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Therapeutic Collaboration and License Agreement - Human Genome Sciences Inc., Schering Corp., Schering Plough Ltd., SmithKline Beecham Corp. and SmithKline Beecham plc

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                THERAPEUTIC COLLABORATION AND LICENSE AGREEMENT

     This Agreement  ("Agreement"),  effective as of the 28th of June, 1996 (the
"EFFECTIVE  DATE"),  by and among Human Genome  Sciences,  Inc.,  a  corporation
organized  under the laws of the State of  Delaware,  United  States of America,
having a place of business at 9410 Key West Avenue,  Rockville,  Maryland 20850,
for itself and its  AFFILIATES,  as defined below  (collectively  including such
AFFILIATES "HGS"), Schering Corporation,  a corporation organized under the laws
of the State of New Jersey, United States of America, having a place of business
at 2000 Galloping Hill Road,  Kenilworth,  New Jersey 07033, and Schering Plough
Ltd.,  a  Swiss   corporation   having  its  principal   place  of  business  at
Toepferstrasse  5,  CH-6004  Lucerne,  Switzerland,  each  for  itself  and  its
AFFILIATES,  as defined below (collectively including such AFFILIATES "SP"), and
SmithKline Beecham  Corporation,  a corporation  organized under the laws of the
Commonwealth  of  Pennsylvania,  United  States  of  America,  having a place of
business  at 709  Swedeland  Road,  King of  Prussia,  Pennsylvania,  19406  and
SmithKline  Beecham,  plc,  having  a place of  business  at  Great  West  Road,
Brentford, Middlesex, U.K.
                                WITNESSETH THAT:
                                ----------------

     WHEREAS HGS is in possession of certain human gene sequence information and
has the  capacity  and  ability to rapidly  obtain  full or  meaningful  partial
sequence data for expressed human genes,
         WHEREAS,   HGS  and  SB  (as  defined   below)  have   entered  into  a
COLLABORATION AGREEMENT relating to sequencing of human genes and development of
practical applications

therefor  and have  amended  such  COLLABORATION  AGREEMENT  to  permit  them to
collaborate with and grant certain rights to SP.
     WHEREAS  SP is a  multinational  human  healthcare  company  which  has the
capacity and ability to develop  practical  applications in the human healthcare
field of the gene sequence data in the  possession of or within the capacity and
ability of HGS to obtain,
     WHEREAS  HGS, SB and SP wish to grant  rights to each other with respect to
developing human therapeutic products.
     NOW, THEREFORE, in consideration of the covenants and obligations expressed
herein,  and intending to be legally bound,  and otherwise to be bound by proper
and reasonable conduct, the parties agree as follows:

1.   DEFINITIONS
     -----------

         1.1  "AFFILIATES"  shall  mean any  individual  or entity  directly  or
indirectly  controlling,  controlled  by  or  under  common  control  with,  the
specified  individual or entity.  For purposes of this Agreement,  the direct or
indirect  ownership  of over  fifty  percent  (50%)  of the  outstanding  voting
securities of an entity, or the right to receive over fifty (50%) of the profits
or  earnings  of an entity  shall be deemed to  constitute  control.  Such other
relationship  as in fact gives such individual or entity the power or ability to
control the  management,  business and affairs of an entity shall also be deemed
to constitute control.
         1.2  "ANTIBODY   PRODUCT"   shall  mean  an  antibody   (monoclonal  or
polyclonal)  or  fragments  or  constructs  thereof  in the SP  FIELD  which  is
potentially  useful for the  treatment or prevention of a disease or disorder in
humans.
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         1.3  "ANTIBODY  RESEARCH  PLAN" shall mean a plan for  developing an SP
ANTIBODY PRODUCT. A representative sample of such a plan is shown in Appendix A.
         1.4 "ANTISENSE"  shall mean inhibiting or preventing in vivo expression
in a human or animal of a gene product by use of an  oligonucleotide or modified
oligonucleotide which binds to RNA or DNA to prevent and/or impair expression of
the gene product.
         1.5 "BLOCKING CLAIM" shall mean a claim under any patent application or
granted  patent  anywhere in the world which  generically  but not  specifically
claims (i) any and all compounds (and/or the use thereof) which interact with or
prevent interaction with a specified TARGET which is a PRODUCT (i.e., an omnibus
claim)  and/or (ii) any and all  antibodies  (and/or the use thereof)  against a
specified  THERAPEUTIC  PROTEIN  (i.e.,  an omnibus  claim).  The  following are
representative  but not  exclusive  examples  of claim  language  for  "BLOCKING
CLAIMS":  (1) a compound  which  interacts with receptor X; (2) a compound which
prevents binding between receptor X and its ligand, (3) a process for activating
receptor  X,  comprising:  contacting  receptor  X with a compound  which  binds
thereto and activates the receptor;  (4) a process for preventing  activation of
receptor X  comprising  contacting  receptor X with a  compound  which  prevents
binding between  receptor X and its ligand , and (5) a compound which is capable
of interacting with a receptor X.
         1.6 "cDNA" shall mean  complementary  DNA prepared from human messenger
RNA.
         1.7  "COLLABORATION  AGREEMENT" shall mean the Collaboration  Agreement
entered  into between SB and HGS  effective  as of May 19,  1993,  as amended or
superseded  from  time to time,  a copy of the  version  to be in  effect on the
EFFECTIVE DATE having been provided to SP prior to the EFFECTIVE DATE.

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         1.8  "COLLABORATION  PARTNER"  shall mean those  entities which are set
forth in  Appendix B and any entity  added to Appendix B or  substituted  for an
entity in Appendix  B,  pursuant  to the terms of the  COLLABORATION  AGREEMENT,
provided that the aggregate of COLLABORATION PARTNERS shall be no more than four
entities at any one time.
         1.9   "COLLABORATION   BLOCKING   PATENT"  means  a  patent  or  patent
application  filed  prior to the end of the  INITIAL  RESEARCH  TERM  owned by a
COLLABORATION  PARTNER,  SB,  or HGS  only  to the  extent  that it  includes  a
"BLOCKING  CLAIM" and as to which HGS and/or SB has the right to grant a license
to   SP.    Included    within   the   definition    are   all    continuations,
continuations-in-part,  divisions,  patents  of  addition,  reissues,  renewals,
extensions,   registrations,    confirmations,    reexaminations,    provisional
applications, SPCs.
         1.10  "COLLABORATION  PATENT"  means a  COLLABORATION  BLOCKING  PATENT
and/or COLLABORATION TARGET PATENT and/or COLLABORATION PROTEIN PATENT.
         1.11   "COLLABORATION   PROTEIN   PATENT"  means  a  patent  or  patent
application  filed  prior to the end of the  INITIAL  RESEARCH  TERM  owned by a
COLLABORATION  PARTNER,  SB,  or HGS  only  to  the  extent  that  it  claims  a
THERAPEUTIC  PROTEIN which is a PRODUCT  and/or the  manufacture  or use of such
THERAPEUTIC  PROTEIN  and as to which  HGS  and/or  SB has the  right to grant a
license  to  SP.   Included   within  the  definition  are  all   continuations,
continuations-in-part,  divisions,  patents  of  addition,  reissues,  renewals,
extensions,   registrations,    confirmations,    reexaminations,    provisional
applications, SPCs.
         1.12  "COLLABORATION   TARGET  PATENT(S)"  means  a  patent  or  patent
application  filed  prior to the end of the  INITIAL  RESEARCH  TERM  owned by a
COLLABORATION
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PARTNER,  SB,  or HGS only to the  extent  that it  claims  a TARGET  which is a
PRODUCT and/or the  manufacture or use thereof and as to which HGS and/or SB has
the right to grant a license  to SP.  Included  within  the  definition  are all
continuations, continuations-in-part,  divisions, patents of addition, reissues,
renewals, extensions, registrations, confirmations,  reexaminations, provisional
applications, SPCs.
         1.13  "DIAGNOSTIC(S)"  shall  mean  any  product,  process,  substance,
composition  or service  intended  to  predict,  detect or identify a disease or
determine the presence of a pathologic condition in a human.
         1.14  "DISCOVERED"  shall mean with  respect to any  product,  process,
substance,  composition or service,  the earlier of the following events (i) the
specific disclosure of such product, process, substance,  composition or service
in a patent  application  filed by the  discovering  party or (ii) the  specific
disclosure of such product,  process,  substance,  composition or service by the
discovering  party  in a  written  document  (including,  but  not  limited  to,
laboratory notebooks) other than a filed patent application.
         1.15 "DRUG  PRODUCT"  shall mean a PRODUCT  (other  than a  THERAPEUTIC
PROTEIN or ANTIBODY PRODUCT) in the SP FIELD which is potentially useful for the
treatment or prevention of a disease or disorder in humans.
         1.16 "DRUG RESEARCH PLAN" shall mean a plan for developing  screens for
and  screening  of TARGETS to  discover  an SP DRUG  PRODUCT.  A  representative
example of such a plan is shown in Appendix A.
         1.17 "EFFECTIVE DATE" shall mean the date first above written.
         1.18  "EXTENDED  TERM"  shall  mean the  additional  period  defined in
Paragraph 4.2.
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         1.19  "GENE"  shall  mean a human  gene or a  portion  thereof  or cDNA
corresponding thereto.
         1.20 "GENE THERAPY" shall mean treatment or prevention of a disease, or
remedying  a gene  deficiency  of humans or animals by genetic  modification  of
human  somatic  cells or animal  somatic or germ cells (in vivo,  in vitro or ex
vivo)   with  DNA  (RNA)  for  the   purpose   of   expressing   a  protein   or
oligo(poly)nucleotide encoded by said DNA (RNA) in a human or animal.
         1.21  "GENE  THERAPY  VACCINE"  shall mean a VACCINE  which  achieves a
therapeutic  effect by  inducing an  antigen-specific  humoral  and/or  cellular
immune system response by GENE THERAPY.
         1.22 "HGS FIELD" shall mean: (i) GENE THERAPY,  (ii)  ANTISENSE,  (iii)
biotransformation  of a chemical to prepare  pharmaceutically  active agents for
human  or  animal  use,  or  intermediates  therefor,  which  active  agent  was
DISCOVERED before the EFFECTIVE DATE; and (iv) DIAGNOSTICS.
         1.23 "HGS PATENT(S)" shall mean all patents and patent  applications to
the extent that they claim HGS  TECHNOLOGY  and which are or become owned by HGS
or to  which  HGS  otherwise  has,  now or in the  future,  the  right  to grant
licenses.  Included within the definition of HGS PATENTS are all  continuations,
continuations-in-part,  divisions,  patents of  addition,  reissues,  renewals ,
extensions  registrations,   confirmations,   re-examinations  thereof  and  any
provisional applications and all SPCs.
         1.24 "HGS TECHNOLOGY" shall mean, the following which is provided to SP
by or on behalf of HGS:  (a)  sequence  data with  respect to human DNA (and the
corresponding
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clones) and expression  products thereof, in each case developed by or on behalf
of HGS  prior to or  during  the  INITIAL  RESEARCH  TERM,  (b)  information  on
biological  function  of TARGETS and  THERAPEUTIC  PROTEINS  developed  by or on
behalf of HGS prior to the INITIAL RESEARCH TERM, and (c) HGS clones, cell lines
and  vectors,  and all  information  and data  provided to SP by HGS pursuant to
Section 6 hereof, and (d) SOFTWARE.
         1.25  "INITIAL  RESEARCH  TERM"  shall mean the term  beginning  on the
EFFECTIVE DATE and ending five years (5) from the EFFECTIVE DATE.
         1.26  "LICENSED  PATENT(S)"  means  HGS  PATENT(S)  and/or  SPECIAL  SB
PATENT(S).
         1.27  "LICENSED  TECHNOLOGY"  means HGS  TECHNOLOGY  and/or  SPECIAL SB
TECHNOLOGY.
         1.28 "MAJOR MARKET" means the United States,  Canada,  Germany,  United
Kingdom, France, Italy or Japan.
         1.29 "MERCK" shall mean Merck KGaA and its AFFILIATES.
         1.30 "NET SALES" shall mean proceeds actually received from sales of SP
PRODUCT  (calculated  on a SP PRODUCT by SP PRODUCT  basis) by SP or,  except as
provided below, its respective  licensees,  distributors trading on SP's account
or joint  ventures  or  other  associated  companies,  less  deductions  for (i)
transportation, shipping and postage charges, including transportation insurance
and  customs  duties to the extent  separately  invoiced;  (ii) sales and excise
taxes and duties paid or allowed by a selling  party and any other  governmental
charges imposed upon the production, importation, use or sale of such SP PRODUCT
(including value added taxes or other governmental charges otherwise measured by
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the billing amount when included in billing);  (iii) normal and customary trade,
quantity and cash discounts allowed and charge back payments and rebates granted
to managed health care organizations or to federal, state and local governments,
their  agencies and  purchasers  and  reimbursees,  including but not limited to
Medicaid  rebates  or  to  trade   customers,   including  but  not  limited  to
wholesalers,  chain and pharmacy  buying  groups;  (iv) rebates (or  equivalents
thereof)  granted  to  or  charged  by  national,   state  or  local  government
authorities  in countries  other than the United  States;  and (v) allowances or
credits to  customers  on account of  rejection  or return of such product or on
account of retroactive price reductions affecting such SP PRODUCT. Sales between
or  among  SP and  their  respective  licensees,  distributors  trading  on SP's
account,  or joint  ventures  or other  associated  companies  shall be included
within  NET SALES  only if such  purchaser  is an  end-user  of the SP  PRODUCT.
Otherwise,  NET SALES shall only  include the  subsequent,  final sales to THIRD
PARTIES.
         1.31 "PRELIMINARY ANTIBODY PLAN" shall mean a plan for developing an SP
ANTIBODY PRODUCT in the form of Appendix C.
         1.32 "PRELIMINARY  DRUG PLAN" shall mean a plan for developing  screens
for and  screening  of TARGETS  to  discover  an SP DRUG  PRODUCT in the form of
Appendix C.
         1.33  "PROTEIN  RESEARCH  PLAN"  shall  mean a plan  for  research  and
development of a THERAPEUTIC  PROTEIN which includes,  at a minimum,  scientific
data,  research and development  efforts,  research and development  milestones,
sufficient  to  reasonably  monitor  diligence of  research/development  of such
THERAPEUTIC PROTEIN . An example of such a plan is shown in Appendix D.
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<PAGE>
         1.34  "PRODUCT(S)"   shall  mean  any  product,   process,   substance,
composition  or  service  which (i) is based on the use of or  derived by use of
LICENSED  TECHNOLOGY  and/or SP TECHNOLOGY  and/or (ii) is covered by a LICENSED
PATENT and/or claim of an SP PATENT which claims SP TECHNOLOGY and/or is covered
by a  COLLABORATION  PATENT as to which SP obtains rights under this  Agreement;
and/or  (iii) is  based on or is  derived  by use of a  TARGET  and/or  use of a
THERAPEUTIC  PROTEIN  as to  which  SP  obtains  rights  under  this  Agreement.
Notwithstanding  the previous  sentence,  an  incidental  or  immaterial  use of
LICENSED TECHNOLOGY , SP TECHNOLOGY, or a TARGET or a THERAPEUTIC PROTEIN from a
COLLABORATION PARTNER and/or HGS and/or SB, shall not cause a product,  process,
substance,  composition  or  service  to become a  PRODUCT.  Appendix E contains
representative, examples of incidental or immaterial use and material use but is
not intended by the parties to be an exhaustive  list of incidental,  immaterial
and/or material uses.
         1.35 "PROOF OF EFFICACY" shall mean proof of therapeutic  effectiveness
in a Phase II(a) Clinical Test based on biostatistical  methods, that supports a
determination to proceed with expanded controlled clinical trials.  "Phase II(a)
Clinical Test" shall mean a well-controlled clinical study conducted to evaluate
the  effectiveness  of the drug for a particular  indication or  indications  in
patients  with the disease or condition  under study and to determine the common
short-term side effects and risks associated with the drug.
         1.36    "RESEARCH PLAN" shall mean individually and collectively a DRUG
RESEARCH PLAN, PROTEIN RESEARCH PLAN and ANTIBODY RESEARCH PLAN.
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         1.37 "SB" shall mean  SmithKline  Beecham  Corporation  and  SmithKline
Beecham, plc, and any past (from May 19, 1993 to the EFFECTIVE DATE), present or
future AFFILIATE thereof,  which AFFILIATE holds the relevant right and/or is or
was  or  will  be  necessary  or  required  to  perform  any  obligations  of SB
(including,   without  limitation,  those  which  have  performed  research  and
development of SPECIAL SB TECHNOLOGY)  under this Agreement  and/or to which any
of the rights and/or  obligations  of either of them are  subsequently  assigned
and/or delegated pursuant to Section 22 of this Agreement.
         1.38  "SOFTWARE"  shall mean  software  (together  with the source code
therefor and maintenance  files and  "Documentation"  as defined below) designed
and  developed by HGS prior to or during the INITIAL  RESEARCH TERM for analysis
of sequence  data with  respect to human DNA and  expression  products  thereof,
including,  without  limitation,  the specific software modules set forth in the
attached  Appendix  F.  "Documentation"  shall  include all  operating  and user
manuals, training materials guides, listings,  specifications and other material
used with the SOFTWARE.
         1.39  "SP  ANTIBODY  PRODUCT"  shall  mean a  PRODUCT  in the SP  FIELD
discovered  and/or  developed by or on behalf of SP or its licensee  which is an
ANTIBODY PRODUCT.
         1.40 "SP DRUG PRODUCT" shall mean a PRODUCT in the SP FIELD  discovered
and/or developed by or on behalf of SP or its licensee other than an SP ANTIBODY
PRODUCT and/or SP PROTEIN PRODUCT and/or a TARGET.
         1.41 "SP FIELD" shall mean the treatment  and/or  prevention of disease
in humans,  excluding  the HGS FIELD.  For  avoidance  of doubt,  in the event a
PRODUCT has both
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therapeutic  and DIAGNOSTIC  use, the  therapeutic  use of such PRODUCT shall be
included in the SP FIELD.
         1.42 "SP PATENT(s)"  shall mean all patents and patent  applications to
the extent that they claim SP TECHNOLOGY,  which are or become owned by SP or to
which SP  otherwise  has,  now or in the  future,  the right to grant  licenses.
Included   within  the   definition   of  SP  PATENT   are  all   continuations,
continuations-in-part,  divisions,  patents  of  addition,  reissues,  renewals,
extensions,  registrations,  confirmations,  re-examinations  thereof,  and  any
provisional applications and all SPCs.
         1.43"SP  PRODUCT"  means SP DRUG  PRODUCT,  SP ANTIBODY  PRODUCT and SP
PROTEIN PRODUCT.
         1.44 "SP PROTEIN PRODUCT" shall mean a PRODUCT in the SP FIELD which is
a  THERAPEUTIC  PROTEIN  as to which SP gets  rights  under  Section  7 or under
Paragraph 9.3.
         1.45 "SP/SB AGREEMENT" shall mean that certain agreement between SP and
SB referred to in Paragraph 9.2 of this Agreement.
         1.46     "SP TECHNOLOGY" shall mean:
         (i) peptides and/or  polypeptides,  and/or  polynucleotides  and/or the
sequences  thereof  and/or  antibodies  and/or  clones  or  plasmids  containing
polynucleotides  which  (a) are  based on use of  LICENSED  TECHNOLOGY  by or on
behalf of SP,  and/or (b) are  derived by use of  LICENSED  TECHNOLOGY  by or on
behalf of SP and/or;  (c) are based on and/or  derived by use by or on behalf of
SP of a TARGET and/or  THERAPEUTIC  PROTEIN as to which SP obtains  rights under
this Agreement from a COLLABORATION PARTNER or SB.
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         (ii)  therapeutic   compounds  and  potential   therapeutic   compounds
(including antibodies) developed by or on behalf of SP which are based on use of
or  derived  from use of item (i)  and/or  item (iii)  and/or  item (iv)  and/or
LICENSED TECHNOLOGY;
         (iii)  biological   information   developed  by  or  on  behalf  of  SP
specifically related to item (i) and/or item (ii) and/or LICENSED TECHNOLOGY ;
          (iv) screens  and/or  assays for  identifying  potential  therapeutics
(including  antibodies),  developed  by or on behalf of SP and which  screens or
assays are directed to and/or based on and/or  derived by use of item (i) and/or
item (iii) and/or LICENSED TECHNOLOGY;
         Items (i) through (iv) are included as SP TECHNOLOGY only to the extent
they are  obtained by or on behalf of or derived by or on behalf of SP after the
EFFECTIVE  DATE and prior to the  later of four (4)  years  after the end of the
INITIAL  RESEARCH  TERM or four (4) years  after the end of any  EXTENDED  TERM;
provided,  however,  that any of items  (i)-(iii)  which are  obtained  by or on
behalf of SP or  derived  by or on behalf of SP after such time shall also be SP
TECHNOLOGY  if it results from item (iv) within three (3) years after the screen
or assay becomes operational for use by or on behalf of SP as a screen or assay.
Notwithstanding   the  above,  an  incidental  or  immaterial  use  of  LICENSED
TECHNOLOGY  and/or a TARGET  and/or a  THERAPEUTIC  PROTEIN  shall not cause any
items (i) to (iv ) to become SP TECHNOLOGY.  Appendix E. contains representative
examples of incidental  or immaterial  use and material use, but is not intended
by the  parties  to be an  exhaustive  list  of  incidental,  immaterial  and/or
material uses.
         1.47 "SPC" shall mean a right based upon an underlying patent such as a
Supplementary Protection Certificate .
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"The  information  below marked [***] has been omitted pursuant to a request for
confidential treatment. The omitted portions have been separately filed with the
Commission."

         1.48 "SPECIAL SB PATENT(S)"  means all patents and patent  applications
to the extent that they claim SPECIAL SB TECHNOLOGY which are or become owned by
SB or to  which SB  otherwise  has,  now or in the  future,  the  right to grant
licenses.  SPECIAL SB PATENTS include all continuations,  continuations-in-part,
divisions, patents of addition,  reissues,  renewals,  extensions registrations,
confirmations,  re-examinations thereof and any provisional applications and all
SPCs.
         1.49 "SPECIAL SB TECHNOLOGY" means  [***].
         1.50 "TARGET"  shall mean a GENE or expression  product  thereof (e.g.,
receptors,  enzymes or ion channels)  which could be used for screening or other
drug  discovery  purposes to identify  compounds  or  ANTIBODY  PRODUCTS  with a
biochemical or pharmaceutical effect.
         1.51  "TERRITORY"  shall mean all the countries and  territories in the
world.
         1.52 "THIRD PARTY(IES)" shall mean any party other than a party to this
Agreement or an AFFILIATE of SP or HGS or SB.
         1.53 "THERAPEUTIC PROTEIN" shall mean a polypeptide derived from a GENE
(excluding  ANTIBODY  PRODUCTS) which is potentially useful for the treatment or
prevention of a disease or disorder in humans.
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         1.54 VACCINE" shall mean any substance which achieves a prophylactic or
therapeutic  effect by  inducing an  antigen-specific  humoral  and/or  cellular
immune system response excluding a GENE THERAPY VACCINE.

2.   SB AND HGS AND SP GRANTS AND COVENANTS
     --------------------------------------

         2.1 (a) Subject to the terms and conditions of this Agreement,  HGS and
SB, as the case may be, grant to SP a non-exclusive,  non-transferable worldwide
license under LICENSED TECHNOLOGY, LICENSED PATENTS and COLLABORATION PATENTS to
perform  research and  development  in the SP FIELD during the INITIAL  RESEARCH
TERM.
                  (b) Subject to the terms and conditions of this Agreement, HGS
and SB,  as the  case  may be,  grant  to SP a  non-exclusive,  non-transferable
worldwide license under LICENSED TECHNOLOGY,  LICENSED PATENTS and COLLABORATION
PATENTS to perform  research and development  during the EXTENDED TERM of (i) SP
DRUG  PRODUCTS,  (ii) SP  PROTEIN  PRODUCTS  , and  (iii) SP  ANTIBODY  PRODUCTS
encompassed by an ANTIBODY RESEARCH PLAN submitted by SP prior to the end of the
INITIAL RESEARCH TERM.
                  (c) Subject to the terms and conditions of this Agreement, HGS
and SB,  as the case  may be,  grant  to SP a  non-exclusive,  non-transferable,
worldwide license under LICENSED TECHNOLOGY, LICENSED PATENTS, and COLLABORATION
PATENTS to perform  research and development  after the INITIAL RESEARCH TERM of
(i) SP DRUG PRODUCTS  encompassed  by a DRUG RESEARCH PLAN submitted by SP prior
to the end of the INITIAL  RESEARCH TERM or the EXTENDED  TERM,  (ii) SP PROTEIN
PRODUCTS, (iii) SP ANTIBODY PRODUCTS encompassed by an ANTIBODY RESEARCH
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PLAN  submitted by SP prior to the end of the INITIAL  RESEARCH  TERM,  and (iv)
TARGETS which are PRODUCTS  encompassed  by a DRUG RESEARCH PLAN submitted by SP
prior to the end of the INITIAL RESEARCH TERM or the EXTENDED TERM.
         2.2 Subject to the terms and conditions of this Agreement,  HGS and SB,
as the case may be,  grant to SP a  non-exclusive  worldwide  license  under (i)
LICENSED  TECHNOLOGY,  (ii) LICENSED  PATENTS with respect to claims directed to
TARGETS  which  are  PRODUCTS  and  the  manufacture  and  use  thereof,   (iii)
COLLABORATION  BLOCKING PATENTS,  and (iv) COLLABORATION TARGET PATENTS, in each
case to make, have made,  use,  import,  export,  offer to sell and sell SP DRUG
PRODUCT  and SP  ANTIBODY  PRODUCT  in the SP  FIELD.  In the case of an SP DRUG
PRODUCT,  such  license  is limited to SP DRUG  PRODUCTS  encompassed  by a DRUG
RESEARCH PLAN  submitted by SP prior to the end of the INITIAL  RESEARCH TERM or
EXTENDED  TERM,  and in the case of an SP  ANTIBODY  PRODUCT is limited to an SP
ANTIBODY PRODUCT  encompassed by an ANTIBODY RESEARCH PLAN submitted by SP prior
to the end of the INITIAL RESEARCH TERM.
         2.3  HGS  grants  to SP an  irrevocable,  royalty-free,  non-exclusive,
non-transferable,  worldwide  license to use  SOFTWARE to perform  research  and
development  after the INITIAL  RESEARCH  TERM.  The license  granted under this
Paragraph  2.3 is limited to  SOFTWARE  which is (i) owned by HGS and/or (ii) is
owned or  licensed by a THIRD  PARTY and  licensed  to HGS which  license to HGS
includes the right to grant  sublicenses.  To the extent that  acceptance of the
license  granted  under  this  Paragraph  2.3  would  obligate  SP or HGS to pay
royalties  and/or  license  fees to a THIRD PARTY based  solely upon SP's use of
SOFTWARE
                                       15
<PAGE>
owned or licensed by said THIRD PARTY and sublicensed to SP by HGS, SP shall, in
its sole discretion elect to (i) accept the SOFTWARE in its entirety and pay all
such royalties and/or licensee fees, (ii) obtain a direct license from the THIRD
PARTY owner of the SOFTWARE,  or (iii) accept the SOFTWARE with the exception of
the THIRD PARTY SOFTWARE for which royalties and/or license fees would have been
due. To the extent that SOFTWARE  includes  software  owned or licensed by THIRD
PARTIES which is not  sublicensable  by HGS, HGS will promptly  provide  written
notice to SP identifying  all such software and its owner,  and SP  acknowledges
and agrees that it must obtain the necessary  license(s) prior to using any such
software.
         2.4 Subject to the terms and conditions of this Agreement,  HGS and SB,
as the case may be, grant to SP an exclusive  worldwide  license in the SP FIELD
under LICENSED TECHNOLOGY, LICENSED PATENTS and COLLABORATION PROTEIN PATENTS to
research,  develop, make, have made, use, import, export, offer to sell and sell
SP PROTEIN PRODUCTS,  provided,  however,  that such license shall not extend to
VACCINES  to the  extent  that  prior  to SP  obtaining  exclusive  rights  to a
THERAPEUTIC  PROTEIN under Section 7 of this Agreement,  MERCK obtains exclusive
rights  to such  THERAPEUTIC  PROTEIN  as a  VACCINE  in the SP  FIELD  under an
agreement among SB, HGS and MERCK by which MERCK obtains  exclusive  rights to a
THERAPEUTIC PROTEIN as a VACCINE by the submission of data essentially identical
to the data required to obtain  rights to a THERAPEUTIC  PROTEIN under Section 7
of this Agreement prior to SP's submission of an information package pursuant to
Section 7 of this Agreement for such THERAPEUTIC PROTEIN.
                                       16
<PAGE>
         2.5 The licenses  granted to SP under  Paragraphs 2.1, 2.2, 2.4 and 2.6
shall be  sublicensable  by SP but only in accordance  with Paragraphs 2.8, 2.9,
2.10, 10.3 and 10.4.
         2.6 In the event that a SP PRODUCT is  DISCOVERED by or on behalf of SP
which is not  encompassed by a RESEARCH PLAN and for which  royalties are due to
HGS  under  this  Agreement,  SP  may  request  in  writing  that  HGS  grant  a
non-exclusive  license  in the SP  FIELD  under  HGS  PATENTS  covering  such SP
PRODUCT.  HGS shall grant such a license,  to the extent that it has the ability
to do so, provided, however, that HGS can refuse to grant the license if, at the
time of receipt of the request  from SP, HGS has an ongoing  program of research
and  development  for a  PRODUCT  which  is  "essentially  the  same" as such SP
PRODUCT.  For purposes of this Paragraph,  the term "essentially the same" shall
mean that an SP PRODUCT and a PRODUCT being  developed by HGS are  substantially
the same  chemical  entity,  for  example,  a  THERAPEUTIC  PROTEIN and a mutein
thereof.
         2.7  Notwithstanding any exclusive rights granted to SP with respect to
a THERAPEUTIC PROTEIN, SP acknowledges and agrees that HGS, SB and COLLABORATION
PARTNERS,  as the case may be,  retain  the  right  under  LICENSED  TECHNOLOGY,
LICENSED PATENTS and COLLABORATION  PROTEIN PATENTS to use a THERAPEUTIC PROTEIN
as to which SP  obtains  rights  under  Section 7 as a TARGET  and to  research,
develop,  make, have made, use,  import,  export,  offer to sell and sell a DRUG
PRODUCT or ANTIBODY PRODUCT.
         2.8 (a) During and after the INITIAL RESEARCH TERM, SP agrees to use SP
TECHNOLOGY and SP PATENTS only in the SP FIELD. After the INITIAL RESEARCH
                                       17
<PAGE>
TERM,  the use of SP  TECHNOLOGY to the extent  available to the general  public
through  publications  made by third  parties  independent  of SP shall not be a
breach of this paragraph 2.8.
                  (b) During and after the INITIAL  RESEARCH  TERM, SP agrees to
use LICENSED  TECHNOLOGY,  COLLABORATION  PATENTS and  LICENSED  PATENTS only as
licensed  and  permitted  hereunder.  After the INITIAL  RESEARCH  TERM,  (i) an
incidental  or  immaterial  use of  LICENSED  TECHNOLOGY  and/or (ii) the use of
LICENSED  TECHNOLOGY  to the extent  available to the general  public and to the
extent not covered by a granted LICENSED  PATENT,  shall not be a breach of this
paragraph 2.8.
         2.9 Except as permitted under Section 10, SP agrees not to grant to any
THIRD PARTY  (IES) any rights or  licenses  in or to an SP PRODUCT  until SP has
established PROOF OF EFFICACY for such SP PRODUCT.
         2.10 The  rights  and  licenses  granted to SP by HGS and SB under this
Agreement  and rights to SP  TECHNOLOGY  and SP PATENTS  are  licensable  and/or
transferable by SP to a THIRD PARTY only with respect to an SP PRODUCT, and only
pursuant to an  Agreement by which SP grants a license to a THIRD PARTY to an SP
PRODUCT as permitted  under Paragraph 2.9, or as permitted under Section 10, and
in which the THIRD PARTY (IES) agree(s) to covenants and obligations which limit
the use of SP PRODUCTS, LICENSED TECHNOLOGY, LICENSED PATENTS, SP TECHNOLOGY and
SP PATENTS which are  essentially  identical to the covenants and obligations of
SP to HGS and SB under this Agreement.
         2.11(a)  Subject  to the terms and  conditions  of this  Agreement,  SP
grants to HGS an  exclusive  worldwide  license  (with the right to  sublicense)
under SP PATENTS to make, have
                                       18
<PAGE>
made, use, export,  import,  offer to sell and sell  THERAPEUTIC  PROTEINS as to
which HGS or SB has obtained exclusive rights under Section 7.
                  (b)  Subject to the terms and  conditions  of this  Agreement,
including  the retained  right of SP under  Paragraph  2.13, SP grants to HGS an
exclusive  worldwide  license under SP PATENTS to make, have made, use,  export,
import,  offer to sell and sell THERAPEUTIC PROTEINS as to which a COLLABORATION
PARTNER has obtained  exclusive  rights under terms and  conditions  essentially
identical to Paragraph 7.1 for the sole purpose of granting a sublicense to such
COLLABORATION PARTNER. The license granted under this Paragraph 2.11(b) may only
be  sublicensed  to a  COLLABORATION  PARTNER who has entered  into an agreement
granting  essentially  identical rights to HGS and/or SB under all COLLABORATION
PROTEIN  PATENTS  owned  by the  COLLABORATION  PARTNER  and  which  rights  are
licensable  to SP for  THERAPEUTIC  PROTEINS  as to which SP  obtains  exclusive
rights under Section 7.
         2.12 Subject to the terms and conditions of this  Agreement,  SP grants
to HGS a  non-exclusive  worldwide,  royalty-free  license  (with  the  right to
sublicense) under SP PATENTS to make, have made, use, import,  offer to sell and
sell any and all products and processes in the HGS FIELD. The license granted in
this  paragraph  with respect to GENE THERAPY  shall be subject to the terms and
conditions of any agreement between HGS and SP with respect to GENE THERAPY.
         2.13 Notwithstanding any exclusive rights granted by SP with respect to
a  THERAPEUTIC  PROTEIN,  HGS and SB  acknowledge  and agree that SP retains the
right  under SP PATENTS and SP  TECHNOLOGY  to use a  THERAPEUTIC  PROTEIN as to
which
                                       19
<PAGE>
HGS, SB or a  COLLABORATION  PARTNER  obtains rights under Section 7 as a TARGET
and to research,  develop,  make, have made, use, import,  export, offer to sell
and sell a SP DRUG PRODUCT or SP ANTIBODY PRODUCT.
         2.14 Subject to the terms and conditions of this Agreement, SP grants a
non-exclusive,  royalty-free  license  to HGS and SB under (i) SP PATENTS to use
TARGETS which are PRODUCTS  developed by SP during the INITIAL  RESEARCH TERM or
EXTENDED TERM, and (ii) BLOCKING CLAIMS of SP PATENTS, in each case to research,
develop,  make,  have made,  use,  import,  export,  offer to sell and sell DRUG
PRODUCTS and ANTIBODY PRODUCTS other than SP PRODUCTS.  Such TARGETS need not be
disclosed  by SP to HGS or SB until such  TARGETS are  disclosed  to the public;
e.g.,  by  publication  of a patent  application.  HGS  shall  have the right to
sublicense  such rights to TARGETS which are PRODUCTS and BLOCKING  CLAIMS under
SP PATENTS to each COLLABORATION PARTNER and will grant such sublicenses only to
the extent that the COLLABORATION PARTNER(S) grants essentially identical rights
to HGS and/or SB under  COLLABORATION  PATENTS to TARGETS which are PRODUCTS and
BLOCKING CLAIMS which rights are or will be licensed to SP hereunder .
         2.15 HGS agrees not to grant any rights or licenses to any THIRD PARTY,
other than a COLLABORATION  PARTNER,  under HGS TECHNOLOGY and/or HGS PATENTS in
the SP FIELD with respect to (i) use of TARGETS which are PRODUCTS for screening
for DRUG  PRODUCTS  during the INITIAL  RESEARCH  TERM  and/or (ii)  THERAPEUTIC
PROTEINS  during  the  INITIAL  RESEARCH  TERM  other than those as to which HGS
obtains exclusive rights under Section 7, and/or (iii)  THERAPEUTIC  PROTEINS as
to which SP obtains and
                                       20
<PAGE>
"The  information  below marked [***] has been omitted pursuant to a request for
confidential treatment. The omitted portions have been separately filed with the
Commission."

maintains  exclusive  rights under Section 7 or as to which SP has exercised its
option under Section 9.

3.       PAYMENTS AND ROYALTIES
         ----------------------       
         3.1 (a) SP agrees to pay to HGS as an  upfront  fee an amount  equal to
[***]  which  shall be due and  payable  in five equal  payments  with the first
payment being due and payable ten (10) days after the EFFECTIVE DATE and each of
the second  through  fifth  payments  being due and payable on the first through
fourth  anniversaries  of the EFFECTIVE DATE,  respectively.  All payments to be
made hereunder  shall be by wire transfer of immediately  available  funds to an
account designated by HGS.
             (b) In the  event  that any  payment  due and  payable  under  this
Paragraph  3.1 is not paid when due and payable and remains  unpaid for a period
of thirty (30) days after  written  notice by HGS to SP of such  failure,  or if
this  Agreement is  terminated  by HGS  pursuant to Section 13 hereof,  then all
amounts  which are to be paid under  Paragraph  3.1(a)  which have not been paid
shall  become  immediately  due and  payable at the end of such  thirty (30) day
period.
         3.2  Subject to  Paragraphs  3.3,  3.5 and 3.6, SP shall pay to HGS the
following royalties on NET SALES of each SP PRODUCT sold by SP or its respective
licensees  ,  distributors  trading on SP's  account or joint  ventures or other
associated  companies,  which  royalty shall be calculated on a SP PRODUCT by SP
PRODUCT  basis,  with the  applicable  royalty  rate(s) for each SP PRODUCT in a
calendar  year  being  based on  worldwide  NET SALES for such SP PRODUCT in the
calendar  year  and  these  determined  royalty  rate(s)  being  applied  to all
worldwide NET SALES of such SP PRODUCT in such calendar year.
                                       21
<PAGE>
"The  information  below marked [***] has been omitted pursuant to a request for
confidential treatment. The omitted portions have been separately filed with the
Commission."

                              SP PROTEIN PRODUCT
         Net Sales              OR SP ANTIBODY
(U.S. Dollars in Millions)          PRODUCT           SP DRUG PRODUCT

         [***]                      [***]                   [***]
         [***]                      [***]                   [***]   
         [***]                      [***]                   [***]
         [***]                      [***]                   [***]        




         By way of example and for avoidance of doubt,  if an SP PROTEIN PRODUCT
or an SP  ANTIBODY  PRODUCT  shall  have  applicable  worldwide  NET  SALES in a
calendar year of [***], then the royalty rates and royalties owed shall be [***]
on all sales of such SP PROTEIN PRODUCT or SP ANTIBODY PRODUCT.
         3.3 (a) With  respect to any SP PRODUCT in any country in any  calendar
year,  in the event  that SP also owes  royalties  to a THIRD  PARTY for such SP
PRODUCT in such country for such calendar  year and the royalties  actually owed
to such THIRD PARTY when  aggregated  with the royalties owed to HGS for such SP
PRODUCT in such country in such  calendar  year  (hereafter  for the purposes of
this Paragraph 3.3 shall be "Aggregated  Royalties")  causes the royalty rate on
NET SALES for such SP PRODUCT in such  country in such  calendar  year to exceed
[***] , then  one-half of the  royalties  which are to be actually  paid to such
THIRD PARTY may be credited against the royalties due to HGS for such SP PRODUCT
in such country in such  calendar  year,  but in no event shall the royalty rate
payable to HGS be reduced to less than [***], nor shall the Aggregated Royalties
for such SP PRODUCT be reduced to less than [***].
                                       22
<PAGE>
"The  information  below marked [***] has been omitted pursuant to a request for
confidential treatment. The omitted portions have been separately filed with the
Commission."

                  (b) With  respect  to an SP  PROTEIN  PRODUCT  as to which the
making, having made, using, selling,  importing,  exporting or offering for sale
is not covered by a granted claim of a LICENSED  PATENT and as to which at least
[***]and  less than [***] of the full length cDNA  coding  sequence  for, or the
cDNA  corresponding  to the amino acid  sequence  of the final form of,  such SP
PROTEIN  PRODUCT  is  independently  identified  by SP without  use of  LICENSED
TECHNOLOGY or SP TECHNOLOGY, the royalties due for such SP PROTEIN PRODUCT under
Paragraph 3.2 shall be reduced by [***].
         3.4 SP shall make the following  milestone  payments to HGS for each SP
PRODUCT,  which  milestone  payment shall be due and payable  within thirty (30)
days after the  milestone  event is achieved by or on behalf of SP or a licensee
of  SP.  All  payments  to be  made  hereunder  shall  be by  wire  transfer  of
immediately available funds to an account designated by HGS.

                           (i) [***] upon  successful  completion of Phase I for
an SP PRODUCT,  except that for an SP PROTEIN  PRODUCT this  milestone  shall be
split with [***] upon  successful  completion  of Phase I and another [***] upon
successful completion of Phase II(a);      
                           (ii) [***] upon first  submission  of an  application
for regulatory approval of an SP PRODUCT in a MAJOR MARKET;
                           (iii) [***] upon the first  approval of an SP PRODUCT
for commercial sale in a MAJOR MARKET (provided,  however,  that any pricing and
third  party  reimbursement   approvals  (including   governmental  pricing  and
reimbursement  approvals  as  necessary  for  sale of the SP  PRODUCT  are  also
received).

                                      23
<PAGE>
         The milestone  payments  provided in this paragraph  shall only be made
once for each SP PRODUCT  and shall not be made in the case of  improvements  or
modifications  such  as but  not  limited  to  changed  forms,  formats,  salts,
formulations, indications, processes or protocols of an SP PRODUCT for which the
payments were previously made.
         3.5 Royalty obligations under this Agreement and any agreements that SP
shall enter into with a licensee, with respect to SP PRODUCT, shall terminate on
a country-by-country and  product-by-product  basis on the later of (i) ten (10)
years after first  country-wide  launch of each  product in each country or (ii)
expiration of the last to expire SP PATENT or LICENSED  PATENT or  COLLABORATION
PATENT licensed to SP under this Agreement which covers the making, having made,
importing,  exporting,  offering to sell or using or selling of each  product in
each country.
         3.6 SP shall not be obligated to pay royalties  under  Paragraph 3.2 or
milestones under Paragraph 3.4 with respect to any of the following:
                  (a) SP PROTEIN  PRODUCT as to which the making,  having  made,
using,  importing,  exporting,  offering to sell and selling is not covered by a
granted claim of a LICENSED PATENT or COLLABORATION  PATENT licensed to SP under
this Agreement and of which at least 95% of the full length cDNA coding sequence
for, or the cDNA  corresponding to the amino acid sequence of the final form of,
such SP  PROTEIN  PRODUCT  is  independently  identified  by SP  without  use of
LICENSED TECHNOLOGY or SP TECHNOLOGY.
                  (b)  SP  DRUG  PRODUCT  or  SP  ANTIBODY   PRODUCT   which  is
encompassed by a DRUG RESEARCH PLAN or ANTIBODY RESEARCH PLAN submitted
                                       24
<PAGE>
by SP in  accordance  with this  Agreement  which SP DRUG PRODUCT or SP ANTIBODY
PRODUCT is not covered by a claim of a granted  LICENSED PATENT or COLLABORATION
PATENT licensed to SP under this Agreement and in the case of SP DRUG PRODUCT is
DISCOVERED  after  the  later of (i) four  years  after  the end of the  INITIAL
RESEARCH  TERM or (ii) four years after the end of the EXTENDED  TERM and in the
case of SP ANTIBODY  PRODUCT is DISCOVERED after four years after the end of the
INITIAL RESEARCH TERM;
                  (c) SP PRODUCT which is DISCOVERED  after the INITIAL RESEARCH
TERM,  or in the  case of a SP DRUG  PRODUCT  after  the  later  of the  INITIAL
RESEARCH TERM or the EXTENDED TERM, and which SP PRODUCT is not encompassed by a
RESEARCH PLAN submitted by SP under this Agreement, and the only reason why such
SP PRODUCT is SP PRODUCT is because of use of one or more of the following:  (i)
use of unpatented  LICENSED TECHNOLOGY after the later of the end of the INITIAL
RESEARCH TERM or EXTENDED TERM which LICENSED TECHNOLOGY at the time of such use
is generally available to the public, and/or (ii) use of SP TECHNOLOGY developed
after the later of the end of the INITIAL  RESEARCH  TERM or EXTENDED TERM which
is SP  TECHNOLOGY  only as the result of use of unpatented  LICENSED  TECHNOLOGY
which is generally available to the public at the time of such use, and/or (iii)
use of  SOFTWARE  after the  later of the end of the  INITIAL  RESEARCH  TERM or
EXTENDED TERM.
                  (d) SP  PRODUCT  which is  DISCOVERED  after the later of four
years after the end of the INITIAL  RESEARCH  TERM or  EXTENDED  TERM,  which SP
PRODUCT is not encompassed by a RESEARCH PLAN submitted by SP in accordance with
this Agreement
                                       25
<PAGE>
"The  information  below marked [***] has been omitted pursuant to a request for
confidential treatment. The omitted portions have been separately filed with the
Commission."

and which SP PRODUCT is an SP PRODUCT  only  because  the SP PRODUCT is based on
the use of or derived by the use of SP TECHNOLOGY.
                  (e) SP  PRODUCT  for which SB is granted  co-promotion  rights
under the SP/SB AGREEMENT.
                  (f) SP DRUG PRODUCT or SP ANTIBODY PRODUCT which is DISCOVERED
by or on  behalf  of SP  which  is a SP DRUG  PRODUCT  or SP  ANTIBODY  PRODUCT,
respectively,  only as a result  of the use of a TARGET as to which at least 95%
of the full length cDNA coding  sequence for, or the cDNA  corresponding  to the
amino  acid  sequence  of the  final  form  of,  such  TARGET  is  independently
identified by SP without use of LICENSED TECHNOLOGY or SP TECHNOLOGY,  and where
neither the SP DRUG PRODUCT nor SP ANTIBODY PRODUCT nor the TARGET is covered by
a granted claim of a LICENSED PATENT or COLLABORATION PATENT.
         3.7 [***] of all payments to be made by SP pursuant to Sections 3.1 and
3.4 shall be paid by [***] and [***] shall be paid by [***].  All payments to be
made by SP  pursuant  to  Section  3.2  shall be  apportioned  between  Schering
Corporation  and  Schering-Plough  Ltd.  according to the  provisions of Section
12.5. The foregoing  notwithstanding,  Schering  Corporation and Schering-Plough
Ltd.  are jointly  and  severally  liable for any and all  payments by SP to HGS
pursuant to this Section 3, provided that payments made by Schering-Plough  Ltd.
does not cause HGS to be subject to additional  taxes and/or a  withholding  tax
solely as a result of such payments  being made by Schering-  Plough Ltd. In the
event that (i) payments made by Schering-Plough, Ltd. cause HGS to be subject to
additional taxes and/or withholding tax, and (ii) such additional taxes and/or
                                       26
<PAGE>
withholding  tax are due  solely  as a result  of such  payments  being  made by
Schering-Plough, Ltd., then SP and HGS shall agree upon an alternative manner of
payment.
         3.8 The manner in which  statements and remittances of royalty payments
are handled are as set forth in Section 12 hereof.

4.       RESEARCH TERM AND RESEARCH PLANS
         --------------------------------

         4.1      The INITIAL RESEARCH TERM shall terminate five years after the
EFFECTIVE DATE.
         4.2 The INITIAL RESEARCH TERM may be extended for up to five additional
years by written notice  provided to HGS by SP at least sixty (60) days prior to
the end of the  INITIAL  RESEARCH  TERM or at least sixty (60) days prior to the
end of any one year extension  thereof.  A payment of [xxx] for each  additional
year shall be due within ten (10) days of the end of the INITIAL  RESEARCH  TERM
or the end of any one year extension thereof, as the case may be.
         4.3 A DRUG  RESEARCH  PLAN and/or a  PRELIMINARY  DRUG PLAN may only be
submitted  to HGS by SP during the INITIAL  RESEARCH  TERM  and/or the  EXTENDED
TERM. An ANTIBODY  RESEARCH PLAN and/or a PRELIMINARY  ANTIBODY PLAN may only be
submitted by SP to HGS during the INITIAL RESEARCH TERM.
          4.4 A PROTEIN  RESEARCH PLAN may only be submitted by SP to HGS during
the INITIAL  RESEARCH TERM and only in accordance with Section 7. Such a PROTEIN
RESEARCH  PLAN  shall be deemed  to also be an  ANTIBODY  RESEARCH  PLAN for all
antibodies against the THERAPEUTIC PROTEIN.
                                       27
<PAGE>
          4.5 (a) SP agrees  that SP will not  initiate  screening  to  evaluate
multiple  chemical  entities for activity or a formal  program of rational  drug
design (i) with respect to a TARGET which is a PRODUCT,  or with respect to a SP
DRUG  PRODUCT,  during the INITIAL  RESEARCH TERM or EXTENDED TERM without first
submitting  a  PRELIMINARY  DRUG PLAN,  or (ii) with  respect to an SP  ANTIBODY
PRODUCT without first  submitting to HGS a PRELIMINARY  ANTIBODY PLAN during the
INITIAL RESEARCH TERM.
             (b) In the event that a DRUG RESEARCH  PLAN  submitted by SP to HGS
is directed to the use of a TARGET  which was  DISCOVERED  by or on behalf of SP
without the  assistance  of HGS and/or SB and/or a  COLLABORATION  PARTNER,  HGS
agrees not to use such TARGET and/or any biological  information with respect to
such TARGET  contained in the DRUG  RESEARCH PLAN until such TARGET is generally
identified  to the  public,  unless  HGS has  initiated  use  thereof  prior  to
submission of such DRUG  RESEARCH  PLAN or HGS and/or SB and/or a  COLLABORATION
PARTNER  DISCOVERS  such TARGET prior to receipt of the DRUG  RESEARCH PLAN from
SP.
             (c) HGS  agrees  not to  disclose  to SB  and/or a THIRD  PARTY any
RESEARCH PLANS  submitted by SP, or TARGETS  encompassed by such RESEARCH PLANS,
provided,  however, that HGS may disclose TARGETS to the extent disclosed to the
public.
         4.6 With  respect to each TARGET  encompassed  by an ANTIBODY  RESEARCH
PLAN,  SP shall  identify to HGS in writing the full length DNA coding  sequence
therefor promptly after such DNA coding sequence is available to the public.
                                       28
<PAGE>
"The  information  below marked [***] has been omitted pursuant to a request for
confidential treatment. The omitted portions have been separately filed with the
Commission."

         4.7 With respect to each TARGET encompassed by a DRUG RESEARCH PLAN, SP
shall  identify to HGS in writing the full length DNA coding  sequence  therefor
promptly after such DNA coding sequence is available to the public.

5.       ADDITIONAL PAYMENTS
         -------------------

         5.1 (a) In  support  of HGS'  research,  SP shall pay to HGS a total of
[***] which shall be due and payable as follows:
                           (i) [***]  within ten (10) days  after the  EFFECTIVE
DATE:
                           (ii)  [***]  on  each  of the  first  through  fourth
anniversaries of the EFFECTIVE DATE.
             (b) In the event that any payment due and payable  under  Paragraph
5.1(a) is not paid  when due and  payable  and  remains  unpaid  for a period of
thirty (30) days after written  notice by HGS to SP of such failure,  or if this
Agreement is  terminated  by HGS under Section 13, then all amounts which are to
be paid under Paragraph 5.1(a) which have not been paid shall become immediately
due and payable at the end of such thirty (30) day period.

6.       TECHNOLOGY TRANSFER AND ADDITIONAL LICENSED TECHNOLOGY
         ------------------------------------------------------

         6.1 (a) Promptly after the EFFECTIVE DATE, HGS shall disclose to SP all
information which is HGS TECHNOLOGY.
                  (b) Throughout the INITIAL  RESEARCH TERM,  except as provided
in Paragraph 6.2, HGS shall promptly provide to SP all information  which is HGS
TECHNOLOGY and materials (as available to HGS and as reasonably requested by SP)
which  are  HGS  TECHNOLOGY  including,   without  limitation,  (i)  preliminary
annotation data of DNA
                                       29
<PAGE>
sequences which are HGS TECHNOLOGY such as tissue source; library specifications
for libraries  from which DNA sequences  which are HGS  TECHNOLOGY are obtained;
(ii) sequence  homologies  and motif searches with respect to DNA sequences (and
encoded  polypeptides)  which are HGS TECHNOLOGY;  (iii) biological  information
obtained by HGS with respect to DNA sequences and encoded polypeptides which are
HGS TECHNOLOGY; and (iv) clones containing sequences which are HGS TECHNOLOGY as
available  to HGS and as  reasonably  requested by SP; and (v)  expression  cell
lines and vectors, as reasonably  requested by SP and as available to HGS and to
the extent that HGS is not  contractually  precluded from providing them, is for
the sole purpose of research and development in the SP FIELD. SP understands and
agrees that  experimental data relating to  characterization  of DNA and encoded
polypeptides are not included in this Paragraph 6.1(b).
                  (c) Except as otherwise set forth herein, HGS TECHNOLOGY to be
provided to SP pursuant to Paragraphs 6.1(a) and 6.1(b)(i), (ii) and (iii) shall
be in the form of  electronic  transfers  of the HGS  TECHNOLOGY  and HGS  shall
deliver the HGS  TECHNOLOGY to SP in a manner and format which is compatible for
use with the SOFTWARE.
                  (d) Promptly  after the  EFFECTIVE  DATE,  HGS will provide SP
with printouts of HGS full length gene reports which are HGS  TECHNOLOGY  and/or
SPECIAL SB TECHNOLOGY, which reports shall be sorted by THERAPEUTIC PROTEINS and
TARGETS.
                  (e) SB shall promptly  disclose to SP all information which is
SPECIAL SB  TECHNOLOGY,  which  shall be  disclosed  to SP directly by SB and/or
through HGS. SB agrees that it will provide SP promptly after the EFFECTIVE DATE
with an inventory (including
                                       30
<PAGE>
TARGET  descriptions and code numbers) of all SPECIAL SB TECHNOLOGY.  A template
of the form in which  the  SPECIAL  SB  TECHNOLOGY  is  generally  available  is
attached as Appendix H of this Agreement.  SB further agrees that promptly after
the EFFECTIVE DATE it shall make reasonably available to SP, as mutually agreed,
the  appropriate SB personnel  necessary to meet with  representatives  of SP to
provide  details of  biological  information  which is SPECIAL SB  TECHNOLOGY to
enable  such  representatives  of SP to  prioritize  the  delivery of SPECIAL SB
TECHNOLOGY  from SB and/or HGS to SP.  Both SB and SP agree to act in good faith
to effect the prompt and orderly  delivery of all SPECIAL SB TECHNOLOGY to SP in
accordance  with SP priorities.  SB agrees that such delivery shall be completed
no later than ninety (90) days after the EFFECTIVE DATE.
         6.2  HGS  shall  not  be  required  to  transfer  to SP  sequence  data
consisting of second walks and full length  sequences or biological  information
or  clones,  in each case which are HGS  TECHNOLOGY  with  respect to  potential
THERAPEUTIC  PROTEINS,  until HGS,  SP, SB or a  COLLABORATION  PARTNER  obtains
exclusive rights thereto pursuant to Section 7. The preceding sentence shall not
apply to second walks performed by HGS at the specific request of SP.
         6.3 The transfer of LICENSED  TECHNOLOGY  to SP shall be  documented by
HGS and SB, as the case may be. Such  documentation  shall  include,  but not be
limited to,  transfer  of LICENSED  TECHNOLOGY  to SP  electronically  and/or in
writing  and/or,  in the case of oral  transfer,  by written notice to SP of the
substance of such oral transfer.
         6.4 At the  later  of the  end of  the  INITIAL  RESEARCH  TERM  or the
EXTENDED  TERM, as the case may be, SP shall  promptly  return to HGS and SB, as
the case may be, any
                                       31
<PAGE>
and all  LICENSED  TECHNOLOGY  other  than  LICENSED  TECHNOLOGY  as to which SP
retains a license hereunder,  including, without limitation, LICENSED TECHNOLOGY
which is not deemed confidential in accordance with Paragraph 10.2.
         6.5 SP agrees to maintain security measures  (including but not limited
to computer and computer  network  security  measures)  for LICENSED  TECHNOLOGY
which are similar to the measures  currently employed by SP to safeguard its own
confidential  information.  These security measures have been discussed with HGS
and SB which both agree that such security measures are acceptable to HGS and SB
respectively.
          6.6 (a) To the  extent it has not  already  been  provided  to SP, HGS
shall provide to SP, promptly  following the EFFECTIVE DATE,  without additional
charge,  initial  copies of the  SOFTWARE  and  thereafter,  during the  INITIAL
RESEARCH  TERM,  as they become  available,  copies of any  enhancements  to the
SOFTWARE  made  by  HGS  during  the  INITIAL   RESEARCH  TERM,   including  all
modifications  to the SOFTWARE which  increase the speed,  efficiency or ease of
operation  of the  SOFTWARE,  or add  additional  capabilities  to or  otherwise
improve the functions of the SOFTWARE.
             (b) For a period of two years after the EFFECTIVE  DATE,  HGS shall
provide to SP, without  additional  charge,  all necessary  telephone or on-site
consultation  requested by SP in  connection  with its use and  operation of the
SOFTWARE or any problems therewith.  Telephone consultation shall be provided by
HGS during normal business hours.
             (c)  SP  shall  have  the  right,   in  its  own   discretion,   to
independently modify the SOFTWARE for its own purposes and use SOFTWARE, through
the services of its own employees or of independent  contractors,  provided that
same agree not to disclose or distribute

                                       32
<PAGE>
"The  information  below marked [***] has been omitted pursuant to a request for
confidential treatment. The omitted portions have been separately filed with the
Commission."

any part of the  SOFTWARE  to any other  person or entity or  otherwise  violate
HGS's  proprietary   rights  therein.   SP  shall  be  the  owner  of  any  such
modification.   SP  may,  at  its  sole   discretion,   provide  such   SOFTWARE
modifications  to HGS,  which will be retained by HGS in confidence and will not
be disclosed to SB, a COLLABORATION PARTNER or any THIRD PARTY without the prior
written consent of SP. HGS shall not incorporate any such  modification into its
software for  distribution  to SB,  COLLABORATION  PARTNERS or THIRD  PARTY(IES)
unless SP (in its sole  discretion)  first  consents  in  writing  and HGS first
agrees to pay SP a reasonable  royalty,  pursuant to mutually agreed upon terms.
SP acknowledges and agrees that SOFTWARE and any modified SOFTWARE  developed by
or on behalf of SP may only be used by or for SP and may not be  transferred  to
SB or a THIRD PARTY.
         6.7  During  the  INITIAL  RESEARCH  TERM SP shall  have  the  right to
prioritize the sequencing by HGS of [***]  expressed sequence tags per year. HGS
shall use diligent  efforts to complete such prioritized  sequencing  (including
sequencing from cDNA libraries supplied by SP) as mutually agreed by HGS and SP,
subject to timely receipt by HGS of directions regarding  prioritization  and/or
cDNA libraries suitable for such sequencing from SP. All such expressed sequence
tags and the clones  containing  such expressed  sequence tags shall be owned by
HGS and shall be HGS TECHNOLOGY under this Agreement.
         6.8 During the INITIAL  RESEARCH  TERM,  HGS shall  maintain its annual
human cDNA sequencing activities at a level at least commensurate with the level
of human cDNA  sequencing  during the one year period  immediately  prior to the
EFFECTIVE DATE.
                                       33
<PAGE>
         6.9 SP may request additional research services from HGS at HGS's fully
allocated  cost where HGS and SP mutually  agree  thereto.  For sequencing of SP
libraries under this Paragraph, HGS will not use or disclose sequences sequenced
from such  libraries  to  COLLABORATION  PARTNERS or SB until twelve (12) months
after delivery of such sequences to SP.
         6.10 HGS shall  have the  right to delay  for a period  of (12)  months
disclosure to SP of such HGS TECHNOLOGY resulting from work performed by HGS for
a  COLLABORATION  PARTNER or SB pursuant to a provision of an  agreement  with a
COLLABORATION PARTNER or the COLLABORATION AGREEMENT similar to Paragraph 6.9 of
this Agreement.
         6.11 Any sequences and clones  containing such sequences  arising under
Pargraph 6.9 shall be owned by HGS and are HGS TECHNOLOGY.

7.       THERAPEUTIC PROTEINS
         --------------------

         7.1 SP,  a  COLLABORATION  PARTNER,  HGS or SB shall  obtain  exclusive
rights to any specific  THERAPEUTIC  PROTEIN  which is a PRODUCT in the SP FIELD
provided:
                  (a) as among SP, HGS, SB and such COLLABORATION  PARTNER, such
entity is the first to submit to HGS,  or in the case of HGS to submit to SB, an
information  package as permitted under this Agreement (or an agreement  between
SB and/or HGS and each of the  COLLABORATION  PARTNERS)  prior to the end of the
INITIAL RESEARCH TERM which:
                  (i) demonstrates  evidence of in vivo biological  activity for
any such THERAPEUTIC PROTEIN.  Such evidence of in vivo biological activity must
be statistically
                                       34
<PAGE>
different (p less than 0.05) from control for at least one data point,  and must
be  demonstrated  in an experiment  using at least three (3) dosages of the test
substance in which at least a trend of dose related activity is demonstrated,
                             OR
                   (ii) in the case of a  THERAPEUTIC  PROTEIN  (a) for which in
vivo  activity  cannot be  demonstrated  after bone fide attempts to do so in at
least two (2)  sub-primate  species,  or (b) it is  demonstrated  by  documented
evidence  (from  scientific  literature  or in-house  studies) that the relevant
effector  system does not exist in  sub-primates,  or (c) it is  demonstrated by
documented evidence (from scientific  literature or in-house studies) that there
is an absence of reactivity with relevant targets in sub-primates,  demonstrates
evidence of in vitro biological  activity in at least one (1) relevant  cellular
based  assay  for any  such  THERAPEUTIC  PROTEIN.  Such  evidence  of in  vitro
biological  activity  must be  statistically  different  (p less than 0.05) from
control for at least one data point,  and must be  demonstrated in an experiment
using at least three (3)  concentrations of the test substance in which at least
a trend of dose related activity is demonstrated.
              The preparation used to demonstrate biological activity shall be:
                  (i) a purified  preparation in which at least 75% (w/w) of the
                  protein  component  of  the  preparation  is  the  THERAPEUTIC
                  PROTEIN; or
                  (ii)  a   purified   preparation   in   which   the   relative
                  concentration  and/or  specific  activity  of the  THERAPEUTIC
                  PROTEIN has been  increased  at least 1000 fold as compared to
                  an unpurified preparation.
                                       35
<PAGE>
"The  information  below marked [***] has been omitted pursuant to a request for
confidential treatment. The omitted portions have been separately filed with the
Commission."

         In no case shall the  concentration of the THERAPEUTIC  PROTEIN be less
than 1 microgram/ml.  in the purified  preparation of (i) or (ii). Such purified
preparation  shall  be  shown  to  have  a  biological  activity  which  is  not
attributable to endotoxin contamination; and
                  (b) exclusive rights to such THERAPEUTIC PROTEIN have not been
previously  given to SB or HGS or SP or a COLLABORATION  PARTNER as the case may
be in accordance with the  requirements of this Paragraph 7.1 or under Paragraph
7.2; and
                  (c) SP, HGS, the COLLABORATION  PARTNERS or SB as the case may
be, submits with the information package a PROTEIN RESEARCH PLAN therefor.
         7.2 SP  acknowledges  and agrees  that rights are not  available  to SP
under this Section with respect to the following THERAPEUTIC PROTEINS:

                  Therapeutic Protein                HGS Sequence ID
                                                     ---------------

                          [***]                        [***]
                          [***]                        [***]
                          [***]                        [***]
                          [***]                        [***]
                          [***]                        [***]
                          [***]                        [***]
                          [***]                        [***]
                          [***]                        [***]
                          [***]                        [***]
                          [***]                        [***]
                          [***]                        [***]
                          [***]                        [***]


         It is  understood  that  the  HGS  Sequence  ID is  for  identification
purposes only and that,  for purposes of paragraph 7.1 and this  paragraph  7.2,
all  clones and  sequences  and  polypeptides  associated  with the  THERAPEUTIC
PROTEIN as well as muteins  and  fragments  thereof  are  included in the rights
granted herein.
                                       36
<PAGE>
         7.3  (a)  Within  ninety  (90)  days  from  the  receipt  by SP of  HGS
TECHNOLOGY in existence as of the EFFECTIVE DATE in the form of full length gene
reports,  relevant to THERAPEUTIC PROTEINS which are PRODUCTS, SP shall have the
right to obtain exclusive rights to two (2) THERAPEUTIC PROTEINS under Paragraph
7.1 without meeting the evidence requirements of Paragraph 7.1 (a).
                  (b) To the extent  available to HGS as of the EFFECTIVE  DATE,
HGS shall provide SP with  reasonable  quantities of THERAPEUTIC  PROTEINS which
are HGS TECHNOLOGY.
                  (c)  HGS  will  also  promptly  provide  to  SP  all  material
information  relating to the granted patents and pending patent  applications in
existence as of the EFFECTIVE DATE for each THERAPEUTIC PROTEIN.
         7.4 The rights  granted to a  THERAPEUTIC  PROTEIN under this Section 7
and Paragraph 2.4 includes muteins and fragments thereof.
         7.5 HGS shall notify SP in writing as to whether or not SP has obtained
exclusive  rights to a THERAPEUTIC  PROTEIN under this Section 7 within ten (10)
business  days  after  submission  of an  information  package to HGS by SP. The
failure of HGS to respond within such period shall be deemed to be  notification
that the information package meets the requirements of this Section 7.
         7.6 In the  event  that  SP is  notified  that an  information  package
submitted  by  SP  does  not  meet  the  requirements  of  Paragraph  7.1,  such
notification  shall include the reasons as to why such information  package does
not meet such  requirements.  If the  reason for such  notification  is that the
information package did not include the data and/or RESEARCH PLAN required
                                       37
<PAGE>
by Paragraph 7.1 and SP disagrees with such notification,  then HGS and SP shall
attempt to resolve such  differences  including by  discussions  between  senior
management of HGS and SP, if necessary.  If such dispute is not resolved  within
twenty (20) days, then SP shall have the right to submit such dispute to binding
arbitration  under  Section 29 and if SP fails to do so, then the decision  that
such information  package did not meet such requirements shall be binding on SP.
If there is a dispute under this Agreement  and/or the  COLLABORATION  AGREEMENT
and/or an agreement with a  COLLABORATION  PARTNER with respect to a THERAPEUTIC
PROTEIN  as to  whether  or not a party  thereto  was the  first  to  submit  an
information  package meeting the  requirements of paragraph 7.1 (or requirements
essentially  identical thereto),  then no rights will be granted with respect to
such THERAPEUTIC PROTEIN until such dispute is resolved. In the event that SP is
notified that HGS, SB or a COLLABORATION  PARTNER has, prior to SP, submitted an
information  package and PROTEIN RESEARCH PLAN for the same THERAPEUTIC  PROTEIN
for which SP has also filed an  information  package and PROTEIN  RESEARCH PLAN,
such notification shall also include:
                  (i) the date on  which  the  non-SP  information  package  and
                  PROTEIN   RESEARCH   PLAN  was  received  by  HGS  or  SB,  as
                  appropriate; and
                  (ii) a  certification  on  behalf  of HGS,  signed by a senior
                  officer of HGS, that such non-SP information package (i.e., by
                  HGS and/or SB and/or a  COLLABORATION  PARTNER) met all of the
                  requirements  of Paragraph  7.1 prior to HGS's receipt of SP's
                  information  package  and PROTEIN  RESEARCH  PLAN for the same
                  THERAPEUTIC PROTEIN.
                                       38
<PAGE>
         7.7 (a) Subject to the  dispute  requirements  of  Paragraph  7.6,  the
parties  acknowledge  and  agree  that a  decision  by HGS (or in the  case of a
submission  by HGS a  decision  by SB) that a party  hereto  or a  COLLABORATION
PARTNER has submitted an  information  package which meets the  requirements  of
this Section 7 and as a result has  exclusive  rights to a  THERAPEUTIC  PROTEIN
shall be final and binding  between  the parties  hereto and shall also be final
and  binding  between  SP  and  a  COLLABORATION   PARTNER  provided  that  such
COLLABORATION  PARTNER  also  agrees  that the  rights  granted to SP under this
Section 7 are final and binding as to such COLLABORATION PARTNER. (b) Neither SB
nor HGS  shall  have  any  liability  to SP with  respect  to  their  respective
decisions  that SB, HGS or a  COLLABORATION  PARTNER has  exclusive  rights to a
THERAPEUTIC  PROTEIN under this  Agreement,  the  COLLABORATION  AGREEMENT or an
agreement with a  COLLABORATION  PARTNER or that SP does or does not have rights
to a THERAPEUTIC  PROTEIN unless there has been willful misconduct by HGS and/or
SB.
         7.8 HGS shall  identify to SP, by HGS  sequence  ID,  each  THERAPEUTIC
PROTEIN which is a PRODUCT as to which exclusive rights have been granted to HGS
and/or SB and/or a COLLABORATION PARTNER within ten (10) business days after the
granting of such rights.
         7.9 HGS agrees that  information  packages and PROTEIN  RESEARCH  PLANS
submitted  by  SP  with  respect  to  THERAPEUTIC  PROTEINS  shall  be  strictly
confidential  and shall be  provided to only those  employees  at HGS who are to
decide  whether  or not  the  information  package  meets  the  requirements  of
Paragraph 7.1, not to exceed five (5) employees.
                                       39
<PAGE>
HGS further agrees that all such information packages and PROTEIN RESEARCH PLANS
will not be utilized by or on behalf of HGS for any purpose.
         7.10 HGS agrees that it will promptly inform SB and each  COLLABORATION
PARTNER  of each  THERAPEUTIC  PROTEIN  by HGS  Sequence  ID  number  for  which
exclusive  rights have been granted to SP under this Agreement,  but in doing so
will not  identify  SP as the  party to whom  such  exclusive  rights  have been
granted.
         7.11 HGS  agrees  that for each  THERAPEUTIC  PROTEIN  for  which it is
seeking exclusive rights (other than those specified in Paragraph 7.2), HGS will
submit to SB an  information  package and a PROTEIN  RESEARCH  PLAN  therefor in
conformity  with the terms and  conditions of Paragraph 7.1 for  evaluation.  SB
will,  in good  faith,  determine  whether or not such  information  package and
PROTEIN  RESEARCH  PLAN meet the  criteria  set forth in  Paragraph  7.1 of this
Agreement.
         Subject to the  dispute  requirements  of  Paragraph  7.6,  the parties
acknowledge  and  agree  that  a  decision  by SB  that  HGS  has  submitted  an
information  package and PROTEIN  RESEARCH PLAN which meets the  requirements of
this Section 7 and as a result that HGS has  exclusive  rights to a  THERAPEUTIC
PROTEIN shall be final and binding as among the parties hereto.
         7.12 For purposes of this Section 7, an  information  package  and/or a
PROTEIN RESEARCH PLAN shall be deemed submitted when it is actually  received by
HGS or SB, as the case may be.
                                       40
<PAGE>
"The  information  below marked [***] has been omitted pursuant to a request for
confidential treatment. The omitted portions have been separately filed with the
Commission."

         7.13 For purposes of this Section 7, the term "business day" shall mean
each weekday which is not a legal holiday in the City of New York and which is a
day on which each of the parties would normally conduct business operations.

8.       PRODUCT DEVELOPMENT
         -------------------

         8.1 SP shall use diligent efforts to develop,  market, promote and sell
royalty  bearing SP PROTEIN  PRODUCT  equivalent  to those  efforts it uses with
respect to the  proteins of similar  value and status,  subject to SP's right to
terminate  such  efforts  and  surrender  all rights in and to such  THERAPEUTIC
PROTEIN.
         8.2 After the INITIAL  RESEARCH TERM, SP shall use diligent  efforts to
develop  screens and to screen for SP DRUG  PRODUCTS  which are the subject of a
DRUG  RESEARCH  PLAN  submitted  by SP  equivalent  to those  efforts it uses to
develop  and screen for drug  products  using its other  proprietary  targets of
similar value and status.
         8.3  Within  sixty (60) days after the end of each  calendar  year,  SP
shall provide to HGS in writing annual reports with respect to work performed by
or for SP under RESEARCH PLANS.

9.       SP CO-RIGHTS
         ------------

         9.1  In  addition  to  the  rights  obtained  by  SP  with  respect  to
THERAPEUTIC  PROTEINS under Section 7, HGS acknowledges and agrees that SP shall
have the  right  and  option  to  obtain   rights  in  and to [***]  THERAPEUTIC
PROTEINS as to which HGS has obtained  exclusive  rights  under  Section 7 which
have not been  licensed  to  another  entity  prior to  initiating  Phase  II(a)
Clinical  Studies  and as to  which  Phase  II(a)  Clinical  Studies  have  been
completed by or on behalf of HGS. The option shall be exercised by SP in writing
within sixty
                                       41
<PAGE>
"The  information  below marked [***] has been omitted pursuant to a request for
confidential treatment. The omitted portions have been separately filed with the
Commission."


(60)  days  after  HGS  notifies  SP in  writing  that  such  studies  have been
completed. HGS and SP may mutually agree that such rights may be exercised at an
earlier time. Upon exercise of the option, HGS and SP shall negotiate a separate
agreement which shall embody the following principles:
         (a) HGS and SP shall equally share all prospective costs,  expenses and
profits incurred with respect to such two products after completion of Phase IIa
clinical  studies,  provided,  however,  that such costs and expenses  shall not
include  the  cost of  capital  expenditures,  except  to the  extent  that  the
depreciation of capital expenditures is included in costs and expenses.
         (b)      SP's rights will be  determined  by mutual  agreement  and may
                  include (i) copromotion and/or (ii) co-marketing  and/or (iii)
                  exclusive rights in agreed-to territories.
         (c)      Neither  HGS nor SP  shall  have a  right  to  sublicense  its
                  co-promotion or co- marketing rights.
         (d)      A Japanese  company may have certain rights to the products in
                  Japan and to the extent  that such  rights  exist,  SP and HGS
                  shall  adjust  the  rights  in the  remainder  of the world to
                  compensate SP for loss of rights in Japan.
         9.2 [***]
         9.3(a) In the event that,  prior to  initiating  Phase  II(a)  Clinical
Studies,  HGS  decides  to  license a  THERAPEUTIC  PROTEIN  as to which HGS has
obtained exclusive rights under
                                       42
<PAGE>
Section 7, then HGS shall offer such THERAPEUTIC PROTEIN to SP in writing, along
with the PROTEIN RESEARCH PLAN submitted by HGS with respect thereto, and within
ninety (90) days thereafter SP shall have the right, in its sole discretion,  to
designate such THERAPEUTIC PROTEIN as an SP PROTEIN PRODUCT subject to the terms
and conditions of this Agreement.  With such written notice by SP, SP shall also
submit a PROTEIN RESEARCH PLAN.
         (b) The option granted to SP under  paragraphs 9.1 and 9.3(a) shall not
be applicable to any THERAPEUTIC PROTEIN after SP has exercised its option under
Paragraph  9.1 and under  Paragraph  9.3(a)  such that in the  aggregate  SP has
obtained rights under Paragraphs 9.1 and 9.3(a) to two (2) THERAPEUTIC PROTEINS.
         (c) By  written  notice  to HGS,  SP  within  its sole  discretion  may
surrender all rights to a  THERAPEUTIC  PROTEIN as to which SP has exercised its
option under Paragraph 9.3(a), and at such time, such THERAPEUTIC  PROTEIN shall
become a  THERAPEUTIC  PROTEIN as to which HGS has  exclusive  rights.  SP shall
grant to HGS a license to any and all technology,  data and information which SP
has developed with respect to such surrendered  THERAPEUTIC  PROTEIN.  Effective
upon such surrender of such THERAPEUTIC  PROTEIN,  for the purposes of Paragraph
9.3(b),  such THERAPEUTIC  PROTEIN shall not be counted as a THERAPEUTIC PROTEIN
as to which SP has exercised its option under Paragraph 9.3(a).
         (d) SB shall have no rights under the SP/SB  AGREEMENT  with respect to
any THERAPEUTIC PROTEIN as to which SP obtains rights under Paragraph 9.3(a).
                                       43
<PAGE>
10.      CONFIDENTIALITY
         ---------------

         10.1 Subject to  Paragraphs  10.2 and 10.3 and 10.4,  the parties agree
not to disclose  and/or provide to a THIRD PARTY  information  and/or  materials
received from another party and to use the  information  and materials  received
from the other party only as licensed hereunder.
         10.2 Unless otherwise restricted by this Agreement, the confidentiality
obligations of paragraph 10.1 shall not apply to  information  and/or  materials
which:
                  (i)     was known to the receiving party or generally known to
                          the public prior to its disclosure hereunder; or
                  (ii)    subsequently becomes known to the public by some means
                          other than a breach of this Agreement;
                  (iii)   is subsequently  disclosed to the receiving party by a
                          THIRD  PARTY  having  a  lawful  right  to  make  such
                          disclosure  and  who is not  under  an  obligation  of
                          confidentiality to the disclosing party;
                  (iv)    is  required  by  law  or  bona  fide  legal   process
                          regulation,  rule,  act or order  of any  governmental
                          agency or authority to be disclosed, provided that the
                          party  required  to  make  the  disclosure  takes  all
                          reasonable    steps   to   restrict    and    maintain
                          confidentiality   of  such   disclosure  and  provides
                          reasonable   notice   to  the  party   providing   the
                          information and/or materials;
                  (v)     is approved for release by the parties, or
                  (vi)    is independently  developed by the employees or agents
                          of a party or their respective  AFFILIATES without any
                          knowledge of the information and/or
                                       44
<PAGE>
                          materials  provided by another  party,  provided  that
                          such   independent   development   can   be   properly
                          demonstrated  by the party  disclosing the information
                          and/or materials.
         10.3 (a) Notwithstanding Paragraph 10.1, SP may disclose and/or provide
LICENSED  TECHNOLOGY  to a THIRD  PARTY who (i)  receives  a license  from SP to
LICENSED  TECHNOLOGY in conjunction with a license to an SP PRODUCT as permitted
by Paragraph 2.9 hereof,  or (ii) is a THIRD PARTY contractor  assisting SP with
respect  to an SP  PRODUCT,  provided  that  such  THIRD  PARTY  enters  into an
agreement  as  provided  in  Paragraph  10.4,  and such  THIRD  PARTY  agrees to
confidentiality and non-use obligations essentially identical to Paragraph 10.1.
              (b) Unless  restricted by other provisions of this Agreement,  the
obligations  of  Paragraph  10.1 shall not  restrict the ability of HGS or SB to
disclose  information  and/or provide materials to a THIRD PARTY,  provided that
such THIRD PARTY  enters into an  agreement  by which the THIRD PARTY  agrees to
confidentiality and non-use obligations essentially identical to Paragraph 10.1.
         10.4 In the event that SP  intends to  transfer  or  disclose  LICENSED
TECHNOLOGY to a THIRD PARTY  contractor  as permitted by Paragraph  10.3 no such
transfer or  disclosure  shall take place until such THIRD PARTY  enters into an
agreement  with SP by which SP is granted  ownership of or a license  (including
the right to grant  sublicenses)  to all  inventions  (and patent  rights  based
thereon) which result from the use of LICENSED  TECHNOLOGY.  Any such inventions
and  patents  shall be SP  TECHNOLOGY  and SP  PATENTS  subject to the terms and
conditions of this Agreement,  provided,  however,  that any such inventions and
patents which
                                       45
<PAGE>
result from any incidental or immaterial use of LICENSED TECHNOLOGY shall not be
SP TECHNOLOGY or SP PATENTS.
         10.5 All  confidential  information  disclosed  by one party to another
party shall remain the  intellectual  property of the disclosing  party.  In the
event  that a court  or other  legal or  administrative  tribunal,  directly  or
through an appointed  master,  trustee or receiver,  assumes partial or complete
control over the assets of a party to this Agreement  based on the insolvency or
bankruptcy of such party,  the bankrupt or insolvent party shall promptly notify
the court or other tribunal (i) that confidential  information received from the
other party under this Agreement  remains the property of another party and (ii)
of the  confidentiality  obligations  under this  Agreement.  In  addition,  the
bankrupt or insolvent  party  shall,  to the extent  permitted by law,  take all
steps  necessary  or  desirable  to maintain  the  confidentiality  of the other
party's(ies')  confidential  information  and to insure  that the  court,  other
tribunal or appointee  maintains  such  information  in confidence in accordance
with the terms of this Agreement.
         10.6 (a) No public  announcement  concerning  (i) the  existence  of or
terms of this  Agreement,  (ii) research  and/or  discoveries  made by SP, (iii)
milestones achieved by SP, and (iv) exercise by SP of rights and options granted
under this Agreement, shall be made, either directly or indirectly, by any party
to this Agreement  without prior written notice to the other parties and, except
as may be legally required,  or as may be legally required for a public offering
of  securities,  or as may be required for  recording  purposes,  without  first
obtaining the approval of the other  parties and  agreement  upon the nature and
text  of  such  announcement.  The  party  desiring  to  make  any  such  public
announcement  shall  inform the other  parties of the proposed  announcement  or
disclosure in reasonably sufficient time prior to public release, and
                                       46
<PAGE>
shall provide the other  parties with a written copy thereof,  in order to allow
such  other  parties to  comment  upon such  announcement  or  disclosure.  This
Paragraph  10.6  shall not apply to any  information  in an public  announcement
which is  information  essentially  identical  to that  contained  in a previous
public announcement agreed to pursuant to this paragraph.
                  (b) HGS and/or SB may provide a  COLLABORATION  PARTNER with a
copy of this Agreement.
         10.7 Without the written consent of HGS and SB, SP shall not submit for
written or oral publication any manuscript,  abstract or the like which includes
SP  TECHNOLOGY  which is or is  directed  to a TARGET  and/or  is a  THERAPEUTIC
PROTEIN prior to the earlier of (i) eighteen  months after SP files an SP PATENT
which  claims  such  TARGET or  THERAPEUTIC  PROTEIN  or (ii) with  respect to a
THERAPEUTIC  PROTEIN,  the date on which SP obtains  rights to such  THERAPEUTIC
PROTEIN  pursuant to Section 7 or (iii) such TARGET or  THERAPEUTIC  PROTEIN has
been  published  in a printed  publication  other than  through a breach of this
paragraph 10.7.

11.      PATENT PROSECUTION AND LITIGATION
         ---------------------------------

         11.1 A party  shall have and  retain  sole and  exclusive  title to all
inventions,  discoveries,  designs, works of authorship and other know-how which
are made, conceived,  reduced to practice or generated by its employees, agents,
or other persons acting under its authority. As to all inventions,  discoveries,
designs,  works of authorship  and other know-how  made,  conceived,  reduced to
practice or generated  jointly by employees,  agents,  or other  persons  acting
under the  authority of two or more  parties,  such  parties  shall own an equal
undivided interest
                                       47
<PAGE>
therein. In the event of jointly owned inventions,  in the case where HGS is one
of the joint owners,  HGS shall be responsible  for the filing,  prosecution and
maintenance of patents and patent applications  directed thereto under the terms
and  conditions  of  Paragraph  11.2 and if HGS is not one of the joint  owners,
then, to the extent that SP is a joint owner,  SP shall be  responsible  for the
filing,  prosecution and  maintenance  thereof under the terms and conditions of
Paragraph  11.3,  in each  case,  however,  each of the  joint  owners  shall be
responsible  for an equal share of the cost and expense  thereof.  HGS or SP, as
appropriate,  shall consult with all joint owners with respect to strategies for
filing, prosecution and maintenance of patents and patent applications for which
it bears  responsibility  under  this  Section  11.1,  and shall keep such joint
owners  reasonably  informed with regard to filing,  prosecution and maintenance
activity for such patents and patent applications,  provided,  however, that HGS
or SP, as appropriate,  shall have final decision-making  authority with respect
to filing,  prosecution and  maintenance of any patents and patent  applications
for which it is responsible. If a joint owner does not desire to file, prosecute
or  maintain a patent or patent  application  to a joint  invention,  such owner
shall  assign its  ownership  interest  therein to the other joint  owner(s) and
shall no longer be responsible for the cost and expense thereof,  and shall have
no further  right to  consult,  review or comment  with  respect to the  filing,
prosecution  and maintenance of said patent or patent  application.  All patents
and patent applications to joint inventions which are LICENSED TECHNOLOGY and/or
SP TECHNOLOGY shall be LICENSED PATENTS and SP PATENTS, respectively, subject to
the terms and conditions of this Agreement;  otherwise, any joint owner shall be
free to dispose of its interest therein without accounting to any other owner.
                                       48
<PAGE>
         11.2 (a) HGS and SB, as the case may be,  shall  have the right  within
its sole discretion to prepare,  file,  prosecute and maintain  LICENSED PATENTS
owned by HGS and SB, respectively.  With respect to LICENSED PATENTS as to which
SP retains a license  hereunder,  subject to Paragraph 11.10, HGS and SB, as the
case may be, shall keep SP  reasonably  informed  with respect to the filing and
prosecution thereof (including interference proceedings).  In the event that HGS
or SB, as the case may be, and do not intend to prepare,  file, prosecute and/or
maintain  patent  protection in any country with respect to LICENSED  TECHNOLOGY
(other than  expressed  sequence  tags  (ESTs))  which is or would be a LICENSED
PATENT as to which SP  retains a license  hereunder,  HGS or SB, as the case may
be,  shall,  at SP's  option,  do so at the cost and expense of SP. In the event
that SB or a COLLABORATION  PARTNER also makes such a request in a country, such
costs shall be apportioned between SP and the requesting entity(ies).
                  (b) SP shall  have the right  within  its sole  discretion  to
prepare,  file, prosecute and maintain SP PATENTS. With respect to SP PATENTS as
to which HGS retains a license  hereunder,  subject to Paragraph 11.11, SP shall
keep HGS reasonably  informed with respect to the filing and prosecution thereof
(including  interference  proceedings).  In the event that SP does not intend to
prepare,  file,  prosecute and/or maintain patent protection in any country with
respect  to SP  TECHNOLOGY  which is or would be an SP  PATENT  as to which  HGS
retains a license  hereunder,  SP shall,  at HGS' option,  do so at the cost and
expense of HGS.
                  (c) SP will  provide  HGS or SB,  as  appropriate,  reasonable
assistance to enable HGS or SB, as appropriate,  to prepare, file, prosecute and
maintain LICENSED PATENTS
                                       49
<PAGE>
pursuant to section 11.2(a). HGS will provide SP reasonable assistance to enable
SP to prepare,  file,  prosecute  and  maintain  SP PATENTS  pursuant to section
11.2(b).
         11.3 Each party, on behalf of itself,  its AFFILIATES and its and their
respective directors, employees, officers, shareholders,  agents, successors and
assigns  hereby  waives any and all  actions  and  causes of action,  claims and
demands  whatsoever,  in law or equity  of any kind it or they may have  against
another party, its AFFILIATES and its or their respective  officers,  directors,
employees, shareholders, agents, successors and assigns, which may arise
 from performance of patent  activities  under this Section,  except those which
result from gross negligence, recklessness, or willful misconduct.
         11.4 (a) In the event of the  institution  of any suit by a THIRD PARTY
against SP or its licensees for patent  infringement  involving the manufacture,
use,  import,  export,  offer for sale,  sale,  distribution  or marketing of SP
PRODUCT,  SP shall promptly notify HGS in writing. As between HGS, SB and SP, SP
shall be solely  responsible  for the cost and  expense  of such  action and any
liability which results therefrom.
                  (b) In the  event  of the  institution  of any suit by a THIRD
PARTY  against  HGS  and/or  SB,  or  their  respective  licensees,  for  patent
infringement  involving the manufacture,  use, import,  export,  offer for sale,
sale,  distribution  or  marketing of any PRODUCT sold by HGS and/or SB or their
respective  licensees involving or developed using LICENSED TECHNOLOGY and/or SP
TECHNOLOGY,  HGS and/or SB shall promptly notify SP in writing.  As between HGS,
SB and SP, HGS and/or SB, as  appropriate,  shall be solely  responsible for the
cost and expense of such action and any liability which results therefrom.
                                       50
<PAGE>
         11.5 In the  event  that  HGS,  SB or SP  becomes  aware of  actual  or
threatened  infringement  of a SP  PATENT or  LICENSED  PATENT  anywhere  in the
TERRITORY,  that party shall promptly  notify the other parties in writing.  The
owner of the SP PATENT or LICENSED PATENT shall have the first right but not the
obligation to bring,  at its own expense,  an  infringement  action  against any
THIRD PARTY and to use another  party's  name in  connection  therewith.  If the
owner of the patent does not commence a particular  infringement  action  within
ninety (90) days, the other party,  after notifying the owner in writing,  shall
be entitled  to bring such  infringement  action,  in its own name and/or in the
name of the patent  owner,  at its own  expense to the extent that such party is
licensed thereunder. The foregoing notwithstanding, in the event that an alleged
infringer certifies pursuant to 21 U.S.C.  ss.355(b)(2)(A)(iv) against an issued
SP PATENT or LICENSED PATENT covering a PRODUCT, as between the patent owner and
the owner of the PRODUCT, the party receiving notice of such certification shall
immediately notify the other party of such  certification,  and if fourteen (14)
days  prior to  expiration  of the forty  five (45) day  period  set forth in 21
U.S.C.  ss.355(c)(3)(C),  the owner of the SP PATENT or LICENSED PATENT fails to
commence  an  infringement  action,  the  party  receiving  notice,  in its sole
discretion,  at its own expense and to the extent that it is licensed  under the
SP PATENT or  LICENSED  PATENT,  shall be  entitled  to bring such  infringement
action  in its own  name  and/or  in the name of the  patent  owner.  The  party
conducting an action under this  Paragraph 11.5 shall have full control over its
conduct, including settlement thereof provided such settlement shall not be made
without the prior written consent of the other licensing party or licensed party
if it would  adversely  affect the patent  rights of such party.  The  licensing
party (i.e., the patent owner) and the licensed party (e.g., the
                                       51
<PAGE>
owner of the PRODUCT) shall  reasonably  assist one another and cooperate in any
such  litigation  at the other's  request , each such party paying its own costs
and expenses.  The party conducting the litigation shall periodically  reimburse
the other  party(ies) for its reasonable and actual  out-of-pocket  expenses for
assisting in the  litigation , which  reimbursement  shall be made within thirty
(30) days of receipt by the party conducting the litigation of itemized invoices
from the assisting party documenting such expenses.
         11.6 Any recovery made by a party as the result of an action for patent
infringement  it has conducted  under  Paragraph  11.5 shall be  distributed  as
follows:
                  (i) The party  conducting  the action shall recover its actual
                  out -of-pocket expenses. 
                  (ii) To the extent that the recovery exceeds the total of item
                  (i),  the  excess  shall be kept by the party  conducting  the
                  action,  provided,  however,  that to the extent  that (a) the
                  recovery is based on an award of lost  sales/profits,  and (b)
                  the party  conducting the action would have incurred a royalty
                  obligation to another  party based upon such sales,  the party
                  to whom such  royalties  would  have been due shall  receive a
                  proportion of the excess recovery corresponding to the royalty
                  percentage it would have otherwise been due.
         11.7  The  parties  shall  periodically  keep  one  another  reasonably
informed of the status of and of their respective  activities regarding any such
litigation or settlement thereof.
         11.8 To the extent  that the owner of a SP PATENT or a LICENSED  PATENT
also owns a PRODUCT  (covered  by an NDA or HRD)  which  PRODUCT is covered by a
granted claim of said SP PATENT or LICENSED PATENT,  the owner of said SP PATENT
or
                                       52
<PAGE>
LICENSED  PATENT shall have the first right to seek  extensions  of the terms of
the patent and to seek to obtain SPCs. If the owner of a SP PATENT or a LICENSED
PATENT  does not own a PRODUCT  covered by a granted  claim of said SP PATENT or
LICENSED  PATENT,  then the owner of a PRODUCT  (covered by an NDA or HRD) which
PRODUCT is licensed under and is covered by a granted claim of said SP PATENT or
LICENSED  PATENT  shall  have the right to seek  extensions  of the terms of the
patent and to seek to obtain SPCs. Where more than one (1) PRODUCT is covered by
a granted  claim of the same SP PATENT or the same LICENSED  PATENT,  as between
SP, HGS, SB and  COLLABORATION  PARTNERS,  the right to seek  extensions  of the
terms of the patent and to obtain  SPCs shall be granted by the patent  owner to
the  first  of SP,  HGS,  SB and the  COLLABORATION  PARTNERS,  who is  licensed
thereunder to submit to the patent owner,  in writing,  a request to obtain such
rights  with  respect to a PRODUCT  (covered by an NDA or HRD) which is approved
for  marketing  and/or  sale in at least one  country in which said SP PATENT or
LICENSED PATENT is in force.  Each party shall assist the other in the obtaining
of such  extensions or SPCs including by  authorizing  the other party to act as
its agent.
         11.9 (a) All rights and  licenses  granted  under or  pursuant  to this
Agreement by one party to another party are, for all purposes of Section  365(n)
of Title 11 of the U.S.  Code ("Title 11"),  licenses of rights to  intellectual
property as defined in Title 11. The  licensing  party agrees during the term of
this  Agreement  to  maintain  and  preserve  any  current  copies  of all  such
intellectual  property  which are in existence  and in its  possession as of the
commencement  of a case under Title 11 by or against the licensing  party.  If a
case is commenced by or against the licensing party under Title 11, then, unless
and until this Agreement is rejected as provided in
                                       53
<PAGE>
Title 11, the licensing party (in any capacity, including  debtor-in-possession)
and its  successors  and  assigns  (including,  without  limitation,  a Title 11
Trustee) shall,  as the party who is a licensee may elect in a written  request,
immediately upon such request (A) (i) perform all of the obligations provided in
this  Agreement to be performed by the licensing  party,  or (ii) provide to the
party  who  is  a  licensee  all  such  intellectual   property  (including  all
embodiments thereof) held by the licensing party and such successors and assigns
as of the  commencement  of a case under  Title 11 by or against  the  licensing
party and from time to time thereafter, and (B) not interfere with the rights of
the  licensing   party  as  provided  in  this   Agreement,   or  any  agreement
supplementary   hereto,  to  such  intellectual  property  (including  all  such
embodiments  thereof,  including any right of the licensing party to obtain such
intellectual property or such embodiment) from any other entity.
                  (b)  If a  Title  11  case  is  commenced  by or  against  the
licensing  party,  this  Agreement  is  rejected as provided in Title 11 and the
party who is a licensee  elects to retain its rights  hereunder  as  provided in
Title   11,   then   the   licensing   party   (in   any   capacity,   including
debtor-in-possession)  and  its  successors  and  assigns  (including,  without,
limitation, a Title 11 Trustee) shall provide to the party who is a licensee all
such  intellectual  property  (including  all  embodiments  thereof) held by the
licensing party and such successors and assigns  immediately  upon the party who
is a licensee's written request thereof. Whenever, the licensing party or any of
its  successors  or assigns  provides to the party who is a licensee  any of the
intellectual property licensed hereunder (or any embodiment thereof) pursuant to
this Paragraph 11.9, the party who is a licensee shall have the right to perform
the   obligations  of  the  licensing  party  hereunder  with  respect  to  such
intellectual property, but neither such provision nor such
                                       54
<PAGE>
performance  by the party who is a licensee  shall release the  licensing  party
from any such  obligation  or  liability  for failing to perform  it;  provided,
however, that in such event the party who is a licensee shall not be entitled to
compel specific  performance by the licensing party under this Agreement  except
to the extent of enforcing the exclusivity of the license granted hereunder.
                  (c) All rights, powers,  remedies,  obligations and conditions
of the party who is a licensee  provided  herein are in  addition  to and not in
substitution  for any and all other rights,  powers,  remedies,  obligations and
conditions  of the  licensing  party  or the  party  who  is a  licensee  now or
hereafter existing at law or in equity (including, without limitation, Title 11)
in the event of the  commencement of a Title 11 case by or against the licensing
party.  The party who is a  licensee,  in  addition  to the  rights,  powers and
remedies  expressly  provided  herein,  shall be subject to all  obligations and
conditions,  and shall be entitled to exercise  all other such rights and powers
and resort to all other such remedies as may now or hereafter exist at law or in
equity  (including,  without  limitation,  Title 11) in such event.  The parties
agree that they intend the foregoing  rights and obligations of the party who is
a licensee to apply to the maximum extent  permitted by law,  including  without
limitation for purposes of Title 11, (i) the right of access to any intellectual
property  (including all  embodiments  thereof) of the licensing  party,  or any
third party with whom the licensing  party contracts to perform an obligation of
the licensing party under this  Agreement,  and, in the case of the third party,
which is  necessary  for the  development,  registration  and  manufacture  of a
product  licensed  hereunder,  and (ii) the right to contract  directly with any
third party  described in clause (i) in this sentence to complete the contracted
work.
                                       55
<PAGE>
         11.10  The  obligations  of HGS  and/or  SB to keep SP  informed  under
Paragraph  11.2(a)  shall only apply to LICENSED  PATENTS  which claim  LICENSED
TECHNOLOGY which HGS and/or SB is required to disclose to SP pursuant to Section
6.
         11.11 The obligation of SP to keep HGS informed under Paragraph 11.2(b)
shall not extend to any SP PATENT  directed to a  THERAPEUTIC  PROTEIN until the
earlier of publication of the SP PATENT and/or SP obtaining  exclusive rights to
the THERAPEUTIC PROTEIN under Section 7.

12.      STATEMENTS AND REMITTANCES
         --------------------------

         12.1 SP shall keep and  require  its  licensees  to keep  complete  and
accurate  records of all NET SALES of SP  PRODUCT  for which  royalties  are due
hereunder.  HGS shall have the right, at its expense, through a certified public
accountant  or like person  reasonably  acceptable  to SP, to examine  pertinent
financial  records  during regular  business  hours upon proper advance  written
notice  during  the life of this  Agreement  and for six (6)  months  after  its
termination  for  the  purpose  of  verifying  and  reporting  to  HGS as to the
computation of the royalty payments made hereunder; provided, however, that such
examination  shall not take place more often than once a year and not later than
forty-five (45) days after written request is made;  provided  further that such
accountant  shall report only as to the accuracy of the royalty  statements  and
payments, including the magnitude and source of any discrepancy.  Neither SP nor
its licensees shall be required to maintain such records for more than three (3)
years. The accountant shall execute customary  confidentiality  agreements prior
to any examination, reasonably satisfactory in form
                                       56
<PAGE>
and substance to SP, to maintain in confidence all  information  obtained during
the course of any such  examination,  except for disclosure to HGS, as necessary
for the above purpose.
         12.2 Within sixty (60) days after the close of each  calendar  quarter,
SP shall deliver to HGS a true  accounting of all SP PRODUCT  subject to royalty
hereunder  sold by it and its  licensees and  distributors  during such calendar
quarter and shall at the same time pay all royalties  due. In the event that the
royalty  rate  changes in a calendar  quarter with respect to an SP PRODUCT as a
result of the NET SALES of such SP PRODUCT  for such  calendar  year  reaching a
level at which there is a change in royalty  rate as provided in  Paragraph  3.2
("New Royalty  Rate") then the royalties  which are paid by SP for such calendar
quarter and the subsequent  calendar  quarters for such calendar year (until the
royalty rate is again  changed)  shall be  determined  and paid based on the New
Royalty Rate, and in addition,  the royalties for the previous calendar quarters
for such  calendar  year  for such SP  PRODUCT  shall be  recomputed  at the New
Royalty Rate,  and the payment for the calendar  quarter in which there is a New
Royalty Rate shall be adjusted for the difference between the royalties paid for
such SP PRODUCT for the previous  calendar  quarters for such  calendar year and
the  royalties  for such  previous  calendar  quarters  for such  calendar  year
calculated by use of the New Royalty  Rate.  Such  accounting  shall show sales,
each  calculation of NET SALES and the  calculation of currency  conversion on a
country-by-country basis and  SP-PRODUCT-by-SP-PRODUCT  basis, and recalculation
of royalties based on a New Royalty Rate, if applicable.
         12.4 All royalties and other payments due under this Agreement shall be
payable in U.S. dollars.
                                       57
<PAGE>
          12.5 All  royalties,  with the  exception of those payable on sales to
customers in the United States,  shall be paid by Schering-Plough  Ltd. from its
office in Lucerne,  Switzerland.  Royalties  payable on U.S. sales shall be paid
directly to HGS by Schering  Corporation  from its  offices in  Kenilworth,  New
Jersey.  Royalties  payable on sales in countries  other than the United  States
shall be calculated by multiplying the appropriate  royalty rate times the sales
in each currency in which they are made and converting the resulting amount into
United States  dollars,  at the rates of exchange used by Schering  Corporation,
for reporting such sales for United States financial statement purposes.  A copy
of SP's current policy for  bookkeeping  exchange rates is set forth in Appendix
G.  If,  due  to  restrictions   or  prohibitions   imposed  by  a  national  or
international authority, payments cannot be made as aforesaid, the parties shall
consult  with a view to finding a prompt and  acceptable  solution,  and SP will
deal with such monies as HGS may lawfully direct at no additional  out-of-pocket
expense to SP. Notwithstanding the foregoing, if royalties cannot be remitted to
HGS for any reason  within six (6) months after the end of the calendar  quarter
during  which  they are  earned,  then SP  shall be  obligated  to  deposit  the
royalties in a bank account in  Switzerland  in the name of HGS. SP shall deduct
any  withholding  taxes which SP is obligated to withhold in a country  based on
royalties or  milestones  due to HGS based on sales in such country from royalty
or milestone payments due HGS for such country under this Agreement and pay them
to the proper  authorities  as required by applicable  laws.  SP shall  maintain
official receipts of payment of any withholding taxes and forward these receipts
to HGS within sixty (60) days.

13.      TERM AND TERMINATION
         --------------------
                                       58
<PAGE>
         13.1 This Agreement shall come into effect as of the EFFECTIVE DATE and
shall remain in full force and effect unless  earlier  terminated as provided in
this Section 13.
         13.2 In the event SP fails to make a royalty  or  milestone  payment to
HGS under this  Agreement  with  respect to a SP PRODUCT,  when due, or fails to
meet its  obligations  under  Section 8 of this  Agreement  with respect to a SP
PRODUCT, in addition to any other remedy which it may have, HGS may notify SP in
writing that all of SP's rights with respect to such SP PRODUCT shall  terminate
as of thirty (30) days after such  written  notice and SP's rights with  respect
thereto  shall  terminate  unless such payment is made or such failure is cured,
prior to the expiration of such thirty (30) day period.
         13.3  In the  event  that  SP  fails  to make a  payment  to HGS  under
Paragraph 3.1 or under  Paragraph 5.1, when due, in addition to any other remedy
which HGS may have,  HGS may notify SP in writing of such  failure and that this
Agreement  shall  terminate in its entirety and if SP fails to make such payment
within thirty (30) days thereafter, this Agreement shall terminate.
         13.4 In the  event  that HGS  and/or  SB fails to meet its  obligations
under  Section 6, in  addition  to any other  remedy  which SP may have,  SP may
notify HGS or SB, in writing,  as the case may be, of such failure and that this
Agreement  shall  terminate in its entirety as to HGS and/or SB, as the case may
be,  and if HGS or SB,  as the case may be,  fails to cure such  failure  within
thirty (30) days thereafter,  this Agreement shall terminate with respect to HGS
or SB, as the case may be, in its entirety.
         13.5 Any party, may terminate this Agreement as to another party if, at
any time,  such other  party  shall file in any court or agency  pursuant to any
statute or regulation of any state or
                                       59
<PAGE>
country,  a petition in bankruptcy or insolvency or for reorganization or for an
arrangement  or for the  appointment of a receiver or trustee of the party or of
its assets,  or if such other party proposes a written  agreement of composition
or  extension  of its debts,  or if such  other  party  shall be served  with an
involuntary  petition against it, filed in any insolvency  proceeding,  and such
petition shall not be dismissed within sixty (60) days after the filing thereof,
or if such  other  party  shall  propose  or be a party  to any  dissolution  or
liquidation,  or if such other party shall make an assignment for the benefit of
creditors.
          13.6 Neither HGS nor SP nor SB shall have the right to terminate  this
Agreement except with respect to HGS and SP under paragraphs 13.3, 13.4 and with
respect to HGS, SP and SB under paragraph 13.5, provided,  however, that nothing
in this  Agreement  shall limit any  remedies  for breach which may be available
pursuant to a judgment of a court,  in law or equity,  including  termination of
this Agreement or of any or all rights hereunder, except that any action seeking
remedies for breach of this  Agreement  shall be conducted  in  accordance  with
Section 18.
         13.7 In the  event  that  prior  to one (1) year  after  the end of the
INITIAL  RESEARCH TERM, SP has not obtained the full length DNA coding  sequence
for each TARGET  encompassed by an ANTIBODY  RESEARCH PLAN and has not certified
in writing to HGS that such sequence(s) has been obtained, HGS by written notice
to SP may terminate  all rights and licenses to such  TARGET(S) and the ANTIBODY
PRODUCT(S)  encompassed  by such ANTIBODY  RESEARCH  PLAN(S) and such rights and
licenses  shall  terminate  thirty (30) days  thereafter  unless SP prior to the
expiration of such thirty (30) days has obtained such sequence(s)
                                       60
<PAGE>
and has  provided to HGS such  certification.  Upon such  termination,  SP shall
discontinue all work encompassed by such ANTIBODY RESEARCH PLAN.
         13.8 In the event that prior to one (1) year after the later of the end
of the INITIAL  RESEARCH TERM or the EXTENDED TERM, SP has not obtained the full
length DNA coding  sequence for each TARGET  encompassed by a DRUG RESEARCH PLAN
and has not certified in writing to HGS that such sequence(s) has been obtained,
HGS by  written  notice to SP may  terminate  all rights  and  licenses  to such
TARGET(s) and the DRUG PRODUCT(s)  encompassed by such DRUG RESEARCH PLAN(s) and
such rights and licenses shall terminate  thirty (30) days thereafter  unless SP
prior to the  expiration of such thirty (30) days has obtained such  sequence(s)
and has  provided to HGS such  certification.  Upon such  termination,  SP shall
discontinue all work encompassed by such DRUG RESEARCH PLAN(s).

14.      RIGHTS AND DUTIES UPON TERMINATION
         ----------------------------------

         14.1  Notwithstanding  termination  of this  agreement,  the rights and
obligations  of the  parties  under  Sections  10,  12,  14,  16,  18 and 30 and
paragraphs 2.8, 2.9, 2.10, 3.1(b), and 5.1(b), shall survive such termination.
         14.2  Termination  of the Agreement in accordance  with the  provisions
hereof  shall not limit  remedies  which may be  otherwise  available  in law or
equity.
         14.3 Other than  termination  of this  Agreement  pursuant to Paragraph
13.4 or with  respect to an SP PRODUCT as to which  rights have been  terminated
under Paragraph  13.2,  SP's obligation to pay royalties and milestone  payments
for SP PRODUCT shall survive such termination.
                                       61
<PAGE>
15.      WARRANTIES AND REPRESENTATIONS
         ------------------------------

         15.1 Each of HGS, SB and SP hereby  represents,  warrants and covenants
to the other, as of the EFFECTIVE DATE, as follows:
                  (a) it is a corporation  duly organized and validity  existing
under the laws of the state or other jurisdiction of incorporation or formation;
                  (b) the execution,  delivery and performance of this Agreement
by such party has been duly authorized by all requisite corporate action;
                  (c) it has the power and authority to execute and deliver this
Agreement  and  to  perform  its  obligations  hereunder,   including,   without
limitation,  the right,  power and authority to grant the licenses under Section
2;
                  (d) the execution,  delivery and  performance by such party of
this Agreement and its compliance  with the terms and provisions  hereof to such
party's best  knowledge  does not conflict  with or result in a breach of any of
the terms and provisions of or constitute a default under (i) a loan  agreement,
guaranty, financing agreement,  agreement affecting a product or other agreement
or instrument  binding or affecting it or its property;  (ii) the  provisions of
its charter documents or bylaws; or (iii) any order, writ,  injunction or decree
of any court or governmental authority entered against it or by which any of its
property is bound;
                  (e) this Agreement  constitutes such party's legal,  valid and
binding obligation  enforceable against it in accordance with its terms subject,
as to enforcement, to bankruptcy,  insolvency,  reorganization and other laws of
general  applicability  relating to or  affecting  creditors'  rights and to the
availability of particular remedies under general equity principles.
                                       62
<PAGE>
         15.2 HGS, SB and SP, as the case may be, hereby represent, warrant, and
covenant to a party receiving a license hereunder as follows:
                  (a) as of the EFFECTIVE DATE,  there are no claims,  judgments
or  settlements  against or owed by HGS or SB, as the case may be, or pending or
threatened claims or litigation, in each case relating to HGS' or SB's interest,
as the case may be, in or to LICENSED PATENTS or LICENSED TECHNOLOGY; and
                  (b) HGS,  SB and SP, as the case may be,  has not and will not
grant any rights or licenses to any person or entity which is inconsistent  with
the rights  and  licenses  granted  by HGS,  SB, or SP, as the case may be, to a
party under this Agreement.
         15.3 HGS hereby  represents and warrants to SP that as of the EFFECTIVE
DATE:
                  (a)  without  having  made any  inquiry or  investigation,  no
information  has come to HGS' attention  which causes HGS to reasonably  believe
that SP will not be able to negotiate  license rights from each THIRD PARTY, who
is a licensor to HGS of the SOFTWARE  identified  in Appendix F as owned by said
THIRD  PARTY,  on terms that are at least as  favorable  to SP as those given by
such THIRD PARTY to HGS;
                  (b)  without  having  made an  inquiry  or  investigation,  no
information  has come to HGS' attention  which causes HGS to reasonably  believe
that the SOFTWARE to be provided to SP by HGS as of the EFFECTIVE DATE infringes
any patent, copyright,  trademark or trade secret right of any THIRD PARTY which
has not been licensed by HGS;
                  (c) to HGS' best knowledge,  the list of SOFTWARE contained in
Appendix F is true, complete and correct in all material respects;
                                       63
<PAGE>
                  (d) to HGS' best  knowledge,  the list of hardware  components
set forth in Appendix F includes all of the material  components SP will require
to utilize the SOFTWARE at its  facilities  in the manner  contemplated  by this
Agreement and to receive in an electronic  format  compatible  with the SOFTWARE
all HGS TECHNOLOGY that is available in electronic format; and
                  (e) for a  period  of one (1)  year  from  the  date  that the
SOFTWARE is installed and is fully operational at SP's facilities,  the SOFTWARE
located  at HGS and  which  is and  will be used by HGS to  input,  format,  and
transmit  HGS  TECHNOLOGY  to SP in an  electronic  format will  function in the
manner intended by the parties.
         15.4 No party to this Agreement has in effect,  and after the EFFECTIVE
DATE no party shall enter into any written agreement (including, but not limited
to,  further   amendments  to  the   COLLABORATION   AGREEMENT)  that  would  be
inconsistent with its obligations under this Agreement.
         15.5 NOTHING IN THIS AGREEMENT SHALL BE CONSTRUED AS A WARRANTY THAT SP
PATENTS,  COLLABORATION  PATENTS OR LICENSED PATENTS ARE VALID OR ENFORCEABLE OR
THAT THEIR EXERCISE OR THE EXERCISE OF LICENSED TECHNOLOGY OR SP TECHNOLOGY DOES
NOT INFRINGE ANY PATENT  RIGHTS OF THIRD  PARTIES.  A HOLDING OF  INVALIDITY  OR
UNENFORCEABILITY  OF ANY SUCH PATENT,  FROM WHICH NO FURTHER APPEAL IS OR CAN BE
TAKEN,  SHALL NOT  AFFECT ANY  OBLIGATION  HEREUNDER,  BUT SHALL ONLY  ELIMINATE
ROYALTIES  OTHERWISE  DUE UNDER SUCH PATENT FROM THE DATE SUCH  HOLDING  BECOMES
FINAL.
                                       64
<PAGE>
         15.6 EXCEPT AS OTHERWISE EXPRESSLY SET FORTH HEREIN HGS, SB and SP MAKE
NO  REPRESENTATIONS  OR EXTEND ANY  WARRANTIES  OF ANY KIND,  EITHER  EXPRESS OR
IMPLIED, INCLUDING, BUT NOT LIMITED TO, WARRANTIES OF MERCHANTABILITY OR FITNESS
FOR A PARTICULAR PURPOSE.
         15.7 Each party  represents  and warrants to the other  parties  hereto
that any materials  provided by one party to another under this Agreement  shall
be used in compliance with all applicable laws and regulations.
         15.8 For the sole purpose of permitting SP to exercise its rights under
Paragraph  31.1,  HGS and SB each hereby  warrant and  represent  that after the
EFFECTIVE  DATE they shall each, as applicable,  promptly  provide to SP (i) any
agreement  entered  into prior to the end of the  INITIAL  RESEARCH  TERM with a
COLLABORATION  PARTNER  relating to LICENSED  TECHNOLOGY,  and any supplement or
amendment  thereto  entered into prior to the end of the INITIAL  RESEARCH  TERM
(ii) any agreement  with a THIRD PARTY prior to the end of the INITIAL  RESEARCH
TERM who is substituted for an existing  COLLABORATION  PARTNER in any agreement
and as a result becomes a COLLABORATION  PARTNER,  and (iii) any agreement prior
to the end of the  INITIAL  RESEARCH  TERM  that adds a  COLLABORATION  PARTNER,
provided that the aggregate of COLLABORATION PARTNERS shall be no more than four
(4) entities at any one time.
         15.9 HGS hereby  warrants  and  represents  that to the extent any data
and/or  information  included within  LICENSED  TECHNOLOGY was obtained from The
Institute for Genomic  Research  (TIGR),  TIGR has granted  rights to HGS to all
such data and/or information.
                                       65
<PAGE>
         15.10 No claim can be made or shall  exist with  respect to a breach of
warranty,  representation or covenant under Paragraph 15.1(a), (b), (d) and (e),
Paragraph 15.2(a), Paragraph 15.3 or 15.8 unless such claim is made prior to the
later of the end of the INITIAL RESEARCH TERM or EXTENDED TERM.
         15.11 In the event that an agreement with a COLLABORATION PARTNER has a
publication  provision which is more favorable to SP then Paragraph 10.7 of this
Agreement,  then SP may substitute such more favorable publication provision for
Paragraph  10.7 by  written  notice to HGS and SB within  sixty  days of receipt
thereof.

16.      INDEMNIFICATION
         ---------------

         16.1 SP shall defend, indemnify and hold harmless HGS, SB, licensors of
HGS and SB,  and each of their  respective  directors,  officers,  shareholders,
agents and employees, from and against any and all liability,  loss, damages and
expenses  (including  reasonable  attorneys'  fees)  as the  result  of  claims,
demands,  costs or judgments which may be made or instituted against any of them
arising out of the manufacture,  possession, distribution, use, testing, sale or
other  disposition of any SP PRODUCT by or through SP or any THIRD PARTY granted
rights by SP under this Agreement.  Notwithstanding the foregoing, SP shall have
no obligation under this Agreement to defend, indemnify or hold harmless SB with
respect to claims,  demands,  costs or judgments arising out of the manufacture,
possession,  distribution,  use,  testing,  sale or other  disposition of any SP
PRODUCT  which is a  CO-PROMOTION  PRODUCT (as defined in the SP/SB  AGREEMENT).
SP's  obligation to defend,  indemnify and hold harmless  shall include  claims,
demands, costs or judgments, whether for money damages or
                                       66
<PAGE>
equitable relief by reason of alleged personal injury  (including  death) to any
person or alleged property damage,  provided,  however,  the indemnity shall not
extend to any claims  against an  indemnified  party which result from the gross
negligence or willful  misconduct of such  indemnified  party. SP shall have the
exclusive right. to control the defense of any action which is to be indemnified
in whole by SP  hereunder,  including  the  right to select  counsel  reasonably
acceptable  to HGS or SB, as the case may be,  to defend  HGS or SB, as the case
may be, and to settle any claim,  provided that,  without the written consent of
HGS or SB,  as the case may be  (which  shall not be  unreasonably  withheld  or
delayed),  SP shall not agree to settle any claim against HGS or SB, as the case
may be, to the extent such claim has a material  adverse effect on HGS or SB, as
the case may be. The  provisions of this  paragraph  shall survive and remain in
full force and effect after any termination,  expiration or cancellation of this
Agreement and the  obligation  hereunder  shall apply whether or not such claims
are rightfully brought. SP shall require each licensee to agree to indemnify HGS
or SB, as the case may be, in a manner consistent with this paragraph.
         16.2 HGS shall defend,  indemnify and hold harmless SP, licensors of SP
and each of their  respective  directors,  officers,  shareholders,  agents  and
employees,  from and against any and all liability,  loss,  damages and expenses
(including reasonable attorneys' fees) as the result of claims,  demands,  costs
or judgments which may be made or instituted  against any of them arising out of
the  manufacture,   possession,   distribution,  use,  testing,  sale  or  other
disposition  by or through  HGS or any THIRD PARTY  granted  rights by HGS under
this  Agreement  of any PRODUCT in the HGS FIELD or the SP FIELD as to which HGS
is granted a license under an SP PATENT.  HGS's obligation to defend,  indemnify
and hold harmless shall include claims,
                                       67
<PAGE>
demands,  costs or judgments,  whether for money damages or equitable  relief by
reason of alleged  personal  injury  (including  death) to any person or alleged
property damage, provided, however, the indemnity shall not extend to any claims
against an indemnified  party which result from the gross  negligence or willful
misconduct of such  indemnified  party.  HGS shall have the  exclusive  right to
control the  defense of any action  which is to be  indemnified  in whole by HGS
hereunder,  including the right to select counsel reasonably acceptable to SP to
defend SP and to settle any claim, provided that, without the written consent of
SP (which shall not be unreasonably withheld or delayed), HGS shall not agree to
settle  any claim  against SP to the  extent  such claim has a material  adverse
effect on SP. The provisions of this paragraph  shall survive and remain in full
force and effect  after any  termination,  expiration  or  cancellation  of this
Agreement and HGS'  obligation  hereunder shall apply whether or not such claims
are rightfully brought. HGS shall require each licensee to agree to indemnify SP
in a manner consistent with this Paragraph 16.2.
         16.3 A person or entity  that  intends to claim  indemnification  under
this Section 16 (the  "Indemnitee")  shall promptly  notify the other party (the
"Indemnitor") of any loss,  claim,  damage,  liability,  or action in respect of
which the Indemnitee intends to claim such indemnification,  and the Indemnitor,
after it  determines  that  indemnification  is required of it, shall assume the
defense thereof with counsel  mutually  satisfactory  to the parties;  provided,
however, that an Indemnitee shall have the right to retain its own counsel, with
the fees and expenses to be paid by the Indemnitor if Indemnitor does not assume
the defense; or, if representation of such Indemnitee by the counsel retained by
the  Indemnitor  would be  inappropriate  due to actual or  potential  differing
interests between such Indemnitee and any other
                                       68
<PAGE>
party represented by such counsel in such proceedings.  The indemnity  agreement
in this  Section 16 shall not apply to amounts paid in  settlement  of any loss,
claim,  damage,  liability or action if such settlement is effected  without the
consent of the Indemnitor, which consent shall not be withheld unreasonably. The
failure to deliver notice to the Indemnitor  within a reasonable  time after the
commencement  of any such action,  if  prejudicial to its ability to defend such
action,  shall relieve such Indemnitor of any liability to the Indemnitee  under
this Section 16, but the omission so to deliver  notice to the  Indemnitor  will
not relieve it of any  liability  that it may have to any  Indemnitee  otherwise
than under this Section 16. The Indemnitee  under this Section 16, its employees
and  agents,   shall   cooperate   fully  with  the  Indemnitor  and  its  legal
representatives in the investigations of any action,  claim or liability covered
by this indemnification.  In the event that each party claims indemnity from the
other  and one  party is  finally  held  liable  to  indemnify  the  other,  the
Indemnitor  shall  additionally be liable to pay the reasonable  legal costs and
attorneys'  fees  incurred  by the  Indemnitee  in  establishing  its  claim for
indemnity.

17.      FORCE MAJEURE
         -------------

         17.1 If the  performance  of any  party  of this  Agreement,  or of any
obligation under this Agreement,  is prevented,  restricted,  interfered with or
delayed by reason of any cause beyond the reasonable control of the party liable
to perform, unless conclusive evidence to the contrary is provided, the party so
affected shall, upon giving written notice to the other parties, be excused from
such performance to the extent of such prevention, restriction,  interference or
delay, provided that the affected party shall use its reasonable best efforts to
avoid or remove such causes of  non-performance  and shall continue  performance
with the utmost dispatch
                                       69
<PAGE>
whenever such causes are removed.  When such  circumstances  arise,  the parties
shall discuss what, if any,  modification  of the terms of this Agreement may be
required in order to arrive at an equitable solution.

18.      GOVERNING LAW
         -------------

         18.1  Except for  disputes  under  Section 11 which will be governed by
Federal  law and  brought  in the  Federal  District  Court  of  Delaware,  this
Agreement  shall be governed by and construed in accordance with the laws of the
State of Delaware without regard to the conflict of laws provisions  thereof and
the  exclusive  jurisdiction  and  venue  of any  action  with  respect  to this
Agreement  shall be in a state  court  of the  State  of  Delaware.  Each of the
parties hereto agrees to submit to the exclusive  jurisdiction and venue of such
court for the purpose of any such action.  Service of process in any such action
may be effected in the manner  provided in Section 21 for  delivery of notice or
in any other  manner  consistent  with  Delaware  law. In the event that a state
court or Federal  District  Court of the State of Delaware  holds that an action
cannot be brought and  maintained in a state court or Federal  District Court of
the State of  Delaware,  then such  action may be  brought  in any court  having
proper jurisdiction.

19.      SEPARABILITY
         ------------

         19.1 In the event any portion of this Agreement  shall be held illegal,
void or  ineffective,  the remaining  portions hereof shall remain in full force
and effect.
         19.2  If any of the  terms  or  provisions  of  this  Agreement  are in
conflict  with  any  applicable  statute  or rule of law,  then  such  terms  or
provisions shall be deemed inoperative to
                                       70
<PAGE>
the extent that they may conflict  therewith  and shall be deemed to be modified
to conform with such statute or rule of law.
         19.3 In the event that the terms and  conditions of this  Agreement are
materially  altered as a result of paragraphs 19.1 or 19.2, the parties will, in
good faith,  renegotiate  the terms and  conditions of this Agreement to resolve
any inequities.

20.      ENTIRE AGREEMENT
         ----------------

         20.1 This Agreement, together with the Schedules,  exhibits, Appendices
or other attachments hereto,  entered into as of the date written above, as well
as the SP/SB  AGREEMENT,  constitutes the entire  agreement  between the parties
relating to the subject matter hereof and  supersedes all previous  writings and
understandings.  No terms or  provisions  of this  Agreement  shall be varied or
modified by any prior or subsequent  statement,  conduct or act of either of the
parties, except that the parties may amend this Agreement by written instruments
specifically referring to and executed in the same manner as this Agreement.

21.      NOTICES
         -------

         21.1 Any notice  required or permitted  under this  Agreement  shall be
hand-delivered  or sent by express  delivery  service or certified or registered
mail,  postage  prepaid,  or by fax with written  confirmation  by mail,  to the
following addresses of the parties:
                  HGS
                          HUMAN GENOME SCIENCES, INC.
                          Suite 300
                          9410 Key West Avenue
                          Rockville, Maryland 20850
                                   Attention:  Chief Executive Officer
                                   (Fax #301-309-8512)
                                       71
<PAGE>

                  copy to:
                          Mr. Elliot Olstein
                          Carella, Byrne, Bain, Gilfillan, Cecchi, Stewart
                              & Olstein
                          6 Becker Farm Road
                          Roseland, New Jersey 07068
                                   (Fax #201-994-1744)

                  SP
                          SCHERING CORPORATION
                          2000 Galloping Hill Road
                          Kenilworth, New Jersey  07033
                          Attention:        Vice President, Business Development
                                   (Fax #: 908-298-5379)
                          cc:      Director of Licensing
                                   (Fax #: 908-298-2739)

                  and

                  SCHERING-PLOUGH LTD.
                  Toepferstrasse 5
                  CH-6004 Lucerne
                  Switzerland
                  Attention:  President
                                  (Fax # 41 41 4181626)

                  SB
                          SmithKline Beecham Corporation
                          709 Swedeland Road
                          King of Prussia, PA 19406
                          Attention:  Vice President, ATG
                                   (Fax # 610-270-6663)


         21.2 Any notice  required  or  permitted  to be given  concerning  this
Agreement shall be effective upon receipt by the party to whom it is addressed.

22.      ASSIGNMENT
         ----------
                                       72
<PAGE>
         22.1 This  Agreement and the licenses  herein  granted shall be binding
upon and inure to the benefit of the assignees and successors in interest of the
respective  parties.  Neither this Agreement nor any interest hereunder shall be
assignable by a party  without the written  consent of the other parties and any
attempted  assignment contrary to this paragraph shall be void and without force
and effect provided,  however,  that a party may assign this Agreement or any of
its rights or obligations  hereunder to any AFFILIATE or to any THIRD PARTY with
which  it  may  merge  or  consolidate,  or to  which  it  may  transfer  all or
substantially  all of its  assets  to  which  this  Agreement  relates,  without
obtaining  the consent of the other party,  provided  that the  assigning  party
remains  liable  under  this  Agreement  and that the THIRD  PARTY  assignee  or
surviving entity assumes in writing all of its obligations under this Agreement.

23.      RECORDING
         ---------

         23.1 SP, SB and HGS each shall have the right,  at any time, to record,
register,  or otherwise  notify this  Agreement in appropriate  governmental  or
regulatory offices anywhere in the TERRITORY, and HGS, SB or SP, as the case may
be,  shall  provide  reasonable  assistance  to  the  other  in  effecting  such
recording, registering or notifying.
         23.2 The parties acknowledge that this Agreement may be notified to the
European Community for compliance with applicable laws.

24.      COUNTERPARTS
         ------------
                                       73
<PAGE>
         24.1 This Agreement may be executed in any number of counterparts,  and
each  such  counterpart  shall be deemed an  original  instrument,  but all such
counterparts together shall constitute but one agreement.

25.      WAIVER.
         -------

         25.1 Any delay or  failure in  enforcing  a party's  rights  under this
Agreement  or any waiver as to a  particular  default or other  matter shall not
constitute  a waiver of such  party's  rights to the future  enforcement  of its
rights  under this  Agreement,  nor operate to bar the  exercise or  enforcement
thereof at any time or times thereafter, excepting only as to an express written
and signed waiver as to a particular matter for a particular period of time.
         25.2 Notwithstanding the foregoing,  in the event SP challenges whether
any payments  contemplated  hereunder  (including,  without limitation,  upfront
payments,  royalties or milestones) is due, it shall have the right to make such
payments under protest  (reserving all rights hereunder)  pending  resolution of
such dispute.

26.      INDEPENDENT RELATIONSHIP.
         -------------------------

         26.1 Nothing herein  contained shall be deemed to create an employment,
agency, joint venture or partnership  relationship between the parties hereto or
any of their  agents or  employees,  or any other legal  arrangement  that would
impose  liability  upon one  party  for the act or  failure  to act of the other
party.  No party shall have any power to enter into any contracts or commitments
or to incur any  liabilities in the name of, or on behalf of, the other parties,
or to bind the other parties in any respect whatsoever.
                                       74
<PAGE>
27.      EXPORT CONTROL.
         ---------------

         27.1 This Agreement is made subject to any restrictions  concerning the
export of products or technical  information  from the United  States of America
which may be imposed upon or related to HGS or SP or SB from time to time by the
government of the United States of America.  Furthermore, SP agrees that it will
not export, directly or indirectly,  any technical information acquired from HGS
or SB under this Agreement or any products  using such technical  information to
any country for which the United States  government or any agency thereof at the
time of  export  requires  an export  license  or other  governmental  approval,
without  first  obtaining  the written  consent to do so from the  Department of
Commerce or other agency of the United  States  government  when  required by an
applicable statute or regulation.

28.      CHANGE OF CONTROL.
         ------------------

         28.1 In the event that a "Change of  Control"  causes  HGS'  rights and
obligations  hereunder to pass to a "Major  Pharmaceutical  Company" (as defined
below)  then  such  Major  Pharmaceutical   Company  shall  set  up  appropriate
procedures  to  ensure  that  RESEARCH  PLANS  submitted  by SP are not used for
purposes  other than those of Section 7 and 8 of this  Agreement.  SP shall have
the right,  at its  expense,through  its own  designated  experts or like person
reasonably  acceptable  to such Major  Pharmaceutical  Company,  to examine HGS'
records  relating to such  procedures to verify and report to SP that such Major
Pharmaceutical Company has complied with such procedures. Such examination shall
occur during regular  business  hours upon proper advance  written notice during
the  life of this  Agreement  and for six  (6)  months  after  its  termination,
provided, however, that such examination shall not take place more often than
                                       75
<PAGE>
once a year and not later than  forty-five  (45) days after  written  request is
made and provided,  further, that such expert executes customary confidentiality
agreements  prior to any such audit  satisfactory  in form and substance to such
Major Pharmaceutical Company, to maintain in confidence all information obtained
during the course of any such audit except for disclosure to SP as necessary for
the above purpose.
         As  used  herein  "Change  of  Control"  shall  mean  (i)  any  merger,
reorganization,  consolidation  or combination in which HGS is not the surviving
corporation,  (ii) any "person" (within the meaning of Section 13(d) and Section
14(d)(2)  of the  Securities  Exchange  Act of 1934),  excluding  SP and/or  its
AFFILIATES,  is or becomes the  beneficial  owner,  directly or  indirectly,  of
securities of HGS  representing  50% or more of either (a) the  then-outstanding
shares  of  common  stock  of HGS or (b)  the  combined  voting  power  of  HGS'
then-outstanding voting securities; or (iii) approval by the shareholders of HGS
of a complete liquidation or the complete dissolution of HGS.
         As used herein the term "Major Pharmaceutical Company" means any entity
(including  any  corporation,   joint  venture,  partnership  or  unincorporated
entity),  as well as any  AFFILIATES  or  division(s)  of such  entity,  that is
engaged  in  the  research,  development,  manufacturing,   registration  and/or
marketing of drug products that are approved under NDAs,  HRDs,  ANDAs,  Product
License  Applications  (including without limitation any entity that is a member
of PhRMA).  "Major  Pharmaceutical  Company"  shall also mean any entity  which,
through or following a Change of Control,  at any time would either  itself meet
the definition of "Major Pharmaceutical  Company" in the prior sentence or would
be an AFFILIATE of any entity which is or would meet such definition.
                                       76
<PAGE>
29.       ARBITRATION.
          ------------

         29.1 Any matter or disagreement  which is subject to arbitration  under
Section 7 which has not been  resolved  within twenty (20) days, at SP's option,
shall be submitted to a mutually  selected  single  arbitrator  to so decide any
such matter or  disagreement.  The arbitrator  shall conduct the  arbitration in
accordance with the Rules of the American  Arbitration  Association,  unless the
parties  agree  otherwise.  If the  parties  are  unable to  mutually  select an
arbitrator,  the arbitrator  shall be selected in accordance with the procedures
of the American Arbitration Association.  The decision and award rendered by the
arbitrator shall be final and binding. Judgment upon the award may be entered in
any court having jurisdiction  thereof. Any arbitration pursuant to this section
shall be held in Washington, D.C., or such other place as may be mutually agreed
upon in writing by the parties.

30.      GUARANTEE
         ---------

         30.1  Schering   Corporation  and  Schering  Plough  Ltd.  jointly  and
severally   guarantee  that  their   respective   AFFILIATES  will  perform  all
obligations  under this Agreement as if the AFFILIATES were  signatories of this
Agreement.
         30.2  SmithKline  Beecham  Corporation  and  SmithKline  Beecham,  plc,
jointly and severally  guarantee that their  respective  AFFILIATES will perform
all obligations  under this Agreement as if the AFFILIATES  were  signatories of
this Agreement.

31.      MOST FAVORED LICENSEE.
         ----------------------
                                       77
<PAGE>
         31.1 In the event that prior to the  EFFECTIVE  DATE and/or  during the
INITIAL  RESEARCH TERM, HGS or SB, as applicable,  enters into any agreement set
forth in Paragraph 15.8 then SP may, within sixty (60) days of SP's receipt from
HGS or SB,  as the case may be, of a full,  complete  and  correct  copy of such
agreement,  elect to substitute all material terms of any such agreement for the
material  terms of this  Agreement.  HGS and/or SB, as the case may be, agree to
make representatives who are knowledgeable as to the terms and conditions of any
such   agreement   available   to  discuss  such  terms  and   conditions   with
representatives  of SP in order to permit SP to fairly determine  whether or not
to exercise such option.

32.      FURTHER ACTIONS
         ---------------

         32.1 Each party agrees to execute, acknowledge and deliver such further
instruments,  and to do all such other acts, as may be necessary or  appropriate
in order to carry out the purposes and intent of this Agreement.
                                       78
<PAGE>
     IN WITNESS WHEREOF, the parties,  through their authorized  officers,  have
executed this Agreement as of the date first written above.

SCHERING CORPORATION                                        SCHERING-PLOUGH LTD.


BY:________________________                                 BY:_________________
Title:_____________________                                 Title:




HUMAN GENOME SCIENCES, INC.


BY:_______________________
Title:____________________




SMITHKLINE BEECHAM CORPORATION


BY:_______________________
Title:____________________


SMITHKLINE BEECHAM, plc


BY:_______________________
Title:____________________
                                       79
<PAGE>
                                      INDEX



1.       DEFINITIONS......................................................... 2
         -----------

2.       SB AND HGS AND SP GRANTS AND COVENANTS..............................14
         --------------------------------------

3.       PAYMENTS AND ROYALTIES..............................................21
         ----------------------

4.       RESEARCH TERM AND RESEARCH PLANS....................................27
         --------------------------------

5.       ADDITIONAL PAYMENTS ................................................29
         -------------------

6.       TECHNOLOGY TRANSFER AND ADDITIONAL LICENSED TECHNOLOGY..............29
         ------------------------------------------------------

7.       THERAPEUTIC PROTEINS................................................34
         --------------------

8.       PRODUCT DEVELOPMENT.................................................41
         -------------------

9.       SP CO-RIGHTS........................................................41
         ------------

10.      CONFIDENTIALITY.....................................................44
         ---------------

11.      PATENT PROSECUTION AND LITIGATION...................................47
         ---------------------------------

12.      STATEMENTS AND REMITTANCES..........................................56
         --------------------------

13.      TERM AND TERMINATION................................................58
         --------------------

14.      RIGHTS AND DUTIES UPON TERMINATION .................................61
         ----------------------------------

15.      WARRANTIES AND REPRESENTATIONS  ....................................62
         ------------------------------

16.      INDEMNIFICATION.....................................................66
         ---------------

17.      FORCE MAJEURE.......................................................69
         -------------

18.      GOVERNING LAW ......................................................70
         -------------

19.      SEPARABILITY........................................................70
         ------------

20.      ENTIRE AGREEMENT....................................................71
         ----------------

21.      NOTICES.............................................................71
         -------

22.      ASSIGNMENT..........................................................72
         ----------

<PAGE>


23.      RECORDING...........................................................73
         ---------

24.      COUNTERPARTS........................................................73
         ------------

25.      WAIVER..............................................................74
         -------

26.      INDEPENDENT RELATIONSHIP............................................74
         -------------------------

27.      EXPORT CONTROL......................................................75
         ---------------

28.      CHANGE OF CONTROL...................................................75
         -----------------

29.      ARBITRATION.........................................................77
         -----------

30.      GUARANTEE...........................................................77
         ---------

31.      MOST FAVORED LICENSEE...............................................77
         ---------------------

32.      FURTHER ACTIONS.....................................................78
         ---------------

<PAGE>



                                   Appendix A


                         Drug or Antibody Research Plan
     (Provided at end of Initial Research Term in order to maintain License)

1.   Identification  of HGS  Clone  ID(s) or other  identification  of  Licensed
     Technology.

2.   Identification of the therapeutic utility of the Target.

3.   Status of full length cloning and gene expression.
     o        When  otherwise  publicly  disclosed  full  length  nucleotide
              sequence of the GENE  encoding  the TARGET or antigen used for
              drug discovery or ANTIBODY PRODUCT, respectively.

4.   Patent status

5.   o        Estimated  date for the  start of small  molecule  screening.  (No
              description of the screen(s) is required)
     o        Estimated date for start of laboratory  animal  immunization  (for
              Antibody Product).

6.   Annual Update:
     a)       R&D product code #/INN/generic name (as available)
     b)       Notification when a compound enters clinical development
     c)       Notification of clinical development status
     d)       Notification when regulatory approvals are sought




<PAGE>



                                   Appendix B

Takeda Chemical Industries, Ltd.
Merck KGaA
Synthelabo.


<PAGE>



                                   Appendix C

                   Preliminary Drug or Antibody Research Plan
                         (During Initial Research Term)

SP is engaged in a small molecule drug  screening  assay or other drug discovery
program  that  uses   Licensed   Technology   to  identify  a   ________________
(therapeutic  utility).  The Target used in such assay or drug discovery program
is putatively identified as a  ________________________  (biochemical/biological
function and/or  expression  specificity)  and is specifically  identified in SP
laboratory   notebook   _____________________,    page   _________________,   on
_____________ (Date).

SP will provide  annual updates that contain  information  on screening  status,
whether any lead  compounds  have been  identified  and,  if any,  developmental
status of  compound(s),  with  sufficient  information  for HGS to  monitor  the
progress of royalty-bearing drugs.




<PAGE>



                                   Appendix D

                              Protein Research Plan

o        Therapeutic Protein Identification

o        Rationale
         -        Brief description of hypothesis
         -        Expected indications for product

o        Biological data on protein
         -        Full length cloning
         -        Expression and purification
         -        Full  length  nucleotide  sequence  of  the  GENE encoding the
                  THERAPEUTIC PROTEIN

                           The  protein  preparation(s)  used  for  the in  vivo
                           activity   demonstration   must  be   purified  to  a
                           (previously  agreed) specified level, and evidence of
                           this purity  level must be  included in the  research
                           plan.

         -        In vivo  demonstration  of relevant  pharmacological  activity
                  (along with  supporting  demonstration  of in vitro or ex vivo
                  demonstrations of activity if available)

                           In  certain  instances,   in  vivo  demonstration  of
                           activity will not be possible for scientific reasons.
                           In  these  specific  cases,  an ex vivo  or in  vitro
                           demonstration of activity will be acceptable.

o        Patent  status  (full  length  gene patent  application  must have been
         filed)

o        Research and development plan

         This  plan need not  contain  detail of these  activities,  but  rather
         one-line descriptions of planned activities (with estimates of timing).
         Not all of these  plans/timing  will be available when the initial plan
         is  submitted,  but will be added as part of the  yearly  update of the
         plan.

         -        Further preclinical studies of activity
         -        Preclinical development
                  -        determination of pharmacokinetic profile
                  -        initiation of toxicology studies
                  -        steps to completion of IND package

         -        Certain key milestones in production/ scale-up
         -        Clinical development

                  Major phase transition (when available and appropriate)


<PAGE>



                                   Appendix E

Material Uses:                             Immaterial Uses:

1.  Use   of   relative   abundance        1.  A novel  HGS-derived  chemokine
information   of  cDNAs   from  HGS        is   being   investigated.   During
database   to   select,    from   a        development,  a  publication  in  a
collection     of     independently        scientific  journal describes a new
developed  ESTs, a candidate EST to        loop  structure for integrins  that
pursue  from which  emanates a gene        identifies tissue specificity. This
product.                                   structure   is   present   in   the
                                           chemokine. Subsequent search of the
2.  Query   of  the  HGS   database        public domain  database for similar
identifies a new homolog to a known        motifs leads to the  identification
public domain gene  sequence.  This        and  development of a public domain
information is incorporated  into a        chemokine based on this motif clue.
screen from which a small  molecule       
drug emanates.                             2.  A focused  program  based on an
                                           independently developed sequence is
3.  Use of a  clone  or  cell  line        underway. Query of the HGS database
provided by HGS which  subsequently        for  tissue  distribution  does not
turns out to be more than 5% of the        influence   the   conduct   of  the
Product.                                   program.
                                          
4.  A receptor antagonist screen is        3.  A serotonin receptor antagonist
established.  Using only a negative        screen is established and a product
screen  which was an HGS screen and        that was active in a non-HGS  assay
a positive  screen which was not an        is  developed.  The  screen  used a
HGS  screen  (e.g.,  only a  binary        battery  of  two or  more  negative
screen).                                   serotonin  screens  at least one of
                                           which was an HGS screen and one was
                                           not an HGS screen.
                                          
                                           4.  Query   of  the  HGS   database
                                           versus  an  independently  invented
                                           EST. The sequence is present but no
                                           useful  abundance   information  or
                                           additional  sequence   information.
                                           The   research   program   is   not
                                           modified due to the query.
<PAGE>



Appendix E

Material Uses:                             Immaterial Uses:

                                           5.  Comparison on an  independently
                                           derived  bacterial  sequence to the
                                           human sequence contained in the HGS
                                           database. A bacterial sequence that
                                           did not have a close  match with an
                                           HGS   sequence   was   used  as  an
                                           antibacterial target.

                                           6.  Using  motif searching tools of
                                           HGS bioinformatics against a public
                                           domain database, a functional motif
                                           is found to be  present in a unique
                                           class  of  chemokines.  Using  this
                                           identification  handle derived from
                                           HGS   bioinformatics,    a   unique
                                           molecule  from  the  public  domain
                                           database is identified.

                                           7.  Query   of  the  HGS   database
                                           identifies  a  sequence   partially
                                           encoding  a new  receptor  (greater
                                           than   50%  of  the   cDNA   coding
                                           sequence  is  available  in the HGS
                                           database).  SP  identifies  greater
                                           than   50%  of  the   cDNA   coding
                                           sequence  for  the   protein.   SP,
                                           through   subsequent    independent
                                           research,  not  involving  LICENSED
                                           TECHNOLOGY,   identifies  a  kinase
                                           involved  in  signal   transduction
                                           from  this  receptor.  This  kinase
                                           then  becomes  a  target  for  drug
                                           discovery  and a  DRUG  PRODUCT  is
                                           subsequently  discovered using this
                                           kinase  screen.  For  avoidance  of
                                           doubt,   similar   discovery  of  a
                                           ligand   of   such   receptor   (as
                                           differentiated from discovery of an
                                           intracellular  signal  transduction
                                           messenger,  e.g.  the  kinase)  and
                                           subsequent  use of such ligand as a
                                           TARGET,    is   not   prima   facie
                                           immaterial    use    of    LICENSED
                                           TECHNOLOGY or SP TECHNOLOGY.

                                           8.  Negative          hybridization
                                           experiments  against HGS  sequences
                                           (e.g., gridding).
<PAGE>



Appendix E

Material Uses:                             Immaterial Uses:

                                           9.  Query   of  the  HGS   database
                                           identifies  50% or more of the cDNA
                                           coding  sequence of a new receptor.
                                           SP, through subsequent  independent
                                           research,    not    involving   HGS
                                           database  searches on the receptor,
                                           identifies  a  kinase  involved  in
                                           signal   transduction   from   this
                                           receptor.  Without  the  use of the
                                           HGS  database,  this kinase is then
                                           used   to    identify   a   further
                                           downstream messenger. A drug screen
                                           using this last messenger result in
                                           a Drug Product.







<PAGE>



                                   Appendix F

                                    SOFTWARE

Specifications for Informative System ("HGS TECHNOLOGY") to be installed at SP
--------------------------------------------------------------------------------

I.       Database and analysis server supplied by SP:
                                                 
         1.       Multi-processor Unix Host (DEC Alpha server or equivalent)

         2.       Unix system software

                  2.1      Sybase SQL Server
                  2.2      Sybase Open Client Libraries
                  2.3      Sybase Replication Server
                  2.4      C compiler
                  2.5      TCP/IP networking services
                  2.6      Electronic mail facilities
                  2.7      Backup/recovery equipment and software
                  2.8      Netscape Communications Server

II.      Macintosh client machines supplied by SP

         1.       Quadra and PowerMac models
         2.       Minimum 16MB of RAM
         3.       Minimum  14-inch color monitor; 17-inch recommended for active
                  users
         4.       50MB of available disk space
         5.       TCP/IP network connection
         6.       Netscape Navigator (V2.0)

III.     Network connectivity supplied SP

         1.       Installation  and  maintenance  of dedicated circuit (at lease
                  56Kbps)
         2.       Encryption equipment
         3.       CSU/DSU line terminating equipment
         4.       Network router interface

IV.      Macintosh client software supplied by HGS:

         1.       IRIS bioinformatics application
         2.       HGS BLAST Client
         3.       PSEM (Protein structure evaluation module)




<PAGE>



                                   Appendix F


V.       Server software supplied by HGS:

         1.       Components derived from the public domain are indicated:  HGS
will install and configure the  public  domain  software, but  cannot  provide a
warranty for its performance.

         2.       Database schema, stored procedures, triggers:

                  a)       Unix command client
                  b)       Data management utilities
                  c)       BLAST sequence searching software (public domain)
                  d)       FASTA sequence searching software (public domain)
                  e)       BLOCKS motif searching software (public domain)

VI.      Services provided by HGS:

         1.       Setup SP database schema
         2.       Testing of network and system components on SP equipment
         3.       Development of on-going data transfer mechanism
         4.       Training for end users of the Iris application
         5.       Training  for  technical  people  in system administration and
                  troubleshooting
         6.       Assistance developing customer analyses and reports
         7.       Telephone  and  e-mail  support  for  the database and related
                  applications

    Definition of requirement to achieve operational status of SOFTWARE at SP
    -------------------------------------------------------------------------

This list  identifies the software and services to be provided to SP by HGS that
will enable users of the SOFTWARE at SP to evaluate the LICENSED TECHNOLOGY.

Operational  status of the SOFTWARE at SP shall be considered  established  upon
delivery  of such  software  and  services to SP and the Iris  software  running
successfully at SP facilities.

Services to be available to SP users from Macintosh workstations:

         1.       Sign on with user identification and  password  authentication

         2.       Retrieve  sequences  by  identification  code,  gene  name and
                  library

         3.       Export  sequences  in  popular  formats  for sequence analysis
                  programs.

         4.       Retrieve library information and sequencing statistics

         5.       Retrieve sequence assemblies; display assembly alignments


<PAGE>
                                   Appendix F


         6.       Customize tabular displays

         7.       Customize user dashboard

         8.       Prepare and save custom queries

         9.       Perform interactive BLAST searches

         10.      Perform  Genbank  and  Medline  lookups  using  the HGS Entrez
                  client

         11.      Perform interactive sequence assemblies

         12.      Perform simple modeling of putative proteins

         13.      Identify library distribution of related sequences

         14.      Perform library expression analyses

In addition to the  establishment of the  above-listed  features and operational
capabilities of the SOFTWARE, HGS will complete an initial user training session
of SP users and will  provide  the  following  additional  services  to  achieve
operational status of the SOFTWARE:

Services provided to SP Information Management staff:

         1.       Assist SP in installing dedicated, encrypted data circuit

         2.       Configure and test the database

         3.       Develop data transfer mechanism

         4.       Customize  sequence  classification  methods  for  analysis of
                  Human ESTs

         5.       Train technical staff on system administration functions:

                  a.       Configure Macintosh workstations
                  b.       Setting up new users, modifying users parameters
                  c.       Configuring local BLAST databases
                  d.       Understanding the database schema
                  e.       Understanding how data is processed and interpreted
                  f.       Troubleshooting problems
                  g.       Monitoring the HGS/SP data connection
                  h.       Developing custom queries and reports


<PAGE>




                                   Appendix G

--------------------------------------------------------------------------------
SUBJECT:  __________________________         SECTION:

     CURRENT BOOKKEEPING EXCHANGE RATES          ADMINISTRATIVE AND GENERAL
--------------------------------------------------------------------------------
                                     PURPOSE
                                     -------

To provide general guidelines for the establishment and communication of current
bookkeeping exchange rates by Corporate Treasury to divisions and subsidiaries.

                                   APPLICATION
                                   -----------

Applies to Schering-Plough Corporation, its divisions and all subsidiaries.

                                     POLICY
                                     ------

Establishment of Rates              The current bookkeeping  exchange rates will
                                    be  determined   monthly  by  S-P  Corporate
                                    Treasury. The rates will be based on:

                                    o       The market rates for selling foreign
                                            currencies   in  New   York  on  the
                                            morning  of the 25th of each  month;
                                            the 31st in December or

                                    o       In  thinly  traded   currencies  the
                                            local  rate   established   in  that
                                            country for buying U.S. dollars

                                    If the 25th occurs on a holiday, Saturday or
                                    Sunday, the rates used are those of the last
                                    business  day prior to the 25th.  If for any
                                    reason a rate  established is  significantly
                                    different from the rate prevailing  locally,
                                    the   Chief   Financial   Officer   of   the
                                    subsidiary  should  promptly telex Corporate
                                    Treasury.

Notification                        Rates will be  communicated  to subsidiaries
                                    on the last day of each accounting period by
                                    Corporate  Treasury  (1st workday of ensuing
                                    year at year-end).  The  communication  will
                                    advise each subsidiary of all Corporate wide
                                    current rates,  regardless of whether or not
                                    they have changed from the prior  accounting
                                    period.

                                    As  there  is no  January  closing,  January
                                    rates will not be issued and December  rates
                                    will  remain  in effect  until the  February
                                    month-end closing.

Recordkeeping of Rates              At the  beginning  of each year, a worksheet
                                    similar to the example on page 4 (Exhibit A)
                                    will  be  sent   to  all   subsidiaries   by
                                    Corporate  Treasury.  Each  subsidiary  will
                                    maintain  a monthly  record of all  exchange
                                    rates  throughout the Corporate system which
                                    may affect its accounting  transactions  and
                                    reporting.


<PAGE>



                                   Appendix G

--------------------------------------------------------------------------------
SUBJECT:  __________________________         SECTION:

     CURRENT BOOKKEEPING EXCHANGE RATES          ADMINISTRATIVE AND GENERAL
--------------------------------------------------------------------------------
                               POLICY (Continued)
                               ------

Recordkeeping  of Rates             The  worksheet  lists all countries in which
 (cont'd)                           subsidiaries  are  located   and   for  each
                                    country gives:

                                    1.  The  cable  code  (based  on  a  country
                                        abbreviation)  so  as  to  identify  the
                                        country  for which  there is a change in
                                        exchange rate

                                    2.  The average annual exchange rate used in
                                        the Operating  Plan for the current year
                                        and

                                    3.  The exchange rate  established as of the
                                        end of the previous year. Twelve columns
                                        are  provided  for  the   subsidiary  to
                                        record  changes in  exchange  rates from
                                        the communication received each month.

Quoting of Rates                    To   conform   with   practices    generally
                                    prevailing in each country, and to avoid any
                                    confusion, all exchange rates will be quoted
                                    in terms of the number of  foreign  currency
                                    units per U.S.  dollar.  This means that for
                                    those foreign currency units that are valued
                                    at more than one U.S.  dollar,  the exchange
                                    rates are quoted as a decimal of the foreign
                                    currency unit.

                                    For example, the pound sterling plan rate is
                                    quoted as (pound).625 per U.S. dollar rather
                                    than U.S. $1.60 per pound sterling.

                                    Exchange  rates  are  generally   quoted  as
                                    follows:

                                    o   In three  decimals for  currencies  with
                                        less  than  one  unit  per  U.S.  dollar
                                        (e.g., U.K. .625)

                                    o   In two  decimals  for those  with one or
                                        more but  less  than  ten  units  (e.g.,
                                        France 6.60)

                                    o   In one  decimal  for  those  with ten or
                                        more but  less  than  100  units  (e.g.,
                                        Austria 13.5) and

                                    o   With no  decimals  for those with 100 or
                                        more units (e.g., Italy 1450)

                                    Rates  will be  quoted  in more  than  three
                                    digits  only when  necessary  to  conform to
                                    rates required for official purposes locally
                                    or when  the  exchange  rate  exceeds  1,000
                                    (e.g.,  Italy  1450).  If the  rate  exceeds
                                    1,000,   it  should  be   rounded  to  three
                                    significant digits (e.g., rate of 4633 would
                                    be shown as 4630).
<PAGE>



                                   Appendix G

--------------------------------------------------------------------------------
SUBJECT:  __________________________         SECTION:

     CURRENT BOOKKEEPING EXCHANGE RATES          ADMINISTRATIVE AND GENERAL
--------------------------------------------------------------------------------

                                 RESPONSIBILITY
                                 --------------

The Corporate Treasury Department will:

         A.       Distribute the Current Bookkeeping  Exchange Rate Worksheet at
                  the beginning of each year to all divisions and subsidiaries.

         B.       Establish and  communicate  the Current  Bookkeeping  Exchange
                  rate as stated in the above policy.

The chief financial  officer of each subsidiary will maintain monthly records of
communicated exchange rates.




<PAGE>


                                   Appendix H

Exhibit H:                Biological Data Generated at SB by Use of Materials
                              Transferred from HGS


Material Transferred from HGS to SB:             [Material_type]


Project ID:                                      [PID]


Gene Match of Interest:                          [Tentative]


SEQUENCE INFORMATION

DNA sequence:
  [DNA_seq]


Translated protein  sequence:
  [Prot_seq]


TISSUE DISTRIBUTION:
  [Tissue_dist]


FUNCTIONAL STUDIES/BIOLOGICAL CHARACTERIZATION
  [Function]