of Directors of
Nanogen and, if necessary, the Board of Directors of B-D, the acquisition of the
Assets would be formalized by means of a definitive written agreement(s) to be
executed and delivered to the parties hereto, or by entities designated by them
("the Contemplated Agreement").

      (4)   At all times prior to the Closing Date, *** will continue to operate
its business relating to the Assets in the ordinary course and will not in any
way alter, change or otherwise affect the Assets or *** rights and in to the
Assets. In the event any development arises which impacts or affects the Assets
or *** rights in and to the Assets in any way prior to the closing date, as
defined below, *** shall promptly notify Nanogen and B-D in writing.
Notwithstanding the foregoing, *** will continue to pursue the foreign patent
filings and continue to diligently prosecute applications for all patent
families recited in Paragraph 1 above in the ordinary course and pay all
application and maintenance fees and prosecution expenses. Furthermore, *** will
continue to fulfill all obligations and responsibilities relating to or arising
from all *** agreements relating to the patent families recited in Paragraph 1
above.

      (5)   Execution of the Contemplated Agreement shall be subject to the
completion of certain closing conditions ("Conditions of Closing") as
hereinafter set forth. It is the intention of the parties that the completion of
all Conditions of Closing and the execution of the Contemplated Agreement(s)
shall occur on or before October 1, 1997 ("the Closing Date").

      (6)   Prior to the Closing Date, neither *** nor any of its officers,
directors, shareholders, employees or agents shall sell, mortgage or otherwise
encumber any of the Assets, or otherwise encumber in any way the ability of ***
and/or Nanogen and/or B-D to enter into or consummate any Contemplated
Agreement.

      (7)   As a Condition of Closing, *** shall provide Nanogen and B-D on or
before August 20 with a report detailing the countries in which each application
has bene or will be filed and the current status of prosecution of each case in
each country.

     (8)   *** shall be responsible for all legal, administrative and
maintenance expenses associated with the continuing prosecution, foreign filing,
and maintenance of the subject patent applications and for all services
rendered in connection with the Assets up the effective date of the
Contemplated Agreement.

     (9)  Upon the effective date of the Contemplated Agreement, responsibility
for prosecution of the subject patent applications shall shift to Nanogen and
B-D. Nanogen and B-D shall thereafter be responsible for payment of expenses
for all legal, administrative and maintenance services in connection with the
subject patent applications rendered after the effective date of the
Contemplated Agreement. For the avoidance of doubt, neither Nanogen nor B-D
shall be responsible for any expenses associated with ***, ***, which are
assigned to ***.

    (10)  *** represents and warrants that it has obtained all necessary
consents from third parties to assign all rights in and to the Assets to
Nanogen and B-D. As a Condition of Closing, *** shall deliver to Nanogen and
B-D all such consents in form and content acceptable to Nanogen and B-D. ***
shall, at no cost, assist Nanogen and B-D and cooperate in all reasonable
respects, including signing all documents necessary or desirable in order to
effect the transfer and assignment of all rights in and to the Assets to
Nanogen and B-D.

    (11)  As a Condition of Closing, Nanogen and B-D shall have reached
agreement with *** on mutually acceptable licensing terms respecting the ***
and related rights licensed by *** to ***. *** shall deliver to Nanogen and B-D
a written statement which outlines the extent to which the exclusive option to
secure certain license rights (with the right to grant third party sublicenses)
granted to *** as reflect in the July 31, 1996 letter from *** to *** remains
operative. *** position during our discussions has been that *** no longer has
any option rights as recited in paragraph 1 of that letter. As a Condition of
Closing, both *** and ***, shall represent and warrant that there are no
outstanding disputes or controversies between them relating to any ***
Agreement or letter of intent including, without limitation, the March 21, 1996
Letter of Intent and the July 31, 1996 letter from ***. The Contemplated
Agreement shall contain an indemnification clause whereby *** on behalf of
itself and its affiliates, indemnifies and holds harmless both Nanogen and B-D
against any losses or damages (including, without limitation, attorneys fees)
relating to or arising from any disputes, claims, disagreements, lawsuits or
controversies between *** and either Nanogen or B-D regarding 



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<PAGE>   137
***
August 13, 1997
Page Four


any agreement, letter of intent or understanding between SGL and Sosei. As a
further Condition of Closing, Sosei must agree to sign a covenant not to sue
for the benefit of Nanogen and B-D.

     (12) As a Condition of Closing, the parties to the October 10, 1996 Deed
Agreement ("the Deed Agreement") among *** have agreed to cause and shall cause
said Deed Agreement to terminate in all respects. Nanogen and B-D shall arrange
to commence discussions with *** regarding a possible consulting arrangement. As
a further Condition of Closing, Nanogen and *** shall have reached agreement on
mutually acceptable terms to a consulting agreement whereby *** and/or others
from *** shall provide consulting services to Nanogen.

     (13) The terms of this Offer Letter and the fact that an offer has been
made shall be maintained in confidence. None of the parties hereto will make any
public announcement of any transaction contemplated hereby without the written
consent of the other party. The parties may wish to make an announcement upon
the execution of a Contemplated Agreement in form and content to be agreed.

     (14) The Contemplated Agreement shall contain an indemnification clause
whereby *** and ***, on behalf of themselves and their affiliates, indemnify and
hold harmless both Nanogen and B-D against any losses or damages (including,
without limitation, attorneys fees) relating to or arising from any disputes,
claims, disagreements, lawsuits or controversies between Nanogen or B-D and any
third party regarding the Assets. ***, on behalf of themselves and their
affiliates, will also sign a covenant not to sue for the benefit of Nanogen and
B-D.

     (15) Each of the parties shall bear its own expenses in connection with
this Offer Letter and in connection with the preparation and execution of any
Contemplated Agreement.

     (16) Unless otherwise agreed between the parties in writing, should the
Contemplated Agreement not have been executed and delivered before the Closing
Date, any and all agreements contained in this Offer Letter, with the exception
of those obligations referred to in Paragraphs 13, 15, 17 and 18 shall be
automatically terminated.

     (17) This Offer Letter does not constitute or create a binding agreement
(except to the extent set forth in Paragraph 16 above) and does not indicate
that an agreement exists with respect to the Contemplated Agreement. This Offer
Letter only reflects our present understanding with respect to the discussions
we have had regarding certain proposed terms and conditions of a Contemplated
Agreement.
    
     (18) The parties agree that any and all legal rights and obligations
between the parties to the Contemplated Agreement will arise and come into
existence only when the Contemplated Agreement is executed and delivered by the
parties thereto and only in accordance with the terms and conditions of the
Contemplated Agreement.


*** CONFIDENTIAL MATERIAL REDACTED AND FILED SEPARATELY WITH THE COMMISSION.
<PAGE>   138
Dr. ***
August 13, 1997
Page Five



     (19) This Offer Letter and any Contemplated Agreement shall be construed
in accordance with the laws of the State of California.

     (20) All parties hereto possess the requisite corporate authority to sign
this Offer Letter and to enter into any Contemplated Agreement contemplated
hereby.

     Please signify your acceptance of the above terms and conditions by
executing the enclosed copy of this Offer Letter.  Please have the Offer Letter
acknowledged by P&B Consulting and return it to my attention. We can then
commence preparation of the Contemplated Agreement.



                                   Very truly yours,




                                   /s/ HARRY J. LEONHARDT
                                   -----------------------------------
                                   Harry J. Leonhardt, Esq.
                                   Vice President, General Counsel and
                                   Secretary, Nanogen, Inc.



                                   /s/ VINCENT A. FORLENZA
                                   ------------------------------------
                                   Vincent A. Forlenza
                                   President, Becton Dickinson
                                   Microbiology Systems




HJL//dz
Enclosures



cc:  Howard C. Birndorf
     Vincent A. Forlenza
     Caroline Popper, M.D., MPH
     Dean Paranicas, Esq.
     David Highet, Esq.


*** CONFIDENTIAL MATERIAL REDACTED AND FILED SEPARATELY WITH THE COMMISSION.
<PAGE>   139
Dr. ***
August 13, 1997
Page Six




AGREED AND ACCEPTED BY:

            ***
---------------------------


By: 
   ------------------------
   Dr. ***
   Managing Director




P&B LIMITED
-----------

By:
   ------------------------
   Dr. Ronald Pethig

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<PAGE>   140

                                      ***


Patent Applications as at 03 April 1997

1.      ***



        Patent Number                                   Description
--------------------------------------------------------------------------------
                                      ***



*** FIVE PAGES OF CONFIDENTIAL PATENT APPLICATION MATERIAL REDACTED AND FILED
    SEPARATELY WITH THE COMMISSION.
<PAGE>   141
                                   EXHIBIT F

                             OFFICER'S CERTIFICATE

        The undersigned, [Name], [Title] of [Name of Party], a Delaware
____________ (the "Company"), in his official capacity on behalf of the Company
does hereby certify that:

        1.      Attached hereto as Exhibit A is a complete, true and correct
copy of the Certificate of [Incorporation][Formation] of the Company as in full
force and effect on the date hereof.

        2.      Attached hereby as Exhibit B is a complete, true and correct
copy of the [By-laws][Operating Agreement] of the Company, as in full force
and effect on the date hereof.

        3.      Attached hereto as Exhibit C are complete, true and correct
copies of resolutions duly adopted by the Company's [Board of Directors][sole
member] on ________________________________; said resolutions have not been
modified or rescinded since their adoption and are in full force and effect on
the date hereof; said resolutions are the only resolutions adopted by the
[Board of Directors or any committees][sole member] thereof relating to the
execution and delivery by the Company of the [Master Agreement][General
Partnership Agreement] between the Company and [Name of other party or parties]
and the transactions contemplated thereby. No action has been taken nor is any
such action necessary by the Company's stockholders in connection therewith.

        4.      Each of the following persons has been duly and validly elected
to, and on the date hereof holds, the office indicated opposite his name, and
the signature opposite the name and title of each person is his true and
genuine signature.

Name                    Office                  Signature
----                    ------                  ---------

                                                --------------------------------

                                                --------------------------------

                                                --------------------------------

        IN WITNESS WHEREOF, I have affixed my signature this _____ day of
September, 1997.