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License Agreement [Amendment No. 2] - Mycogen Corp. and Diversa Corp.

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                               SECOND AMENDMENT

The License Agreement ("Agreement") between Mycogen Corporation ("MYCOGEN") and
Diversa Corporation ("DIVERSA"), dated December 19, 1997, was amended on March
6, 1998 ("March 6/th/ Amendment").  In order to avoid possible misunderstandings
as to the rights and obligations arising under the Agreement, as amended, the
following understandings are hereby confirmed:

1.   MYCOGEN Technology is defined in Section 1.6 of the Agreement.  MYCOGEN
     Technology includes information, techniques, data, materials and chemicals
     relating to MYCOGEN's proprietary [*****] gene expression system.  In
     particular, MYCOGEN Technology includes, but is not limited to, the host
     strains and expression plasmids of [*****] which were provided to DIVERSA
     by MYCOGEN, and all information pertaining to the use of such strains,
     including methods and materials used to cultivate these strains and recover
     Products, which were provided to DIVERSA by MYCOGEN.

2.   Pursuant to Section 11.2 of the March 6/th/ Amendment, DIVERSA agreed that
     it shall not [*****]. Consistent with the March 6th Amendment, DIVERSA will
     not [*****]. In particular, prohibited [*****] include, but are not limited
     to, [*****].

3.   Appendix A to this Second Amendment further exemplifies: (i) Know-How owned
     or Controlled by MYCOGEN, which is included in the definition of MYCOGEN
     Technology in the Agreement, and (ii) [*****],as described in the March
     6/th/ Amendment.

4.   [*****].  DIVERSA shall promptly disclose to MYCOGEN any such [*****].
     MYCOGEN shall have the right to use such [*****].

5.   The license granted to DIVERSA under the MYCOGEN Technology, pursuant to
     Section 2.1 of the Agreement, is to use the System to produce, make, have
     made, use, offer for sale, sell and import Product(s) and other enzymes.
     The System is defined in Section 1.8 of the Agreement to mean MYCOGEN's
     proprietary [*****] gene expression system, including the host strain,
     expression plasmids, and proprietary cultivation and recovery methods
     transferred to DIVERSA by MYCOGEN under the terms of the license.  The
     license granted to DIVERSA by MYCOGEN under the Agreement, as amended on
     March 6, 1998, is limited to use of the System as defined in the Agreement.
     No rights are granted to use any [*****], except as provided in Paragraphs
     2 and 4 of this Second Amendment.  It is understood that the Agreement as
     amended does not prevent DIVERSA from using information that is both
     subject to the exceptions in Section 5.2(a) to (d) of the Agreement and not
     covered by patents owned or controlled by MYCOGEN or its Affiliates to
     independently develop gene expression systems without the aid, application
     or use of Confidential Information received from MYCOGEN.

6.   Nothing in the Agreement or the March 6/th/ Amendment shall be construed to
     grant to DIVERSA any rights in MYCOGEN's Know-how developed after December
     19, 1997, except with respect to [*****], as provided in Section 11.1 of
     the March 6/th/ Amendment,

                                       1.      *Confidential Treatment Requested
<PAGE>

     where this [*****] is Confidential Information of DIVERSA received by
     MYCOGEN and this Confidential Information is not subject to any exception
     in Section 5.2 of the Agreement.

7. This Second Amendment is a confirmation and clarification of obligations
     existing under the Agreement and March 6/th/ Amendment and as such shall be
     deemed effective as of March 6, 1998. The definitions of terms defined in
     the Agreement and March 6/th/ Amendment are incorporated herein to the
     extent such terms have not been expressly explained or clarified by this
     Second Amendment.

                            ACCEPTED AND AGREED TO:

MYCOGEN CORPORATION                        DIVERSA CORPORATION


_____________________________              ________________________________
Name:                                      Name:
Title:                                     Title:
Date:                                      Date:

                                      2.       *Confidential Treatment Requested
<PAGE>

                                  APPENDIX A

            Exemplification of MYCOGEN Technology and Improvements

"MYCOGEN Technology", as defined in the License Agreement of December 19, 1997
between MYCOGEN and DIVERSA ("Agreement"), includes, but is not limited to, the
following Know-How owned or Controlled by MYCOGEN on the Effective Date of the
License Agreement that in each case was transferred to DIVERSA by MYCOGEN under
the terms of the Agreement:

A. [*****]

B. [*****]

C. [*****]

     1.  [*****]

     2.  [*****]

     3.  [*****]

     4.  [*****]

     5.  [*****]

     6.  [*****]

     7.  [*****]

     8.  [*****]

                                      1.  *Confidential Treatment Requested
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     9.  [*****]

     10. [*****]

     11. [*****]

     12. [*****]

     13. [*****]

     14. [*****]

     15. [*****]

     16. [*****]

     17. [*****]


D.  All documentation for regulatory submissions relating to products produced
in [*****], including TSCA premanufacture notices and toxicology data

E.  Confidential Information related to business information of MYCOGEN and its
affiliates pertaining to plans for development and commercialization of [*****]
gene expression system

                                      2.  *Confidential Treatment Requested
<PAGE>

                      IMPROVEMENTS TO MYCOGEN TECHNOLOGY

[*****]

                                                                    CONFIDENTIAL

                                   AMENDMENT

March 6, 1998

Effective immediately, the License Agreement between Diversa Corporation
(hereinafter "DIVERSA"), and Mycogen Corporation (hereinafter, "MYCOGEN"),
effective December, 1997, is hereby amended as follows:

1.  Article 1 - Definitions shall be amended to include the following
definitions:

1.10      "DIVERSA Inventions" means all inventions, discoveries, [*****],
technical information and know-how, whether patentable or not made by DIVERSA's
employees or agents alone or in conjunction with employees or agents of third
parties.

1.11      "MYCOGEN Inventions" means all inventions, discoveries, [*****],
technical information and know-how, whether patentable or not, made by MYCOGEN's
employees or agents alone or in conjunction with employees or agents of third
parties.

1.12      "Joint Inventions" means all inventions, discoveries, [*****],
technical information and know-how, whether patentable or not, made jointly by
DIVERSA's and MYCOGEN's employees or agents.

2.  Article 11 - Intellectual Property Ownership shall be added to the Agreement
and shall read as follows:

11.1      Improvements to DIVERSA Know-How. [*****]

11.2      Improvements to MYCOGEN Technology. [*****]

11.3      Except as set forth in Sections 11.1 and 11.2, DIVERSA shall have
exclusive ownership and title to DIVERSA's Inventions, and MYCOGEN shall have
exclusive ownership and title to MYCOGEN's Inventions.

11.4      Except as set forth in Sections 11.1 and 11.2, DIVERSA and MYCOGEN
shall have joint ownership and title to Joint Inventions. Further, in the event
of any such Joint Invention, the parties shall grant to each other a
nonexclusive, irrevocable, royalty free license, without the right to grant
sublicenses, to make, use, import, sell, offer to sell, have made and have used
any such Invention resulting from work under this Agreement.

11.5      DIVERSA shall have the right to prepare, file, prosecute and maintain
patent applications and patents, continuations, continuations-in-part,
divisionals, reissues, additions, renewals, or extensions thereof covering
DIVERSA's Inventions, in countries and regions of its choice throughout the
world, for which DIVERSA shall bear all costs.

11.6      MYCOGEN shall have the right to prepare, file, prosecute and maintain
patent applications and patents, continuations, continuations-in-part,
divisionals, reissues, additions, renewals, or extensions thereof covering
MYCOGEN's Inventions, in countries and regions of its choice throughout the
world, for which MYCOGEN shall bear all costs.

                                      1.  *Confidential Treatment Requested
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11.7      DIVERSA shall have the right to prepare, file, prosecute and maintain
patent applications and patents, continuations, continuations-in-part,
divisionals, reissues, additions, renewals, or extensions thereof covering Joint
Inventions, in countries and regions of choice throughout the world, for which
DIVERSA and MYCOGEN shall [*****]:

          (a) [*****]

          (b) [*****]

DIVERSA shall invoice MYCOGEN for MYCOGEN's [*****], which invoice shall be paid
by MYCOGEN within [*****] days.

11.8      Each party shall provide reasonable assistance to the other party to
facilitate filing and prosecution of all patent applications and maintaining and
extending patents covering inventions and discoveries subject to this section
and shall execute all documents deemed necessary or desirable therefor.

All of the other terms and conditions of the Agreement shall remain in full
force and effect.

                                                                    CONFIDENTIAL

IN WITNESS WHEREOF, the parties have caused this instrument to be executed by
their duly authorized officers as of the day and year set forth below.

ACCEPTED AND AGREED TO:

Mycogen Corporation


/s/ Andrew L. Barnes
-------------------------------

Print Name: Andrew L. Barnes
           --------------------

Print Title: Exec. VP
            -------------------

Date:    3/10/98
     --------------------------


Diversa Corporation


 /s/ Patrick Simms
-------------------------------
Patrick Simms
Vice President

Date:    3/6/98
     --------------------------

                                      2.  *Confidential Treatment Requested
<PAGE>

                               License Agreement

     This License Agreement (the "Agreement"), dated as of December, 1997 (the
"Effective Date"), is made by and between Mycogen Corporation, a California
corporation 92121 ("MYCOGEN"), and Diversa Corporation, a Delaware corporation
having its principal offices at 10665 Sorrento Valley Road, San Diego,
California 92121 ("Diversa").

                                   Recitals

     Whereas, MYCOGEN possesses a proprietary gene expression System (as defined
below) and other proprietary rights, know-how and experience relating to gene
expression;

     Whereas, DIVERSA desires to obtain immediate access and a worldwide,
exclusive license to utilize such gene expression System to produce Product(s);
(as defined below) ;

     Whereas, MYCOGEN desires to  grant DIVERSA immediate access and a
worldwide, exclusive license to utilize such gene expression System to produce
Product(s);

     Now, Therefore, in consideration of the mutual covenants and promises set
forth in the Agreement, the parties agree as follows:

                            Article 1 - Definitions

1.1  "Affiliate" means an individual, trust, business trust, joint venture,
partnership, corporation, association or any other entity which owns, is owned
by or is under common ownership with a party. For the purposes of this
definition, the term "owns" (including, with correlative meanings, the terms
"owned by" and under common ownership with") as used with respect to any party,
shall mean the possession (directly or indirectly) of more than [*****] of the
outstanding voting securities of a corporation or comparable equity interest in
any other type of entity.

1.2  "Confidential Information" means all information and materials received by
either party from the other party pursuant to this Agreement and all information
and materials developed in the course of the Research Activities, including,
without limitation, Know-How of each party. Confidential Information disclosed
in tangible form shall be marked " Confidential," "Proprietary" or in some other
manner to indicate its confidential nature. If disclosed orally, Confidential
Information shall be designated as confidential at the time of disclosure and
reduced to a written summary by the disclosing party and shall be marked in a
manner to indicated its confidential nature and delivered to the receiving party
within [*****] days after disclosure.

1.3  "Control" means the ability to grant a license or sublicense as provided
for herein without violating the terms of any agreement with or other
arrangement with any Third Party.

1.4  "Gross Revenues" means the [*****]. For purposes of this Agreement, a
[*****] if it consists solely of [*****] and [*****] or more [*****]. [*****]
shall be calculated by multiplying [*****] by the fraction [*****].

                                      1.      * Confidential Treatment Requested












<PAGE>

1.5  "Know-How" means information, techniques, data, materials and chemicals
(whether or not patentable), including, without limitation, inventions,
techniques, practices, methods, knowledge, know-how, skill, experience, test
data, [*****], patent and legal data or descriptions, sales and [*****] data.

1.6  "MYCOGEN Technology" means the Know-How owned or Controlled by MYCOGEN
necessary or appropriate to develop, manufacture and commercialize Product(s),
including, without limitation, the Know-How relating to the System, including
the host strain and plasmid vectors.

1.7  "Product(s)" means any enzyme which is obtained by expressing any gene or
combination of genes owned by or licensed to DIVERSA using the System,
including, without limitation, any enzyme sold as an industrial enzyme or
pharmaceutical intermediate.

1.8  "System" means MYCOGEN's proprietary [*****] gene expression system used to
produce the Product(s).

1.9  "Third Party" means any entity other than DIVERSA or MYCOGEN or an
Affiliate of DIVERSA or MYCOGEN.

                           Article 2 - License Grant

2.1  License. Subject to the terms and conditions set forth herein, MYCOGEN
hereby grants to DIVERSA an exclusive, worldwide license, including the right to
grant sublicenses pursuant to section 2.2, under the MYCOGEN Technology to use
the System to produce, make, have made, use, offer for sale, sell and import
Product(s) and other enzymes, with the exception that Diversa shall not use the
System to contract manufacture any enzyme for any third party. Notwithstanding
the foregoing, MYCOGEN and its Affiliates retain the rights to use the System
for the production of enzymes, including for the production of enzymes for third
parties by MYCOGEN.

2.2  Sublicense. MYCOGEN and DIVERSA contemplate that DIVERSA may from time to
time desire to grant sublicenses to third parties to use the System to produce
Product(s) for DIVERSA to be offered for sale by DIVERSA. Accordingly, DIVERSA
shall have the right to grant one or more sublicenses to any third party to use
the System to produce Product(s), provided that any such sublicense expressly
provides that (i) the sublicensees shall have no right to sublicense the System,
and (ii) the sublicensee shall be subject in all respects to provisions in this
Agreement.

                      Article 3 - Payments And Royalties

3.1  Payments. In partial consideration for the rights granted herein, DIVERSA
shall pay to MYCOGEN a [*****], [*****] of this Agreement.

3.2  Royalty. DIVERSA shall pay to MYCOGEN a royalty equal to [*****].

3.3  [*****].

                                      2.       *Confidential Treatment Requested
<PAGE>

3.4  Duration of Royalty Obligations. Royalty obligations shall continue [*****]

3.5  Reduction in Royalty Rate. In the event that DIVERSA is or becomes
obligated to pay additional royalties to MYCOGEN or any third party under
separate license agreement(s) for use of the System, then up to [*****] of the
additional or third party royalties owed shall be credited against royalties
owed to MYCOGEN under the terms of this Agreement. In no event, however, shall
the royalty obligation owed to MYCOGEN be reduced below [*****] of Gross
Revenues of the Product(s) for any relevant royalty payment period.

                       Article 4 - Payments and Reports

4.1  Semi-Annual Payments. Royalties shall be calculated on a [*****] basis, and
payable within [*****] after the end of each [*****] based upon Gross Revenues
during the previous [*****] All payments will be made in U.S. Dollars. The
exchange rate for conversion of any currency to U.S. Dollars will be the
exchange rate prevailing at Citibank N.A. in New York for the last business day
of each such [*****] period. Interest will be paid on the outstanding balance of
any late payments at the prime rate of interest reported by Citibank, N.A. in
New York, as such rate may change from time to time plus [*****] per annum from
the due date until the date that such payment in full is actually received.
DIVERSA will assume the risk of any inconvertibility of any currency.

4.2  Reports. DIVERSA shall furnish to MYCOGEN, at the same time as each royalty
payment is due, a written report of Gross Revenues of each Product and the
royalty due and payable, for the [*****] upon which the royalty payment is
based.

4.3  Records. DIVERSA shall keep full, complete and proper records and accounts
of Gross Revenues of each Product, in sufficient detail to enable the royalties
payable to MYCOGEN to be determined. Upon reasonable notice to DIVERSA, MYCOGEN
shall have the right through an independent certified public accountant to audit
DIVERSA's records pertaining to the Product(s) during normal business hours to
verify the royalties payable pursuant to this Agreement; provided, however, that
such audit shall not take place more often than [*****] a year and shall not
cover such records for more than the preceding [*****] and provided further that
such accountant shall report to MYCOGEN only as to the accuracy of the royalty
reports and payments submitted by DIVERSA to MYCOGEN hereunder. Such audit shall
be at MYCOGEN expense; provided, however, in the event the audit discloses that
MYCOGEN was underpaid royalties by at least [*****] for any [*****] then DIVERSA
shall reimburse MYCOGEN for audit costs together with an amount equal to the
additional royalties to which MYCOGEN is entitled. DIVERSA shall preserve and
maintain all such records and accounts required for audit for a period of
[*****] after the [*****] for which the record applies.

                          Article 5 - Confidentiality

5.1  Nondisclosure. During the Term of this Agreement, and for a period of
[*****] thereafter, each party will maintain all Confidential Information as
confidential and will not disclose any Confidential Information to any Third
Party or use any Confidential Information for any purpose except (a) as
expressly authorized by this Agreement, (b) as required by law or court order,
or (c) to its Affiliates. Each party may use such Confidential Information only
to the

extent required to accomplish the purposes of this Agreement. Each party will
use at least the same standard of care as it uses to protect proprietary or
confidential information of its own to ensure that its Affiliates, employees,
agents, consultants and other representatives do not disclose or make any
unauthorized use of the Confidential Information. Each party will promptly
notify the other upon discovery of any unauthorized use or disclosure of the
Confidential Information.

5.2  Exceptions. Confidential Information shall not include any information
which the receiving party can prove by competent evidence:

                                      3.       *Confidential Treatment Requested
<PAGE>

     a)  is now, or hereafter becomes, through no act or failure to act on the
         part of the receiving party, generally known or available;

     b)  is known by the receiving party at the time of receiving such
         information, as evidenced by its records;

     c)  is hereafter furnished to the receiving party by a Third Party, as a
         matter of right and without restriction on disclosure;

     d)  is independently developed by the receiving party without the aid,
         application or use of Confidential Information; or

     e)  is the subject of a written permission to disclose provided by the
         disclosing party.

             Article 6 - Representations, Warranties And Covenants

6.1  Corporate Power. Each party hereby represents and warrants that such party
is duly organized and validly existing under the laws of the state of its
incorporation and has full corporate power and authority to enter into this
Agreement and to carry out the provisions hereof.

6.2  Due Authorization. Each party hereby represents and warrants that such
party is duly authorized to execute and deliver this Agreement and to perform
its obligations hereunder.

6.3  Binding Agreement. Each party hereby represents and warrants that this
Agreement is a legal and valid obligation binding upon it and is enforceable in
accordance with its terms. The execution, delivery and performance of this
Agreement by such party does not conflict with any agreement, instrument or
understanding, oral or written, to which it is a party or by which it may be
bound, nor violate any law or regulation of any court, governmental body or
administrative or other agency having authority over it.

6.4  Disclaimer Of Warranties By Mycogen. EXCEPT AS EXPRESSLY SET FORTH IN THIS
AGREEMENT, MYCOGEN DOES NOT MAKE ANY REPRESENTATION OR WARRANTY TO DIVERSA OF
ANY NATURE, EXPRESS OR IMPLIED, THAT THE SYSTEM WILL BE USEFUL FOR, OR ACHIEVE
ANY PARTICULAR RESULTS. MYCOGEN SPECIFICALLY DISCLAIMS ANY WARRANTY OF
NONINFRINGEMENT, MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

                       Article 7 - Term And Termination

7.1  Term. This Agreement shall commence as of January 1, 1998, and shall
continue unless terminated in accordance with the terms of this Agreement.

7.2  Termination for Cause. Either party may terminate this Agreement upon 60
days written notice upon the occurrence of any of the following:

     a)  Upon or after the bankruptcy, insolvency, dissolution or winding up of
         the other party (other than dissolution or winding up for the purposes
         of reconstruction or amalgamation); or

     b)  Upon or after the breach of any material provision of this Agreement by
         the other party if the breaching party has not cured such breach or
         diligently proceeded to cure such breach within the 60 day period
         following written notice of termination by the other party.

7.3  Effects of Termination. Expiration or termination of this Agreement shall
not relieve the parties of any obligation accruing prior to such expiration or
termination. The provisions of Sections 4.3, 6.4 and 7.3 and Articles 5, 8 and 9
shall survive termination or expiration of this Agreement.

                        Article 8 - Dispute Resolution

8.1  Disputes. The parties recognize that disputes as to certain matters may
from time to time arise which relate to either party's rights and/or obligations
hereunder. It is the objective of the parties to

                                      4.

<PAGE>

establish procedures to facilitate the resolution of such disputes in an
expedient manner by mutual cooperation and without resort to litigation. To
accomplish this objective, the parties agree to follow the procedures set forth
in this Article 8 if and when such a dispute arises between the parties.

8.2  Procedure. If a dispute arises between the parties relating to the
interpretation or performance of this Agreement or the grounds for the
termination thereof, the parties agree to hold a meeting, attended by
individuals with decision-making authority regarding the dispute, to attempt in
good faith to negotiate a resolution of the dispute prior to pursuing other
available remedies. If, within [*****] days after such meeting, the parties have
not succeeded in negotiating a resolution of the dispute, such dispute shall be
finally settled only in San Diego, California, in accordance with the rules and
procedures of the American Arbitration Association by [*****] arbitrators
knowledgeable as to biotechnology industry standards. Each party shall select
[*****] arbitrator within [*****] days after the institution of the arbitration
proceeding and the [*****] arbitrator will be selected by mutual agreement of
the other [*****] arbitrators within [*****] days of the appointment of the
[*****] arbitrators selected by the parties. All of the arbitrators will be
neutral, impartial, independent of the parties and others having any known
interest in the outcome; will abide by the ABA and AAA Cannons of Ethics for
neutral arbitrators, and will have no ex parte communications about the case or
about the appointment of the [*****] arbitrator or the arbitrator's views on
matters of law with either party in the appointing process or otherwise during
the pendency of the arbitration. The parties shall bear the costs of arbitration
equally unless the arbitrators, pursuant to their right, but not their
obligation, require the non-prevailing party to bear all or any unequal portion
of the prevailing party's costs. The arbitrators shall prepare and deliver a
written, reasoned opinion conferring their decision within [*****] days of the
final arbitration hearing. The arbitrators shall not have the power to award
punitive damages under this Agreement and such an award is expressly prohibited.
The decision of the arbitrators shall be final and binding on all of the
parties. Judgment on the award so rendered may be entered in any court of
competent jurisdiction at the option of the successful party. The rights and
obligations of the parties to arbitrate any dispute relating to the
interpretation or performance of this Agreement or the grounds for the
termination thereof shall survive the expiration or termination of this
Agreement for any reason.

                   Article 9 - Indemnification And Insurance

9.1   Patent Infringement Indemnification. DIVERSA will at all times during the
term of this Agreement and thereafter, indemnify, defend and hold harmless
MYCOGEN and its directors, officers, employees, and affiliates, against any
claim, proceeding, demand, liability, or expense (including legal expenses and
reasonable attorney's fees) which relates to any action brought by a third party
alleging infringement of a U.S. or foreign patent as a result of the activities
of DIVERSA under this Agreement, except to the extent that such alleged
infringement is the direct result of an activity of MYCOGEN.

MYCOGEN will at all times during the term of this Agreement and thereafter,
indemnify, defend and hold harmless DIVERSA and its directors, officers,
employees, and affiliates, against any claim, proceeding, demand, liability, or
expense (including legal expenses and reasonable attorney's fees) which relates
to any action brought by a third party alleging infringement of a U.S. or
foreign patent as a result of the activities of MYCOGEN under this Agreement,
except to the extent that such alleged infringement is the direct result of an
activity of DIVERSA.

9.2   Product Liability Indemnification. DIVERSA will at all times during the
term of this Agreement and thereafter, indemnify, defend and hold harmless
MYCOGEN and its directors, officers, employees, and affiliates, against any
claim, proceeding, demand, liability, or expense (including legal expenses and
reasonable attorney's fees) which relates to injury to persons or property, or
against any other claim, proceeding, demand, expense and liability of any kind
whatsoever resulting from the production, manufacture, sale, use, lease,
consumption or advertisement of Product(s), except to the extent that such
alleged infringement is the direct result of an activity of MYCOGEN.

9.3   Obligation of Agents.  DIVERSA will require all agents who are involved
with the development, manufacturing, use or sale of Product(s), process or
service relating to this Agreement to provide the same level of indemnification
as set forth in this section.

                                      5.       *Confidential Treatment Requested

<PAGE>

9.4   Survival.  This Clause 9 will survive expiration or termination of this
Agreement.

                          Article 10 - Miscellaneous

10.1  Assignment.

          (a)  Neither party will have the right to assign its rights or
      obligations under this Agreement with the prior written consent of the
      other party. Any attempted assignment in violation of this provision will
      be void. However, this Agreement shall survive any merger, reorganization
      or sale of all or substantially all of the assets of either party with or
      into another party and no consent for such transaction shall be required
      hereunder; provided, however, that in the event of such transaction, no
      intellectual property rights of the acquiring corporation shall be
      included in the technology licensed hereunder.

          (b) This Agreement shall be binding upon and inure to the benefit of
      the successors and permitted assigns of the parties. Any assignment not in
      accordance with this Agreement shall be void.

10.2  Force Majeure. Neither party shall lose any rights hereunder or be liable
to the other party for damages or losses on account of failure of performance by
the defaulting party if the failure is occasioned by government action, war,
fire, explosion, flood, strike, lockout, embargo, act of God, or any other
similar cause beyond the control of the defaulting party; provided, however,
that the party claiming force majeure has exerted all reasonable efforts to
avoid or remedy such condition.

10.3  Notices. Any notices or communications provided for in this Agreement to
be made by either of the parties to the other shall be in writing and delivered
personally or sent by United States mail, registered or certified, postage paid,
by overnight delivery service such as FedEx or UPS or by facsimile, with
confirmation of receipt, addressed as follows:

      If to DIVERSA:

          Diversa Corporation
          10665 Sorrento Valley Road
          San Diego, CA 92121
          Attn: [*****]

      If to MYCOGEN:

          MYCOGEN Corporation
          5501 Oberlin Drive
          San Diego, CA 92121
          Attn: [*****]

Either party may by like notice specify or change an address to which notices
and communications shall thereafter be sent. Notices sent by facsimile shall be
effective upon confirmation of receipt, notices sent by mail or overnight
delivery service shall be effective upon receipt, and notices given personally
shall be effective when delivered.

10.4  Governing Law. This Agreement shall be governed by, construed and enforced
in accordance with the laws of the State of [*****], as such laws are applied to
contracts entered into and to be performed entirely within the State of [*****]
by [*****] residents.

                                      6.       *Confidential Treatment Requested

<PAGE>

10.5  Waiver. Except as specifically provided for herein, the waiver from time
to time by either of the parties of any of their rights or their failure to
exercise any remedy shall not operate or be construed as a continuing waiver of
same or of any other of such party's rights or remedies provided in this
Agreement.

10.6  Severability. If any term, covenant or condition of this Agreement or the
application thereof to any party or circumstance shall, to any extent, be held
to be invalid or unenforceable, then (a) the remainder of this Agreement, or the
application of such term, covenant or condition to parties or circumstances
other than those as to which it is held invalid or unenforceable, shall not be
affected thereby and each term, covenant or condition of this Agreement shall be
valid and be enforced to the fullest extent permitted by law; and (b) the
parties hereto covenant and agree to renegotiate any such term, covenant or
application thereof in good faith in order to provide a reasonably acceptable
alternative to the term, covenant or condition of this Agreement or the
application thereof that is invalid or unenforceable, it being the intent of the
parties that the basic purposes of this Agreement are to be effectuated.

10.7  Independent Contractors. It is expressly agreed that DIVERSA and MYCOGEN
shall be independent contractors and that the relationship between the two
parties shall not constitute a partnership or agency of any kind. Neither
DIVERSA nor MYCOGEN shall have the authority to make any statements,
representations or commitments of any kind, or to take any action, which shall
be binding on the other, without the prior written authorization of the party to
do so.

10.8  Entire Agreement; Amendment. This Agreement sets forth all of the
covenants, promises, agreements, warranties, representations, conditions and
understandings between the parties hereto, and supersedes and terminates all
prior agreements and understanding between the parties with respect to the
subject matter hereof. There are no covenants, promises, agreements, warranties,
representations conditions or understandings, either oral or written, between
the parties other than as set forth herein and therein. No subsequent
alteration, amendment, change or addition to this Agreement shall be binding
upon the parties hereto unless reduced to writing and signed by the respective
authorized officers of the parties.

10.9  Counterparts. This Agreement may be executed in two or more counterparts,
each of which shall be deemed an original, but all of which together shall
constitute one and the same instrument.

                                      7.

<PAGE>

     In Witness Whereof, the parties have executed this License Agreement as of
the date first set forth above.

Mycogen Corporation                               Diversa Corporation


By: /s/ Andrew C. Barnes                           /s/ Patrick Simms
   ----------------------------------             ------------------------------
                                                  Patrick Simms
Name:   Andrew C. Barnes                          Vice President
     --------------------------------

Title:    Exec. VP
      -------------------------------

                                      8.