LEXICON GENETICS INC/TX
8-K, EX-10.1, 2000-10-10
COMMERCIAL PHYSICAL & BIOLOGICAL RESEARCH
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                                                                    EXHIBIT 10.1

CONFIDENTIAL MATERIALS OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND
EXCHANGE COMMISSION. ASTERISKS DENOTE OMISSIONS.















               LEXVISION(TM) DATABASE AND COLLABORATION AGREEMENT


                                     BETWEEN


                          LEXICON GENETICS INCORPORATED


                                       AND


                          BRISTOL-MYERS SQUIBB COMPANY


                         DATED AS OF SEPTEMBER 26, 2000
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               LEXVISION(TM) DATABASE AND COLLABORATION AGREEMENT

         THIS LEXVISION(TM) DATABASE AND COLLABORATION AGREEMENT (this
"Agreement") is dated as of September 26, 2000 (the "Effective Date") and is
made by and between LEXICON GENETICS INCORPORATED, a Delaware corporation
("Lexicon"), and BRISTOL-MYERS SQUIBB COMPANY, a Delaware corporation ("BMS").
Lexicon and BMS are sometimes referred to herein individually as a "party" and
collectively as the "parties".

                                 R E C I T A L S

         WHEREAS, Lexicon has compiled and is continuing to compile the
LexVision(TM) and OmniBank(R) Databases (as hereinafter defined);

         WHEREAS, Lexicon owns or has rights to, and expertise in, certain
methods of producing Mutant Mice (as hereinafter defined);

         WHEREAS, BMS desires to obtain non-exclusive access to the LexVision
and OmniBank Databases during the Collaboration Term (as hereinafter defined)
for purposes of drug discovery research;

         WHEREAS, BMS desires that Lexicon develop, upon request, certain Mutant
Mice having Selected Mutations (as hereinafter defined) for use in such
research;

         WHEREAS, Lexicon is willing to grant BMS non-exclusive access to the
LexVision and OmniBank Databases during the Collaboration Term for purposes of
drug discovery research upon the terms and conditions set forth herein; and

         WHEREAS, Lexicon is willing to develop, upon request by BMS, Mutant
Mice having Selected Mutations for use in drug discovery research upon the terms
and conditions set forth herein;

         NOW THEREFORE, in consideration of the premises and of the covenants
herein contained, the parties hereto mutually agree as follows:


                             ARTICLE 1. DEFINITIONS

         For purposes of this Agreement, the terms defined in this Article 1
shall have the respective meanings specified below:

         1.1 "Academic Collaborator" means a principal investigator, employed at
a university or other not-for-profit academic research institution that has
entered into a Material Transfer Agreement with BMS pursuant to Section 3.5, who
is performing collaborative research with BMS involving use of a Mutant Mouse or
Progeny.

         1.2 "Access Fee" has the meaning set forth in Section 7.1.

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         1.3 "Affiliate" means any corporation, company, partnership, joint
venture and/or firm which controls, is controlled by or is under common control
with a party to this Agreement. For purposes hereof, "control" means (a) in the
case of corporate entities, direct or indirect ownership at least fifty percent
(50%) of the stock or shares entitled to vote for the election of directors; and
(b) in the case of non-corporate entities, direct or indirect ownership of at
least fifty percent (50%) of the equity interest with the power to direct the
management and policies of such non-corporate entities.

         1.4 "BASF" means BASF Bioresearch Corporation.

         1.5 "Biotherapeutic" means any human therapeutic and/or prophylactic
that consists of or incorporates [**].

         1.6 [**]

         1.7 "Collaboration Term" means the period described in Section 12.1.1.

         1.8 "Commercialization Field" means the treatment and prevention of
human diseases and disorders.

         1.9 "Confidential Information" means any information and data received
by a party (the "Receiving Party") from the other party or its Affiliates (the
"Disclosing Party") in connection with this Agreement (which, in the case of BMS
as the Receiving Party, shall include without limitation the LexVision and
OmniBank Databases and all information contained therein and all documentation
related thereto; and which, in the case of Lexicon as the Receiving Party, shall
include without limitation any partial or complete gene sequences BMS may
provide to Lexicon in connection with this Agreement, any information and data
relating to BMS's research and development efforts using the LexVision and
OmniBank Databases, a Mutant Mouse, Progeny or any human ortholog of a mouse
gene contained in the OmniBank Database and discovered by BMS, and any research,
testing, clinical, regulatory, marketing or other scientific or business
information, plans, or data pertaining to any Product of BMS). Notwithstanding
the foregoing, Confidential Information shall not include any part of such
information or data that:

                  (a) is or becomes part of the public domain other than by
         unauthorized acts of the Receiving Party, its Affiliates or Corporate
         Partners;

                  (b) can be shown by written documents to have been already in
         the possession of the Receiving Party or its Affiliates or its
         Corporate Partners prior to disclosure under this Agreement, provided
         such Confidential Information was not obtained directly or indirectly
         from the Disclosing Party pursuant to a confidentiality agreement;

                  (c) can be shown by written documents to have been disclosed
         to the Receiving Party or its Affiliates or Corporate Partners by a
         Third Party, provided such Confidential Information was not obtained
         directly or indirectly from the Disclosing Party pursuant to a
         confidentiality agreement;

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                  (d) can be shown by written documents to have been
         independently developed by the Receiving Party or its Affiliates or its
         Corporate Partners without use of, or access to, Confidential
         Information of the Disclosing Party; or

                  (e) is disclosed by the Receiving Party pursuant to
         interrogatories, requests for information or documents, subpoena, civil
         investigative demand issued by a court or governmental agency or as
         otherwise required by law; provided, however, that the Receiving Party
         notifies the Disclosing Party promptly upon receipt thereof, giving
         (where practicable) the Disclosing Party sufficient advance notice to
         permit it to oppose, limit or seek confidential treatment for such
         disclosure; and provided, further, that the Receiving Party furnishes
         only that portion of the Confidential Information which it is advised
         by counsel is legally required whether or not a protective order or
         other similar order is obtained by the Disclosing Party.

Specific Confidential Information of a Disclosing Party shall not be deemed to
come under the foregoing exceptions merely because it is embraced by more
general information that is or becomes part of the public domain, or is known
by, disclosed to or independently developed by the Receiving Party. For example,
coding sequence of a gene disclosed by a Disclosing Party shall not be deemed to
come under the foregoing exceptions merely because genomic DNA sequence
information relating to such gene is or becomes part of the public domain, or is
known by, disclosed to or independently developed by the Receiving Party, unless
that genomic DNA sequence information has been specifically and materially
established as exon region(s) via standard molecular biology laboratory
techniques.

         1.10 "Corporate Partner" means any Third Party, other than an Academic
Collaborator, which enters into an agreement with BMS or its Affiliates
involving the grant to such Third Party of rights for the development,
commercialization and/or marketing of a Product, and which, if BMS has
transferred a Mutant Mouse or Progeny to such Third Party, has entered into a
Material Transfer Agreement with BMS pursuant to Section 3.5.

         1.11 "Cre-Lox Mouse" means any mouse cell or mouse containing a
Selected Mutation and which (i) has one or more lox sites in its genome and (ii)
contains DNA capable of expressing a Cre recombinase protein, and which is made
or produced by Lexicon and delivered to BMS.

         1.12 "Cre-Lox Patent Rights" means the United States and foreign
patents and patent applications listed on Exhibit 1.11, any
continuation-in-part, continuation or divisional applications thereof, any
patent granted on any aforesaid patent application and any extension, revival,
re-examination or reissue of any of such patent, and any continuations,
continuations-in-part, divisionals, reissues, extensions or foreign counterparts
of any of the foregoing, which Lexicon has the right to sublicense hereunder.
The terms "Cre" and "lox" (also referred to as "loxP") have the meanings as
described and embodied by the Cre-Lox Patent Rights.

         1.13 "Cre-Lox Technology" means all the inventions described, embodied
by and claimed in the Cre-Lox Patent Rights.

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         1.14 "Cre Mouse" means any mouse cell or mouse (i) having no lox sites
in its genome and (ii) containing DNA capable of expressing a Cre recombinase
protein.

         1.15 "Disclosing Party" has the meaning set forth in Section 1.8
hereof.

         1.16 "DPC" means DuPont Pharmaceuticals Company.

         1.17 "Drug Target" means [**].

         1.18 "Effective Date" means the date specified in the initial paragraph
of this Agreement.

         1.19 "Event of Default" means an event described in Section 12.3
hereof.

         1.20 "First Commercial Sale" means the first sale for use or
consumption by the general public of a Product in a country after all required
marketing and pricing or pricing reimbursement approvals to be granted by the
governing health authority of such country have been obtained. For the avoidance
of doubt, First Commercial Sale shall not include the sale of any Product for
use in clinical trials or for compassionate use prior to the approval of an NDA.

         1.21 "Homologous Recombination" means a method of making a Mutant Mouse
containing a Selected Mutation in a particular portion of a gene using the
standard homologous recombination techniques.

         1.22 "Humanized Mutant Mouse" means a mouse cell or mouse containing a
Selected Mutation (i) that may or may not have lox sites in its genome and (ii)
that contains DNA of a human gene replacing DNA from the homologous mouse gene,
and which is made or produced by Lexicon and delivered to BMS.

         1.23 "IND" means an Investigational New Drug application filed with the
U.S. Food and Drug Administration or a similar application for the clinical
testing of a Product in human subjects filed with a foreign regulatory
authority.

         1.24 "Invention" means any new and useful composition of matter,
process, product by process, machine or manufacture, including without
limitation, software or an arrangement or collection of data, or any new and
useful improvement thereof, whether or not patentable, which has been or is
discovered, conceived, developed or first reduced to practice by employees or
others acting on behalf of Lexicon or its Affiliates (either solely or jointly
with others), or by employees or others acting on behalf of BMS or its
Affiliates (either solely or jointly with others), through [**].

         1.25 "Joint Invention" means any new and useful composition of matter,
process, product by process, machine or manufacture, including without
limitation, software or an arrangement or collection of data, or any new and
useful improvement thereof, whether or not patentable, hereafter discovered,
conceived, made, developed or reduced to practice jointly by employees or others
acting on behalf of BMS or its Affiliates, together with employees or others
acting on behalf of Lexicon or its Affiliates, through [**].

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         1.26 "Joint Patent Rights" means (i) any United States and foreign
patent applications, including without limitation provisional patent
applications, hereafter owned, in whole or in part, by Lexicon or BMS or having
legal force in any country, which claim a Joint Invention, (ii) any United
States patents and foreign patents issuing from such patent applications and
(iii) any substitutions, renewals, continuations, continuations-in-part,
divisionals, reissues, reexaminations or extensions of any of the foregoing.

         1.27 "Lexicon Patent Rights" means (i) the United States and foreign
patents owned by or licensed (with rights to sublicense) to Lexicon which claim
a composition, method, or process relating to the Lexicon Technology, (ii) the
United States and foreign patent applications, including without limitation
provisional patent applications, heretofore or hereafter filed by Lexicon or
having legal force in any country, which claim a composition, method, or process
relating to the Lexicon Technology, (iii) any United States patents and foreign
patents issuing from such patent applications and (iv) any substitutions,
renewals, continuations, continuations-in-part, divisionals, reissues,
reexaminations or extensions of any of the foregoing; provided that the Lexicon
Patent Rights exclude any Joint Patent Rights, the Cre-Lox Patent Rights and the
TET-System Patent Rights.

         1.28 "Lexicon Technology" means all inventions (including Inventions
other than Joint Inventions), discoveries, improvements, know-how, technical
information, data or other technology relating to [**], in each such case as
have been heretofore or are hereafter discovered, conceived, made, developed
and/or reduced to practice solely or jointly by employees or others acting on
behalf of Lexicon or its Affiliates, or owned in whole or in part by or licensed
(with the right to sublicense) to Lexicon, but excluding the Cre-Lox Technology
and the TET-System Technology.

         1.29 "LexVision Database" means Lexicon's proprietary database
comprising phenotypic data and associated information, as more fully described
in Exhibit 1.29 hereto, and as may be supplemented from time to time as set
forth herein.

         1.30 "Lox Mutant Mouse" means a mouse cell or mouse containing a
Selected Mutation (i) having one or more lox sites in its genome and (ii) not
containing DNA capable of expressing a Cre recombinase protein, and which is
made or produced by Lexicon using either the OmniBank Method or Homologous
Recombination and delivered to BMS.

         1.31 "Major Market" means the United States, the European Union (under
the centralized process or any other process), Germany, the United Kingdom,
France, Italy, Spain or Japan.

         1.32 "Mutant Mouse" means collectively a Cre Mouse, a Cre-Lox Mouse, a
Lox Mutant Mouse, a Humanized Mutant Mouse or a Non-Cre-Lox Mutant Mouse having
a Selected Mutation that was made or produced by Lexicon and delivered to BMS
pursuant to Section 5.2. A "line of Mutant Mice" means Mutant Mice having the
same Selected Mutation.

         1.33 "NDA" means a New Drug Application filed with the U.S. Food and
Drug Administration or a similar application for marketing approval of a Product
filed with a foreign regulatory authority.

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         1.34 "Net Sales" means, with respect to a Royalty-Bearing Product, the
gross amount invoiced by BMS, its Affiliates or Corporate Partners for sales of
such Royalty-Bearing Product to a Third Party, less:

                  (a) trade, quantity and cash discounts actually allowed;

                  (b) discounts, refunds, rebates, chargebacks, retroactive
         price adjustments, billing errors and any other allowances (including,
         without limitation, government-mandated and managed health
         care-negotiated rebates) actually granted which effectively reduce the
         net selling price;

                  (c) product returns credits and allowances actually granted;

                  (d) any tax imposed on the production, sale, delivery or use
         of the product (excluding federal, state or local taxes based on
         income);

                  (e) freight, postage, shipping, customs duties, excises,
         tariffs, surcharges, other governmental charges (excluding federal,
         state or local taxes based on income) and insurance charges actually
         allowed or paid for delivery of Products;

                  (f) payments or rebates paid with respect to such Product in
         connection with state or federal Medicare, Medicaid or similar programs
         in the United States or in connection with similar programs in other
         countries in which there are sales; and

                  (g) adjustments for bad debts.

Such amounts shall be determined from the books and records of BMS, its
Affiliates or Corporate Partners, as the case may be, maintained in accordance
with the generally accepted accounting principles, consistently applied.

         In the event the Royalty-Bearing Product is sold as part of a
Combination Product (as defined below), the Net Sales from the Combination
Product, for the purposes of determining royalty payments, will be determined by
multiplying the Net Sales of the Combination Product by the fraction, A/A+B
where A is the average sale price of the Royalty-Bearing Product when sold
separately in finished form and B is the average sale price of the other active
compounds or ingredients in the Combination Product sold separately in finished
form.

         In the event that the average sale price of the Royalty-Bearing Product
can be determined but the average sale price of the other active compounds or
ingredients cannot be determined, Net Sales for purposes of determining royalty
payments will be calculated by multiplying the Net Sales of the Combination
Product by the fraction C/C+D where C is the selling party's average sales price
of the Royalty-Bearing Product and D is the difference between the average
selling price of the Combination Product and the average selling price of the
Royalty-Bearing Product. If the average sale price of the other active compounds
or ingredients can be determined but the average price of the Royalty-Bearing
Product cannot be determined, Net Sales for purposes of determining royalty
payments will be calculated by multiplying the Net Sales of the Combination
Product by the following formula: one minus C/C+D where C is the average selling

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price of the other product(s) and D is the difference between the average
selling price of the Combination Product and the average selling price of the
other active compounds or ingredients.

         In the event that the average sales price of both the Royalty-Bearing
Product and the other active compounds or ingredients in the Combination Product
cannot be determined, the Net Sales of the Royalty-Bearing Product shall be
negotiated in good faith by the parties.

         The Net Sales price for a Combination Product in a given country will
be calculated once each calendar year and such price will be used during all
applicable royalty reporting periods for the entire calendar year for such
country, absent extraordinary conditions or events. When determining the average
sale price of a Royalty-Bearing Product or the other active compounds or
ingredients in the Combination Product, the average sale price will be
calculated using data arising from the 12 months preceding the calculation of
the Net Sales price for the Combination Product. As used above, the term
"Combination Product" means any Royalty-Bearing Product sold in conjunction with
any other active component(s) (whether packaged together or in the same
therapeutic formulation).

         If BMS or any of its Affiliates or Corporate Partners sells any
Royalty-Bearing Product to a Third Party which also purchases other products or
services from such seller or any of its Affiliates in a bundled, combination or
capitated transaction (a "Bundled Transaction"), and such seller discounts the
sales price of the Royalty-Bearing Product to a greater degree than such seller
or its Affiliates generally discount the price of its other products to such
customer, then the aggregate amount received with respect to such Bundled
Transaction shall be allocated to Net Sales pursuant to the formula set forth in
Exhibit 1.34 hereto. For purposes of the foregoing, "discounting" includes
establishing the list price at lower than the seller's normal pricing level.

         Free samples of Royalty-Bearing Product and the disposition of
Royalty-Bearing Product for, or the use of Royalty-Bearing Product in,
pre-clinical or clinical (Phase 1 - 3) trials or other market-focused (Phase 4)
trials in which Royalty-Bearing Product is provided to patients without any
payment shall not result in any Net Sales.

         1.35 "Non-Cre-Lox Mutant Mouse" means a mouse cell or mouse containing
a Selected Mutation (i) having no lox sites in its genome and (ii) not
containing DNA capable of expressing a Cre recombinase protein, and which is
made or produced by Lexicon using either the OmniBank Method or Homologous
Recombination and delivered to BMS.

         1.36 "OmniBank Database" means Lexicon's proprietary database
comprising OmniBank Sequence Tags and all associated information, as more fully
described in Exhibit 1.36 hereto, and as may be supplemented from time to time
as set forth herein.

         1.37 "OmniBank" or "OmniBank Library" means Lexicon's proprietary
library of embryonic stem cell clones containing gene trap events in particular
mouse genes, which genes are identified by OmniBank Sequence Tags, and which
clones may or may not have lox sites, as more fully described in Exhibit 1.36
hereto.

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         1.38 "OmniBank Method" means the method of making or developing a mouse
containing a Selected Mutation using gene trap insertion techniques with
embryonic stem cells retrieved from the OmniBank Library.

         1.39 "OmniBank Sequence Tag" or "OST" means any DNA sequence that is
derived from a mouse gene using gene trap insertion techniques and contained in
the OmniBank Database.

         1.40 "Performance Year" has the meaning specified in Section 4.2
hereof.

         1.41 "Phase 3 Trial" means a pivotal human clinical trial in any
country the results of which could be used to establish safety and efficacy of a
Product as a basis for an NDA or that would otherwise satisfy the requirements
of 21 CFR 312.21(c) or its foreign equivalent. For purposes of this Agreement,
"commencement of a Phase 3 Trial" for a Product shall mean the introduction of
such Product into a human patient in a Phase 3 Trial.

         1.42 "Product" means any small molecule drug which [**], or which [**],
through use by BMS, its Affiliates, Academic Collaborators or Corporate Partners
of [**]; provided, however, that a Product shall not include any product, the
manufacture, use, sale or importation of which would infringe a Valid Claim of
the Cre-Lox Patent Rights.

         1.43 "Product Patent Rights" means (i) the United States and foreign
patent applications, hereafter filed by BMS, its Affiliates, Academic
Collaborators or Corporate Partners or having legal force in any country, which
claim a composition, method, or process relating to a Product, (ii) any United
States patents and foreign patents issuing from such patent applications and
(iii) any substitutions, renewals, continuations, continuations-in-part,
divisionals, reissues, reexaminations or extensions of any of the foregoing.

         1.44 "Progeny" means mice, including successive generations thereof,
that are produced or developed by BMS, its Affiliates, Academic Collaborators or
Corporate Partners by breeding a Mutant Mouse with any other mouse (including,
without limitation, any other Mutant Mouse); provided that Progeny shall not
include any mouse that does not contain at least one copy of an allele carrying
a Selected Mutation, or nucleotide sequence derived or descended from an
OmniBank vector, stably integrated into its genome.

         1.45 "Project Coordinator" has the meaning specified in Section 2.1
hereof.

         1.46 "Receiving Party" has the meaning set forth in Section 1.8 hereof.

         1.47 "Research Field" means use by BMS, its Affiliates, Academic
Collaborators and/or Corporate Partners, at the internal research facilities of
BMS, its Affiliates, Academic Collaborators and Corporate Partners, for research
directed toward the discovery, identification, selection, or characterization of
Products. The Research Field shall specifically exclude the development,
manufacture, use, lease, sale (or other transfer for consideration) or
importation of any product for sale (or lease or other transfer of a product for
consideration) wherein the manufacture, use, sale or importation of such product
would infringe a Valid Claim of the Cre-Lox Patent Rights, including but not
limited to wherein the product is manufactured using a composition or method
which would infringe a Valid Claim of the Cre-Lox Patent Rights.

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         1.48 "Royalty-Bearing Product" means any Product that [**]; provided
that, [**]. Without prejudice to any other provisions of this Agreement, Lexicon
shall, through the Steering Committee, regularly update BMS regarding [**].

         1.49 "Selected Mutation" means a specific mutation in a particular
portion of a gene of a mouse embryonic stem cell that is created using the
OmniBank Method or Homologous Recombination, which may or may not contain lox
sites.

         1.50 "Seek-Target-Validation Project" or "S-T-V Project" means
Lexicon's conduct of a Level 1, 2 or 3 S-T-V analysis pursuant to Section 6.1 or
6.2, as the case may be. A S-T-V Project may involve Level 1 analysis which
includes, as applicable, the tests and assays described in Exhibit 1.50-A, or
Level 2 or Level 3 analysis which may further include, as applicable, the tests
and assays described in Exhibit 1.50-B.

         1.51 "Steering Committee" has the meaning specified in Section 2.1
hereof.

         1.52 "Territory" means all countries and jurisdictions throughout the
world.

         1.53 "TET-System Patent Rights" means the patents and patent
applications listed on Exhibit 1.53, including any division, continuation,
continuation-in-part, substitute, renewal, reissue, extension, confirmation,
reexamination, registration or foreign counterpart thereof.

         1.54 "TET-System Technology" means the tetracycline (or tetracycline
analog) regulated gene expression technology, including both the overall system
and any of its individual components, as claimed in the TET-System Patent
Rights.

         1.55 "Third Party" means any person or entity other than Lexicon or BMS
and their respective Affiliates.

         1.56 "Valid Claim" means either (i) a claim of an issued and unexpired
patent which has not been held permanently revoked, unenforceable or invalid by
a decision of a court or other governmental agency of competent jurisdiction,
unappealable or unappealed within the time allowed for appeal and that is not
admitted to be invalid or unenforceable through reissue, disclaimer or
otherwise, or (ii) a claim of a pending patent application that [**] and that
has not been abandoned or finally rejected without the possibility of appeal or
refiling.


                          ARTICLE 2. STEERING COMMITTEE

         2.1 Members of Steering Committee; Project Coordinators. The parties
shall establish a steering committee (the "Steering Committee"), which shall
comprise three representatives designated by each party (or such other number as
the parties may agree). The initial members of the Steering Committee are set
forth on Exhibit 2.1. Members of the Steering Committee may be represented at
any meeting by a designee who is appointed by such member for such meeting and
who has authority to act on behalf of such member. The chairperson of the
Steering Committee shall be designated annually on an alternating basis between
the parties. The initial chairperson shall be selected by BMS and is designated
on Exhibit 2.1. The party not

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designating the chairperson shall designate one of its representative members as
secretary to the Steering Committee for such year. Each party shall designate an
individual (a "Project Coordinator"), who may, but need not, be a member of the
Steering Committee to coordinate, on its behalf, the day-to-day interaction of
and communication between the parties under this Agreement. Each Project
Coordinator shall possess the education, training and experience necessary to
make him or her reasonably technically qualified to serve as a Project
Coordinator. The initial Project Coordinators are set forth on Exhibit 2.1. Each
party shall be free to replace its representative members of the Steering
Committee and its Project Coordinator with new appointees who have authority to
act on behalf of such party, on notice to the other party.

        2.2 Responsibilities of Steering Committee. The Steering Committee shall
be responsible for overseeing and directing the parties' interaction and
performance of their respective obligations under this Agreement. Without
limiting the generality of the foregoing, its duties shall include:

                  (a) evaluating and modifying, from time to time, the tests and
         analytical methods to be used in Level 1 S-T-V analyses;

                  (b) evaluating and modifying, from time to time, the tests and
         analytical methods to be used in Level 2 and 3 S-T-V Projects conducted
         by Lexicon under this Agreement;

                  (c) determining whether various Third Party licensees of the
         Lexicon Technology constitute Reciprocal Rightsgivers for the purpose
         of Section 3.4 (which determination will be made promptly following
         Lexicon's submission of the final terms relevant to such determination
         pursuant to Section 3.4.5);

                  (d) prioritizing and setting goals for the updates to the
         LexVision and OmniBank Databases that Lexicon is required to make from
         time to time;

                  (e) establishing criteria for inclusion of data from Lexicon's
         Level 1 analyses in the LexVision Database;

                  (f) reviewing the results of Lexicon's Level 1 analyses from
         time to time in order to determine compliance with such criteria;

                  (g) coordinating BMS's designation of genes for inclusion in
         the LexVision Database pursuant to Section 4.4;

                  (h) prioritizing and reviewing Lexicon's efforts to develop
         and supply Mutant Mice pursuant to Article 5;

                  (i) establishing criteria and strategies for seeking patent
         protection for Joint Inventions;

                  (j) providing for the exchange of information between the
         parties; and

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                  (k) addressing issues and resolving differences that may arise
         between the parties.

         2.3 Meetings of Steering Committee. The Steering Committee shall meet
at least once every calendar quarter, and more frequently as the parties deem
appropriate, on such dates and at such times as the parties shall agree, on ten
(10) days' written notice to the other party unless such notice is waived by the
parties. The first meeting of the Steering Committee shall take place within
thirty (30) days after the Effective Date, at Lexicon's facility in The
Woodlands, Texas. The Steering Committee may convene or be polled or consulted
from time to time by means of telecommunications, video conferences or
correspondence, as deemed necessary or appropriate by the parties. To the extent
that meetings are held in person, they shall alternate between the offices of
the parties unless the parties otherwise agree. The chairperson shall be
responsible for sending notices of meetings to all members.

         2.4      Decisions.

                  2.4.1 Quorum; Voting. A quorum for a meeting of the Steering
         Committee shall require the presence of at least one Lexicon member (or
         designee) and at least one BMS member (or designee) in person or by
         telephone. All decisions made or actions taken by the Steering
         Committee shall be made unanimously by its members, with the Lexicon
         members cumulatively having one vote and the BMS members cumulatively
         having one vote.

                  2.4.2 Dispute Resolution. In the event that unanimity cannot
         be reached by the Steering Committee with respect to a matter that is a
         subject of its decision-making authority, then the matter shall be
         referred for further review and resolution to the Senior Vice
         President, Early Development and Applied Technology at BMS, or such
         other similar position designated by BMS from time to time, and the
         Chief Executive Officer at Lexicon, or such other similar position
         designated by Lexicon from time to time. The designated officers of
         each party shall use reasonable efforts to resolve the matter within
         [**] after the matter is referred to them. If the designated officers
         cannot resolve any matter described in Section [**] within such [**]
         period, the matter shall be decided by the designated officer of BMS in
         good faith, taking into account the reasonable commercial interests of
         Lexicon and the express provisions of this Agreement (as identified in
         further detail below); and, if the designated officers cannot resolve
         any matter described in Section [**] within such [**] period, the
         matter shall be decided by the designated officer of Lexicon in good
         faith, taking into account the reasonable commercial interests of BMS
         and the express provisions of this Agreement. All other matters shall
         be resolved only by the parties achieving consensus, which they shall
         continue to use all reasonable effort to achieve until same has been
         achieved. In resolving any dispute under this Section 2.4.2, the
         parties shall consider, in good faith, Lexicon's and its Third Party
         licensees' and collaborators' commercial interests, including, without
         limitation, the need to maintain high throughput, cost effectiveness
         and the relevance of the matter in question to Lexicon's and such other
         persons' overall business activities.

                                       11
<PAGE>   13

         2.5 Minutes. Within fifteen (15) days after each Steering Committee
meeting, the secretary of the Steering Committee shall prepare and distribute
minutes of the meeting, which shall provide a description in reasonable detail
of the discussions had at the meeting and a list of any actions, decisions or
determinations approved by the Steering Committee. The secretary shall be
responsible for circulation of all draft and final minutes. Draft minutes shall
be first circulated to the chairperson, edited by the chairperson and then
circulated in final draft form to all members of the Steering Committee
sufficiently in advance of the next meeting to allow adequate review and comment
prior to the meeting. Minutes shall be approved or disapproved, and revised as
necessary, at the next meeting. Final minutes shall be distributed to the
members of the Steering Committee.

         2.6 Term. The Steering Committee shall exist until the termination or
expiration of the Collaboration Term and for such longer period as necessary to
perform the responsibilities assigned to it under this Agreement.

         2.7 Expenses. Each party shall be responsible for all travel and
related costs for its representatives to attend meetings of, and otherwise
participate on, the Steering Committee.


                           ARTICLE 3. GRANTS OF RIGHTS

         3.1 Grant of Rights and Licenses by Lexicon to BMS.

                  3.1.1 Non-Exclusive Grant of Access to LexVision and OmniBank
         Databases. Subject to the terms of this Agreement, Lexicon hereby
         grants to BMS and its Affiliates, during the Collaboration Term, the
         non-exclusive right under the Lexicon Technology of access, without the
         right to permit Third Parties any right of access, to the LexVision and
         OmniBank Databases for use in the Research Field only. BMS and its
         Affiliates may make copies of information contained in the LexVision
         and OmniBank Databases only to the extent reasonably necessary to
         exercise BMS's rights under this Agreement, and BMS agrees that all
         such copies will be treated as Confidential Information of Lexicon and
         further agrees to establish, and to cause its Affiliates to establish,
         reasonable security measures to prevent copies of the information
         contained in the LexVision and OmniBank Databases from being made
         available to Third Parties (except as provided in Section 3.5), all to
         the same extent required for the protection of Lexicon's other
         Confidential Information under Section 9.1.

                  3.1.2 Non-Exclusive Research License Grant under the Lexicon
         Technology to Mutant Mice and Progeny. Subject to the terms of this
         Agreement, and subject to Lexicon's pre-existing obligations pursuant
         to its agreement with the Merck Genome Research Institute, Lexicon
         hereby grants to BMS and its Affiliates within the Territory, a
         non-exclusive right and license under the Lexicon Technology to use,
         breed, cross-breed and have bred and cross-bred Mutant Mice and Progeny
         for use in the Research Field only. Except as provided in Sections
         3.1.5 and 3.5, BMS agrees to use the Mutant Mice and Progeny solely for
         Research Field purposes of BMS and its Affiliates in accordance with
         the terms and conditions of this Agreement, and not to use the Mutant

                                       12
<PAGE>   14

         Mice or Progeny for any purposes for Third Parties, or to transfer,
         license the use of or make available to Third Parties Mutant Mice or
         Progeny.

                  3.1.3 Non-Exclusive Research License Grant under the Cre-Lox
         Technology to Lox Mutant Mice, Cre-Lox Mice, Cre Mice and Progeny.

                           (a) Subject to the terms of this Agreement, Lexicon
                  hereby grants to BMS and its Affiliates the non-transferable
                  (except to Academic Collaborators and Corporate Partners as
                  provided in Section 3.1.3(b)), non-exclusive right under the
                  Cre-Lox Technology to use, breed and cross-breed Lox Mutant
                  Mice solely in the Research Field; provided however, that BMS
                  and its Affiliates shall not manipulate the genetic
                  information at any lox site of a Lox Mutant Mouse by using the
                  Cre-Lox Technology (including without limitation
                  cross-breeding a Lox Mutant Mouse with a Cre Mouse) or
                  otherwise further practice under the Cre-Lox Patents, except
                  as permitted under [**].

                           (b) BMS and its Affiliates shall not transfer any Lox
                  Mutant Mice or any Progeny or material in any way derived from
                  such Lox Mutant Mice to any Third Party, except as follows:
                  BMS may transfer Lox Mutant Mice (or any Progeny or material
                  in any way derived from such Lox Mutant Mice) to Academic
                  Collaborators and Corporate Partners, provided that each such
                  Academic Collaborator or Corporate Partner has first entered
                  into a Material Transfer Agreement with BMS substantially in
                  the form and containing the terms as set forth in Exhibit
                  3.5-B hereto.

                           (c) No right is granted to BMS or its Affiliates to
                  sell (or lease or otherwise transfer for consideration) or
                  develop or manufacture for sale (or lease or other transfer
                  for consideration) any product, the manufacture, use, sale or
                  importation of which would infringe a Valid Claim of the
                  Cre-Lox Patents, including but not limited to any product
                  which is manufactured using a composition or method which
                  would infringe a Valid Claim of the Cre-Lox Patents, but this
                  Section 3.1.3(c) shall be without prejudice to any rights
                  granted to BMS under [**].

                           (d) Subject to the restricted non-exclusive rights
                  granted to BMS, Lexicon (and its licensors, as applicable)
                  shall retain all rights under the Cre-Lox Technology to Lox
                  Mutant Mice (and any Progeny or material in any way derived
                  from such Lox Mutant Mice).

                  3.1.4 Non-Exclusive Research Rights under the TET-System
         Patent Rights to Mutant Mice Incorporating TET-System Technology. At
         such time as BMS orders any Mutant Mouse that incorporates TET-System
         Technology, BMS shall execute and deliver to BASF the Notice and
         Acknowledgment attached hereto as Exhibit 3.1.4 with respect thereto.
         BMS's rights under the TET-System Patent Rights and the TET-System
         Technology with respect to such Mutant Mice and Progeny shall be
         subject to the terms of such Notice and Acknowledgment or such other
         terms as may be set forth in a separate agreement between BASF and BMS.

                                       13
<PAGE>   15

                  3.1.5 Non-Exclusive Product Rights under the Lexicon
         Technology. Subject to the terms of this Agreement, Lexicon hereby
         grants to BMS and its Affiliates under the Lexicon Technology and
         within the Territory, during the term of this Agreement and thereafter,
         the non-exclusive (except as otherwise provided in Section 6.2) right
         and license to develop, have developed, manufacture, have manufactured,
         market, have marketed, sell and have sold Products in the
         Commercialization Field. Without limiting the generality of the
         foregoing, such right shall include the right for BMS, any of its
         Affiliates, and, subject to Section 3.5, any of its Academic
         Collaborators or Corporate Partners to further develop any information
         or data provided by Lexicon in connection with any S-T-V Project
         performed for BMS under this Agreement.

                  3.1.6 [**].

         3.2 Reservation of Rights. Notwithstanding the rights granted to BMS
under this Article 3, Lexicon at all times reserves (i) its rights to the
sequence information, including without limitation all information relating to
OSTs, contained in the OmniBank Database and partial sequences thereof; (ii) its
right to use and to permit others to use the LexVision or OmniBank Databases or
any OST, and to use and have used and to breed and have bred Mutant Mice and
successive generations thereof, to research, develop, have developed, use,
manufacture, have manufactured, sell and have sold products, including the right
to grant licenses with respect to any applicable intellectual property rights
for such purpose; and (iii) its rights to all embryonic stem cell clones and
other biological materials contained in the OmniBank Library.

         3.3 No Grant of Other Technology or Patent Rights. Except as otherwise
expressly provided in this Agreement, under no circumstances shall a party
hereto, as a result of this Agreement, obtain any ownership interest in or other
right to any technology, know-how, patents, patent applications, gene or genomic
sequence data or information, products, or biological materials of the other
party, including items owned, controlled or developed by, or licensed to, the
other party, or transferred by the other party to said party, at any time
pursuant to this Agreement.

         3.4 Grant of Non-Blocking Rights Among BMS, Lexicon and Reciprocal
Rightsgivers.

                  3.4.1 Rights to Use the LexVision Database, OmniBank Database
         and Mutant Mice.

                           3.4.1.1 BMS and its Affiliates shall not assert or
                  enforce, and shall use good faith efforts to obtain the
                  written agreement of its Academic Collaborators and Corporate
                  Partners not to assert or enforce, against Lexicon, its
                  Affiliates or any Reciprocal Rightsgiver (as defined below)
                  any claims of an issued patent arising from the use by BMS,
                  its Affiliates, Academic Collaborators or Corporate Partners
                  of the LexVision or OmniBank Databases or any information
                  therein, or arising from the use by BMS, its Affiliates,
                  Academic Collaborators or Corporate Partners of an OST, a
                  Mutant Mouse or Progeny, including, without limitation, any
                  claims of an issued patent to an Invention made

                                       14
<PAGE>   16

                  by BMS, its Affiliates, Academic Collaborators or Corporate
                  Partners, to the extent, but only to the extent, any such
                  assertion or enforcement would, absent a license from BMS,
                  prevent Lexicon, any of its Affiliates or any Reciprocal
                  Rightsgiver from using (and/or, in the case of Lexicon and its
                  Affiliates, permitting others to use), for research purposes
                  only (including, without limitation, research directed toward
                  the discovery, identification, selection, or characterization
                  of human therapeutic and diagnostic products), (i) the
                  LexVision or OmniBank Databases, any information therein or
                  any OST; (ii) any Mutant Mice or Progeny or other mice having
                  a Selected Mutation; or (iii) any embryonic stem cell clones
                  or other biological materials contained in the OmniBank
                  Library.

                           3.4.1.2 Lexicon and its Affiliates shall not assert
                  or enforce, and shall use good faith efforts to obtain the
                  written agreement of its academic collaborators and corporate
                  partners not to assert or enforce, against BMS or its
                  Affiliates any claims of an issued patent arising from the use
                  by Lexicon, its Affiliates, academic collaborators or
                  corporate partners of the LexVision or OmniBank Databases or
                  any information therein, or arising from the use by Lexicon,
                  its Affiliates, academic collaborators or corporate partners
                  of an OST, a Mutant Mouse or Progeny, including, without
                  limitation, any claims of an issued patent to an Invention
                  made by Lexicon, its Affiliates, academic collaborators or
                  corporate partners, to the extent, but only to the extent, any
                  such assertion or enforcement would, absent a license from
                  Lexicon, prevent BMS or any of its Affiliates from using, for
                  research purposes only (including, without limitation,
                  research directed toward the discovery, identification,
                  selection, or characterization of human therapeutic and
                  diagnostic products), (i) the LexVision or OmniBank Databases,
                  any information therein or any OST; (ii) any Mutant Mice or
                  Progeny or other mice having a Selected Mutation; or (iii) any
                  embryonic stem cell clones or other biological materials
                  contained in the OmniBank Library.

                  3.4.2 Rights Relating to Drug Targets and Products.

                           3.4.2.1 BMS and its Affiliates shall not assert or
                  enforce, and shall use good faith efforts to obtain the
                  written agreement of its Academic Collaborators and Corporate
                  Partners not to assert or enforce, against Lexicon or its
                  Affiliates any claims of an issued patent arising from the use
                  by BMS, its Affiliates, Academic Collaborators or Corporate
                  Partners of the LexVision or OmniBank Databases or any
                  information therein, or arising from the use by BMS, its
                  Affiliates, Academic Collaborators or Corporate Partners of an
                  OST, a Mutant Mouse or Progeny (or any claims of any other
                  issued patent owned or controlled by BMS or its Affiliates to
                  the composition of matter or use of the gene to which such
                  patent relates), including, without limitation, any claims of
                  an issued patent to an Invention made by BMS, its Affiliates,
                  Academic Collaborators or Corporate Partners, to the extent,
                  but only to the extent, any such assertion or enforcement
                  would, absent a license from BMS, prevent Lexicon or any of
                  its Affiliates (i) from using or permitting others to use, for
                  research purposes only (including, without limitation,
                  research directed toward the discovery, identification,
                  selection, or characterization of human therapeutic and
                  diagnostic

                                       15
<PAGE>   17

                  products), any Drug Target or (ii) developing, having
                  developed, manufacturing, having manufactured, marketing,
                  having marketed, selling and having sold human therapeutic and
                  diagnostic products discovered, identified, selected or
                  characterized in the course, or using the results, of such
                  research; provided that such rights granted to Lexicon and its
                  Affiliates hereunder shall not extend to the claims of any
                  patent (A) to the composition of matter of any small molecule
                  drug or any Biotherapeutic, or (B) to the use of any small
                  molecule drug or Biotherapeutic whose composition of matter is
                  specified in such patent, whether or not such composition of
                  matter is claimed therein. Lexicon may extend the rights
                  granted under this Section 3.4.2.1 to Third Parties (x) with
                  respect to the use of Drug Targets in fields other than the
                  discovery, identification, selection, or characterization of
                  small molecule drugs, and (y) with respect to the development,
                  manufacture, marketing and sale of human therapeutic and
                  diagnostic products, other than small molecule drugs, that are
                  discovered, identified, selected or characterized by Lexicon,
                  its Affiliates or such Third Parties.

                           3.4.2.2 BMS and its Affiliates shall not assert or
                  enforce, and shall use good faith efforts to obtain the
                  written agreement of its Academic Collaborators and Corporate
                  Partners not to assert or enforce, against any Reciprocal
                  Rightsgiver any claims of an issued patent arising from the
                  use by BMS, its Affiliates, Academic Collaborators or
                  Corporate Partners of the LexVision or OmniBank Databases or
                  any information therein, or arising from the use by BMS, its
                  Affiliates, Academic Collaborators or Corporate Partners of an
                  OST, a Mutant Mouse or Progeny (but expressly excluding any
                  claims of any other issued patent owned or controlled by BMS
                  or its Affiliates to the composition of matter or use of the
                  gene to which such patent relates), including, without
                  limitation, any claims of an issued patent to an Invention
                  made by BMS, its Affiliates, Academic Collaborators or
                  Corporate Partners, to the extent, but only to the extent, any
                  such assertion or enforcement would, absent a license from
                  BMS, prevent any Reciprocal Rightsgiver (i) from using, for
                  research purposes only (including, without limitation,
                  research directed toward the discovery, identification,
                  selection, or characterization of small molecule drugs), any
                  Drug Target to which such Reciprocal Rightsgiver holds a
                  license under the Lexicon Technology or (ii) developing,
                  having developed, manufacturing, having manufactured,
                  marketing, having marketed, selling and having sold small
                  molecule drugs discovered, identified, selected or
                  characterized in the course, or using the results, of such
                  research; provided that such rights granted to Reciprocal
                  Rightsgivers hereunder shall not extend to the claims of any
                  patent (A) to the composition of matter of any small molecule
                  drug or any Biotherapeutic, or (B) to the use of any small
                  molecule drug or Biotherapeutic whose composition of matter is
                  specified in such patent, whether or not such composition of
                  matter is claimed therein.

                           3.4.2.3 Lexicon and its Affiliates shall not assert
                  or enforce, and shall use good faith efforts to obtain the
                  written agreement of its academic collaborators and corporate
                  partners not to assert or enforce, against BMS or its
                  Affiliates any claims of an issued patent arising from the use
                  by Lexicon, its

                                       16
<PAGE>   18

                  Affiliates, academic collaborators or corporate partners of
                  the LexVision or OmniBank Databases or any information
                  therein, or arising from the use by Lexicon, its Affiliates,
                  academic collaborators or corporate partners of an OST, a
                  Mutant Mouse or Progeny, including, without limitation, any
                  claims of an issued patent to an Invention made by Lexicon,
                  its Affiliates, academic collaborators or corporate partners,
                  to the extent, but only to the extent, any such assertion or
                  enforcement would, absent a license from Lexicon, prevent BMS
                  or any of its Affiliates (i) from using, for research purposes
                  only (including, without limitation, research directed toward
                  the discovery, identification, selection, or characterization
                  of small molecule drugs), any Drug Target to which BMS holds a
                  license under the Lexicon Technology or (ii) developing,
                  having developed, manufacturing, having manufactured,
                  marketing, having marketed, selling and having sold small
                  molecule drugs discovered, identified, selected or
                  characterized in the course, or using the results, of such
                  research; provided that such rights granted to BMS hereunder
                  shall not extend to the claims of any patent (A) to the
                  composition of matter of any small molecule drug or any
                  Biotherapeutic, or (B) to the use of any small molecule drug
                  or Biotherapeutic whose composition of matter is specified in
                  such patent, whether or not such composition of matter is
                  claimed therein.

                  3.4.3 "Reciprocal Rightsgiver," for purposes of Section 3.4.1
         or 3.4.2, respectively, means a Third Party licensee under the Lexicon
         Technology which has agreed, in writing, to terms and conditions
         concerning the subject matter of such section that are at least as
         advantageous to BMS and Lexicon and their respective Affiliates
         (including, without limitation, with respect to assignment, as provided
         below) in the Research Field or with respect to Products in the
         Commercialization Field, respectively, as the terms and conditions
         under Section 3.4.1 or 3.4.2, as applicable, are to such Third Party;
         provided, however, that unless a Third Party licensee is already a
         Reciprocal Rightsgiver at the time the very first patent application
         covering the issued patent in question is published in any country or
         jurisdiction in the Territory, such Third Party licensee shall not have
         any rights under Section 3.4.2 with respect to such issued patent.
         Furthermore, except to the extent expressly provided herein, neither
         BMS nor Lexicon nor any Reciprocal Rightsgiver shall have the right to
         assign, transfer or otherwise dispose of (with or without
         consideration), in whole or in part, any of its rights under this
         Section 3.4 (or, in the case of BMS, under the equivalent provisions of
         Lexicon's agreements with Reciprocal Rightsgivers) except in connection
         with a merger, consolidation or sale with or to any unrelated Third
         Party of such portion of BMS's, Lexicon's or such Reciprocal
         Rightsgiver's assets that include such rights; that is to say, BMS's,
         Lexicon's or such Reciprocal Rightsgiver's rights under this Section
         3.4 (or, in the case of BMS, under the equivalent provisions of
         Lexicon's agreements with Reciprocal Rightsgivers) shall be assumed by
         such person's successor in interest in any such transaction and shall
         not be transferred separate from all or substantially all of its other
         business assets. Any purported assignment of rights under this Section
         3.4 in violation of the preceding sentence shall be void.

                  3.4.4 BMS, Lexicon and each Reciprocal Rightsgiver shall
         provide Lexicon's Project Coordinator with a copy of any patent
         application that such person reasonably

                                       17
<PAGE>   19

         believes will be implicated under this Section 3.4, promptly after such
         application is first published anywhere in the Territory. Lexicon's
         Project Coordinator shall distribute copies of such patent application
         to BMS, Lexicon and each Reciprocal Rightsgiver (other than the person
         which filed the application) and shall indicate the applicability of
         Section 3.4 thereto. The parties acknowledge and agree that initial
         determination of whether a patent application is implicated under this
         Section 3.4 may be difficult. Therefore, no person shall be held liable
         for failure to comply with this Section 3.4.4 (or under the equivalent
         provisions of Lexicon's agreements with Reciprocal Rightsgivers) with
         regard to any particular patent application, so long as such failure
         was reasonable and in good faith and is promptly rectified when
         realized.

                  3.4.5 Lexicon shall use good faith efforts to obtain from each
         Third Party that becomes a subscriber to the LexVision Database during
         the Collaboration Term agreements on the same terms as those set forth
         in this Section 3.4, so that such subscriber becomes a Reciprocal
         Rightsgiver. To the extent permitted, Lexicon shall periodically
         disclose to the Steering Committee, for action under Section 2.2(c),
         the identity of any such Reciprocal Rightsgivers and the terms and
         conditions agreed to by such Reciprocal Rightsgivers under which BMS
         receives rights reciprocal to those specified in this Section 3.4.

                  3.4.6 BMS and each Reciprocal Rightsgiver shall have the right
         to enforce the provisions of this Section 3.4 or the equivalent
         provisions of Lexicon's agreements with such Reciprocal Rightsgiver, as
         the case may be, as if each were a party to the agreements containing
         such provisions.

         3.5 Transfers to or Use for the Benefit of Corporate Partners and
Academic Collaborators. BMS and its Affiliates shall have the right to transfer
a Mutant Mouse or Progeny to a Corporate Partner or an Academic Collaborator,
provided that such Corporate Partner or Academic Collaborator shall have entered
into (i) a Material Transfer Agreement with BMS substantially in the form and
containing the terms as set forth in Exhibit 3.5-A or 3.5-B, whichever is
applicable, and (ii) any additional agreement required for such transfer under
[**]. Within [**] entering into any such Material Transfer Agreement, BMS shall
provide Lexicon with a copy thereof. [**].


              ARTICLE 4. ACCESS TO LEXVISION AND OMNIBANK DATABASES

         4.1 Access to the LexVision and OmniBank Databases. Within 30 days
after the Effective Date, Lexicon shall provide BMS with [**] access, using [*],
to the LexVision and OmniBank Databases in their most current versions as of the
access activation date. BMS shall access the LexVision and OmniBank Databases
through one or more servers in secure locations at its principal research
facilities in Princeton and Hopewell, New Jersey and Wallingford, Connecticut;
provided, however, BMS shall be entitled to access the LexVision and OmniBank
Databases remotely from computers which are part of a BMS intranet system. [**].
Up to [**] concurrent BMS users (and [**] total users) at BMS's principal
research facilities in Princeton and Hopewell, New Jersey, and Wallingford,
Connecticut, shall be permitted to access the LexVision and OmniBank Databases
through such servers at any given time. BMS shall take

                                       18
<PAGE>   20

reasonable precautions to restrict access to the LexVision and OmniBank
Databases to the scientists and other employees of BMS and its Affiliates who
have access to BMS's own proprietary gene databases, including without
limitation all precautions BMS employs with respect to its own proprietary gene
databases. BMS shall not provide any Academic Collaborator, Corporate Partner or
other Third Party with direct access to the LexVision or OmniBank Databases and,
except as provided in Section 3.5, shall not disclose any OST or other
information contained therein to any Academic Collaborator, Corporate Partner or
other Third Party.

         4.2 Updates to the LexVision and OmniBank Databases. During the
Collaboration Term, Lexicon will use commercially reasonable efforts to update
the LexVision and OmniBank Database, [**] at least once every two months, and
Lexicon shall, in all events, make such updates for BMS at least as frequently
and promptly as Lexicon makes updates available to other subscribers to the
LexVision or OmniBank Databases, as the case may be. Without limiting the
foregoing, Lexicon will use commercially reasonable efforts to include in the
LexVision Database Level 1 S-T-V phenotypic data (as described on Exhibit
1.50-A, as may be modified from time to time) for the following numbers of
murine genes upon the following schedule:

             Deadline                             Number of Genes (Total)
             --------                             -----------------------
             [**]

[**].

         4.3 Support for the LexVision and OmniBank Databases.

                  4.3.1 During the Collaboration Term, Lexicon will provide
         reasonable technical support for the LexVision and OmniBank Databases
         during normal business hours (9:00 a.m. to 5:00 p.m. Central time).
         Requests for support shall be coordinated by the Project Coordinator
         designated by each party.

                  4.3.2 If the LexVision Database and/or OmniBank Database
         malfunctions or for some reason becomes nonoperational, BMS shall
         notify Lexicon within [**] of such occurrence. Lexicon shall respond to
         all such notices within [**] of receipt and shall use reasonable
         efforts to correct defects in the LexVision Database and/or OmniBank
         Database within time frames corresponding to the severity of the
         defects, as agreed upon by Lexicon and BMS.

                  4.3.3 Lexicon shall provide BMS with any update, enhancements,
         modifications or "bug fixes" made by Lexicon that it makes available to
         its Third Party licensees generally. Furthermore, BMS shall have the
         right to purchase, lease or license from Lexicon improvements to the
         LexVision Database and/or OmniBank Database (or any component thereof)
         that Lexicon makes available for sale, lease or license to any other
         Third Party licensee, all at Lexicon's standard or list prices
         therefor.

                  4.3.4 Both parties shall use all reasonable efforts to
         minimize any the downtime of the LexVision Database and OmniBank
         Database and shall discuss, in good faith,

                                       19
<PAGE>   21

         equitable adjustment of the parties' respective obligations under this
         Agreement as a result of any extraordinary period of downtime.

         4.4 BMS Designation of Genes for Inclusion in LexVision Database.

                  4.4.1 In each year of the Collaboration Term, BMS will have
         the right to designate for inclusion in the LexVision Database up to
         [**] of the murine genes to be included in the LexVision Database
         during each Performance Year pursuant to Section 4.2. BMS shall
         designate such genes by written notice in the form attached hereto as
         Exhibit 4.4.1 delivered to Lexicon (i) within [**] of the Effective
         Date for the murine genes designated by BMS for the first Performance
         Year and (ii) no fewer than [**] prior to each anniversary of the
         Effective Date for the murine genes designated by BMS for each
         subsequent Performance Year. [**].

                  4.4.2 [**].

                  4.4.3 If BMS does not provide Lexicon with the murine DNA
         sequence for the gene for which it desires a Selected Mutation (e.g.,
         BMS provides only a human DNA expressed sequence tag or full-length
         coding region for which it desires Lexicon to obtain the murine
         homolog), Lexicon will use commercially reasonable efforts in
         performing the following activities in the following order: [**].

                  4.4.4 In the event (i) Lexicon has already initiated a project
         for the generation of a mouse with a Selected Mutation in any murine
         gene designated by BMS pursuant to Section 4.4.1, (ii) a Third Party
         licensee of Lexicon has already designated such murine gene for
         inclusion in the LexVision Database, or (iii) Lexicon is unsuccessful
         in identifying the murine homolog of a human expressed sequence tag or
         full-length coding region provided by BMS pursuant to Section 4.4.3,
         Lexicon shall, within [**] after receipt of BMS's designation of such
         gene or such failure by Lexicon, as the case may be, notify BMS, and
         BMS shall thereafter be entitled, but not required, to designate a
         replacement gene. BMS shall designate any such replacement gene no
         later than [**] after receiving such notice from Lexicon.

                  4.4.5 [**].


                ARTICLE 5. DEVELOPMENT AND SUPPLY OF MUTANT MICE

         5.1 General. Subject to the terms of this Agreement, and subject to
Lexicon's pre-existing obligations pursuant to its agreement with the Merck
Genome Research Institute, upon the written request of BMS, Lexicon shall
develop and deliver Mutant Mice containing a particular Selected Mutation as may
be specifically requested by BMS.

         5.2 Requests for Mutant Mice, Clones by BMS. During each year of the
Collaboration Term, BMS shall have the option, subject to the provisions of
Exhibit 5.2-A and the other terms and conditions of this Agreement, to request
that Lexicon develop and deliver to BMS:

                  (a) up to [**] lines of Mutant Mice [**];

                                       20
<PAGE>   22

                  (b) up to [**] lines of Mutant Mice [**]; and

                  (c) up to [**] lines of Mutant Mice [**].

BMS shall make such requests in writing, in the form attached hereto as Exhibit
5.2-B or Exhibit 5.2-C that is appropriate for such request. BMS acknowledges
that Lexicon cannot predict the precise effect, if any, on gene function
resulting from any Selected Mutation, and that Mutant Mice may or may not have
one or more lox sites in their genomes, depending on the Selected Mutation
requested. Notwithstanding any other provision of this Agreement, (i) BMS's
right to request the delivery under Section 5.2(a) or (b) of any line of Mutant
Mice shall survive until [**]. BMS's right to request the delivery of any line
of Mutant Mice under Section 5.2(c) shall expire on the termination or
expiration of the Collaboration Term.

[**].

         5.3 Development of Mutant Mice by Lexicon. Following a request by BMS
that Lexicon develop and deliver a particular line of Mutant Mice, Lexicon shall
provide BMS with quarterly reports regarding Lexicon's efforts in developing
such Mutant Mouse and shall permit BMS scientists to confer with the Lexicon
scientists who are developing such lines of Mutant Mice, from time to time, at
mutually convenient times coordinated by the Project Coordinator for each party.
Development of a Mutant Mouse for BMS pursuant to this Agreement shall be deemed
complete, and the Mutant Mouse deemed ready for shipment under Section 5.5, when
Lexicon has [**]. Notwithstanding the foregoing, BMS may request shipment of
heterozygous mice prior to the time Lexicon has [**], in which case Lexicon will
ship such Mutant Mouse under Section 5.5 as promptly as practicable following
such request; provided that Lexicon shall have no obligation to ship such Mutant
Mice unless Lexicon determines, in its sole discretion, that it will have
sufficient heterozygous mice following such shipment to complete the development
of such line of Mutant Mice without delay. It is understood by the parties that
Lox Mutant Mice, Cre-Lox Mice and Non-Cre-Lox Mutant Mice delivered by Lexicon
will be heterozygous at the Selected Mutation.

         5.4 Maintenance of Back-Up Colonies. For a period of [**], Lexicon
shall retain a small back-up colony of approximately two cages of such mice
(approximately five mice per cage), for breeding of mice from such colony, if
requested by BMS, for delivery as Mutant Mice. Thereafter, Lexicon shall [**].
For a period of [**], Lexicon shall retain a small back-up colony of
approximately two cages of such Mutant Mice (approximately five mice per cage),
for the purpose of replacing mice shipped to BMS under this Article 5 which die
during or within [**] after shipment to BMS hereunder. Thereafter [**], Lexicon
shall [**]. In the event BMS requests that Lexicon maintain any such colony for
a period of more than [**], BMS shall pay Lexicon a storage and maintenance
charge of [**] for such requested line of Mutant Mice for each additional month
that Lexicon maintains such colony at BMS's request.

         5.5 Delivery Terms and Conditions. BMS shall be responsible for making
shipping arrangements for all Mutant Mice to be shipped to BMS from Lexicon. BMS
shall also be responsible for complying with all customs, regulations,
veterinary handling procedures and protocols, and obtaining any and all permits,
forms or permissions that may be required for BMS to accept shipment of Mutant
Mice from Lexicon. To facilitate timely compliance with such

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<PAGE>   23

requirements, a copy of a standard Lexicon mutant mouse shipping and transfer
report is attached in Exhibit 5.5. Lexicon will specify a reputable, experienced
shipping company located in the same metropolitan area as Lexicon with which BMS
may make arrangements for shipping and delivery of such Mutant Mice. Lexicon
shall ship to BMS at least one female and one male Mutant Mouse with the
Selected Mutation, each of breeding age (i.e., a "breeding pair"), promptly
following its receipt of payment and written notice that BMS has completed the
necessary shipping arrangements. Risk of loss with respect to any Mutant Mice to
be transferred under this Section 5.5 shall pass to BMS upon delivery thereof to
the shipping company designated as specified herein. If BMS fails to complete
the necessary shipping arrangements and provide such notice within [**] after
Lexicon's delivery of a notice pursuant to Section 5.3, BMS shall pay Lexicon a
storage and maintenance charge of [**] for such requested line of Mutant Mice
for each month thereafter until Lexicon receives notice of the completion of
such shipping arrangements. All out-of-pocket transportation and transfer costs
associated with the transfer and delivery of Mutant Mice requested by BMS under
Section 5.2(a) or (b) from Lexicon to BMS shall be paid by Lexicon. All
out-of-pocket transportation and transfer costs associated with the transfer and
delivery of Mutant Mice requested by BMS under Section 5.2(c) from Lexicon to
BMS shall be paid by BMS.

         5.6 Reasonable Efforts. Lexicon shall use commercially reasonable
efforts to complete the generation [**] of (i) Mutant Mice made by the OmniBank
Method within [**] of the date of BMS's request, (ii) Lox Mutant Mice and
Non-Cre-Lox Mutant Mice made by Homologous Recombination within [**] of the date
of BMS's request, and (iii) Cre-Lox Mice made by Homologous Recombination within
[**] of the date of BMS's request. Lexicon shall use commercially reasonable
efforts to complete the development of Mutant Mice, in accordance with the
criteria specified in Section 5.3, within [**] thereafter. BMS recognizes that
the production of Mutant Mice involves a number of technologically complex steps
and that technical obstacles may prevent Lexicon from producing Mutant Mice on
the schedule provided for herein. Lexicon shall immediately notify BMS of any
such technical obstacle encountered and its analysis of whether the obstacle can
be overcome and the time required to do so. If, after consultation with BMS,
Lexicon determines that production of such Mutant Mice within the time periods
provided for herein is not feasible using commercially reasonable efforts,
Lexicon may notify BMS in writing that it is extending the relevant delivery
date to a date that can be accomplished using commercially reasonable efforts;
provided that BMS may [**].

         5.7 No Infringement of Third Party Rights. Lexicon shall not be
obligated to develop, produce or deliver a Mutant Mouse where Lexicon reasonably
believes, with the advice of its counsel and the Steering Committee, that such
action would infringe upon the intellectual property rights of a Third Party. In
such event, the Steering Committee shall adopt an acceptable solution including,
but not limited to, the identification by BMS of an alternative Mutant Mouse
and, subject to Section 7.2, the production, development and analysis by Lexicon
of non-infringing Mutant Mice. [**].

         5.8 [**].

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<PAGE>   24

                      ARTICLE 6. S-T-V PHENOTYPIC ANALYSIS

         6.1 Level 1 S-T-V Phenotypic Screens.

                  6.1.1 Lexicon shall conduct Level 1 S-T-V phenotypic analysis
         for each line of Mutant Mice (excluding Cre Mice) developed under
         Section 5.2(c) and deliver data and results from such analysis to BMS.
         BMS shall have the non-exclusive right to use the data and results from
         such analysis (and the right to provide same to any of BMS' Corporate
         Partners and Academic Collaborators in accordance with Section 3.5), as
         well as a non-exclusive right and license, as provided in Section 3.1
         (with the right to sublicense same to any of BMS' Corporate Partners
         and Academic Collaborators in accordance with Section 3.5) under the
         Lexicon Technology to use any Invention owned by Lexicon under Section
         8.1.3 that arises directly from such analysis.

                  6.1.2 Lexicon shall not make any data, results or Inventions
         from an S-T-V Project performed for BMS under Section 6.1.1 accessible
         to Third Party licensees of the Lexicon Technology until [**] from the
         date same is provided to BMS, provided that Lexicon may disclose such
         data, results and Inventions (i) [**] or (ii) to Third Parties
         generally if Lexicon can demonstrate to BMS's reasonable satisfaction
         that Lexicon had already initiated a project for the development of a
         mouse with a Selected Mutation in the same gene prior to BMS's
         disclosure of such gene to Lexicon.

         6.2 Level 2 and Level 3 S-T-V Projects.

                  6.2.1 Terms for Level 2 and Level 3 S-T-V Projects shall be
         negotiated in good faith between the parties on a target-specific
         basis. Unless otherwise mutually agreed, the consideration to Lexicon
         for the conduct of any Level 2 or Level 3 S-T-V Project shall include
         payments for project costs, and, [**]. Unless otherwise mutually
         agreed, BMS and Lexicon exclusively shall have the right to use the
         data and results from each Level 2 and Level 3 S-T-V Project (and BMS
         shall have the right to provide same to any of BMS' Corporate Partners
         and Academic Collaborators in accordance with Section 3.5), and BMS
         shall have a right and license (with the right to sublicense same to
         any of BMS' Corporate Partners and Academic Collaborators in accordance
         with Section 3.5) under the Lexicon Technology to use any Invention
         owned by Lexicon under Section 8.1.4 that arises directly from such
         analysis. [**].

                  6.2.2 Neither party will have the right to disclose any data,
         results or Inventions from an S-T-V Project performed for BMS under
         Section 6.2.1 to any Third Party, except that BMS will have the right
         to disclose such data, results and Inventions to Academic Collaborators
         and Corporate Partners who need to know same for purposes of their
         collaborations with BMS; provided that, [**].


                               ARTICLE 7. PAYMENTS

         7.1 Access Fees.

                  7.1.1 Subject to the remainder of this Section 7.1, in
         consideration of the rights and licenses granted to BMS during the
         Collaboration Term hereunder, BMS agrees to pay Lexicon, during the
         Collaboration Term, access fees (each, an "Access Fee") in the

                                       23
<PAGE>   25

         aggregate amount of [**] per Performance Year, payable as provided
         herein. The Access Fee for any Performance Year will be payable in
         increments of [**], each increment to be payable upon Lexicon's
         inclusion in the LexVision Database of Level 1 S-T-V phenotypic data
         for each [**] new murine genes (each, a "Data Set"); provided, however,
         that [**]. Payments shall be made within [**] after the first day of
         each calendar quarter after the Effective Date (each, a "Payment Date")
         with respect to the increments of the annual Access Fee payable as a
         result of the Data Set(s) included in the LexVision Database during the
         preceding calendar quarter, until the full amount of the Access Fee for
         such Performance Year has been paid, provided that (i) the first
         increment of the Access Fee payable for the first Performance Year
         shall be payable within [**] and (ii) once BMS has paid the full amount
         of the Access Fee for a given year, no further Payment Dates shall
         occur until the beginning of the next Performance Year. Payments shall
         be made only with respect to complete Data Sets. Partial Data Sets
         delivered during a calendar quarter shall be carried over; when any
         such partial Data Set is subsequently completed, the entire completed
         Data Set shall deemed to be included in the LexVision Database in the
         quarter in which it is completed. Any Data Set delivered after the full
         amount of the Access Fee for the then-current Performance Year has
         become payable will be carried over and credited, for purposes of this
         Section 7.1.1, as having been delivered in the first quarter of the
         next Performance Year.

                  7.1.2 In the event that Lexicon has not included at least one
         complete Data Set in the LexVision Database during the calendar quarter
         preceding a Payment Date, such Payment Date automatically shall be
         postponed until Lexicon has included the next complete Data Set. For
         the avoidance of doubt, more than one Payment Date may be in
         postponement at any given time.

                  7.1.3 [**].

                  7.1.4 [**].

                  7.1.5 [**].

                  7.1.6 [**].

         7.2 Fees for Development of Mutant Mice. The following fees shall be
payable for Mutant Mice made and delivered to BMS pursuant to Section 5 and/or
genes designated by BMS under 4.4 for which BMS has requested that Lexicon
generate Mutant Mice with Selected Mutations containing lox sites:

                  (a) [**] for each line of Mutant Mice, for the first [**]
         lines of Mutant Mice requested by BMS during any year of the
         Collaboration Term pursuant to Section 5.2(a) and delivered by Lexicon,
         and [**] for each such line of Mutant Mice in excess of the first [**]
         requested by BMS during any year of the Collaboration Term, which shall
         be payable within [**];

                                       24
<PAGE>   26

                  (b) [**] for each line of [**] requested by BMS pursuant to
         Section 5.2(b) and delivered by Lexicon to BMS, which shall be payable
         within [**];

                  (c) The amounts specified below for each line of Mutant Mice
         requested by BMS pursuant to Section 5.2(c) and delivered by Lexicon to
         BMS, [**]:

                  Homologous Recombination "standard knockout allele"  [**]
                  OmniBank Mutant Mouse                                [**]
                  Lox Mutant Mouse                                     [**]
                  Humanized Mutant Mouse                               [**]
                  TET-System Mouse                                     [**]

                  (d) An additional license fee of [**] for each line of Mutant
         Mice with a conditional allele incorporating Cre-Lox Technology, which
         shall be payable [**];

                  (e) An additional license fee of [**] for each Mutant Mouse
         line incorporating TET-System Technology, which shall be payable within
         [**];

                  (f) An additional license fee of [**] for each Mutant Mouse
         line incorporating green fluorescent protein technology (the "GFP
         Technology"), which shall be payable within [**]; and

[**] for each gene designated by BMS under Section 4.4 for which BMS has
requested that Lexicon generate Mutant Mice with a Selected Mutation containing
lox sites, which fee shall be payable [**].

         7.3 Milestone Payments Payable by BMS.

                  7.3.1 BMS shall pay Lexicon the following milestone payments
         for each Product:

                  Milestone                     Amount of Milestone Payment
                  ---------                     ---------------------------
                  [**]

                  7.3.2 BMS shall promptly notify Lexicon of the first
         occurrence of any milestone with respect to each Product, and milestone
         payments shall be made within [**] days after such occurrence.
         Milestone payments shall be made only once with respect to any given
         Product, regardless of the number of indications sought (or approvals
         obtained) for such Product, whether alone or in combination with other
         products, and regardless of any new dosage strengths, preparations or
         forms of administration for such Product.

                  7.3.3 If BMS develops as a back-up Product that inhibits or
         otherwise modulates the activity of a particular molecular target of a
         Product on which BMS is already making milestone payments, then BMS may
         conduct clinical development on such back-up or follow-on Products and
         shall not be obligated to make any milestone

                                       25
<PAGE>   27

         payments with respect to any such back-up or follow-on Product, except
         as otherwise provided below. In the event that a particular Product is
         dropped from active clinical development work or marketing for safety
         or efficacy reasons and is specifically replaced with a different
         Product targeting the same molecular target as such dropped Product,
         such new Product shall be deemed a "Replacement Product." BMS shall not
         be obligated to make milestone payments that were earlier made with
         respect to a dropped Product and replaced by a Replacement Product,
         but, subject to Section 7.3.2, BMS shall pay all milestone payments for
         milestone events achieved by such Replacement Product that had not been
         achieved by such dropped Product.

         7.4 Royalties Payable by BMS.

                  7.4.1 Royalties on Net Sales. In consideration of the licenses
         granted to BMS under Section 3.1, BMS shall pay to Lexicon a royalty of
         [**] on cumulative Net Sales of each Royalty-Bearing Product by BMS,
         its Affiliates and its Corporate Partners.

                  7.4.2 Royalty Reports; Exchange Rates. During the term of this
         Agreement following the First Commercial Sale of any Royalty-Bearing
         Product, BMS shall, within [**] after each calendar quarter, furnish to
         Lexicon a written quarterly report showing: (i) the gross sales and Net
         Sales of Royalty-Bearing Products sold by BMS and its Affiliates and
         Corporate Partners during the reporting period and the calculation of
         Net Sales from such gross sales; (ii) the royalties payable in United
         States dollars which shall have accrued hereunder in respect of such
         Net Sales; (iii) withholding taxes, if any, required by law to be
         deducted in respect of such royalties; (iv) the dates of the First
         Commercial Sales of Royalty-Bearing Products in any country during the
         reporting period; and (v) the exchange rates used in determining the
         amount of United States dollars payable hereunder. Royalties payable on
         sales in countries other than the United States shall be calculated in
         accordance with the standard exchange rate conversion practices used by
         BMS for financial accounting purposes. If no royalty or payment is due
         for any royalty period hereunder, BMS shall so report. BMS shall keep,
         and shall require its Corporate Partners to keep (all in accordance
         with generally accepted accounting principles, consistently applied),
         complete and accurate records in sufficient detail to properly reflect
         all gross sales and Net Sales and to enable the royalties payable
         hereunder to be determined.

                  7.4.3 Audits. Upon the written request of Lexicon, BMS shall
         permit an independent certified public accountant selected by Lexicon
         and acceptable to BMS, which acceptance shall not be unreasonably
         withheld, to have access, at reasonable times and during normal
         business hours, to such records of BMS as may be reasonably necessary
         to verify the accuracy of the royalty reports described herein, in
         respect of any fiscal year ending not more than [**] prior to the date
         of such request. Lexicon and BMS shall use commercially reasonable
         efforts to schedule all such verifications within [**] after Lexicon
         makes its written request. All such verifications shall be conducted
         not more than once in, or with respect to, each calendar year. The
         report of Lexicon's independent certified public accountant shall be
         made available to both parties. Subject to BMS's rights under Section
         13.6, in the event Lexicon's independent certified public accountant
         concludes that additional royalties were owed to Lexicon for such
         period, the

                                       26
<PAGE>   28

         additional royalty shall be paid by BMS within [**] of the date Lexicon
         delivers to BMS such independent certified public accountant's written
         report so concluding, unless such report contains manifest error. In
         the event Lexicon's independent certified public accountant concludes
         that there was an overpayment of royalties to Lexicon during such
         period, the overpayment shall be repaid by Lexicon within [**] of the
         date Lexicon received such independent certified public accountant's
         written report so concluding, unless such report contains manifest
         error. The fees charged by such independent certified public accountant
         shall be paid by Lexicon unless such audit discloses an underpayment of
         more than [**] of the amount due under this Agreement for the period in
         question, in which case BMS will bear the full cost of such audit. BMS
         shall include in each agreement with each applicable Corporate Partner
         a provision requiring the Corporate Partner to make reports to BMS, to
         keep and maintain records of sales made pursuant to such agreement and
         to grant access to such records by Lexicon's independent certified
         public accountant to the same extent required of BMS under this
         Agreement. Lexicon agrees that all information subject to review under
         this Section 7.4.3 or under any agreement with a Corporate Partner of
         BMS is confidential and that Lexicon shall cause its independent
         certified public accountant to retain all such information in
         confidence. Lexicon's independent certified public accountant shall
         only report to Lexicon as to the computation of the royalties and other
         payments due to Lexicon under this Agreement and shall not disclose to
         Lexicon any other information of BMS or its Corporate Partner.

                  7.4.4 Royalty Payment Terms. Royalty payments for each
         calendar quarter shall be due at the time BMS's report under Section
         7.4.3 for such calendar quarter shall be due.

         7.5 Withholding Taxes. In the event that any royalties or other
payments due to Lexicon are subject to withholding tax required by law to be
paid to the taxing authority of any foreign country, the amount of such tax may
be withheld from the applicable royalties or other payment due Lexicon. BMS
shall promptly pay such tax on behalf of Lexicon and shall furnish Lexicon with
a certificate of withholding tax so deducted for Lexicon's avoidance of
duplicate taxation in United States. BMS may not deduct any other withholding or
any other governmental charges from the payments agreed upon under this
Agreement, except to the extent same are paid on behalf of, or for the benefit
of, Lexicon. BMS shall maintain official receipts of payment of any such
withholding taxes and shall forward such receipts to Lexicon.

         7.6 Blocked Currency. If by law, regulation, or fiscal policy of a
particular country, conversion into United States dollars or transfer of funds
of a convertible currency to the United States is restricted or forbidden, BMS
shall give Lexicon prompt written notice and shall pay the royalty due under
this Article 7 through such means or methods as are lawful in such country as
Lexicon may reasonably designate. Failing the designation by Lexicon of such
lawful means or methods within [**] after such written notice is given to
Lexicon, BMS shall deposit such royalty payment in local currency to the credit
of Lexicon in a recognized banking institution designated by Lexicon, or if none
is designated by Lexicon within the [**] period described above, in a recognized
banking institution selected by BMS and identified in a written notice to
Lexicon by BMS, and such deposit shall fulfill all obligations of BMS to Lexicon
with respect to such royalties.

                                       27
<PAGE>   29

         7.7 Interest on Late Payments. Lexicon shall have the right to seek to
collect interest on any payments that are not paid on or before [**] after the
date such payments are due under this Agreement at a rate of [**] per month,
calculated on the total number of days payment is delinquent; provided, however,
that interest shall not accrue pursuant to this Section 7.7 on any amounts
payable under this Agreement with respect to which payment is disputed in good
faith; provided, further that interest shall accrue pursuant to this Section 7.7
in the event such dispute has been resolved in Lexicon's favor if payment is not
made promptly thereafter.

         7.8 Manner of Payment. Except as provided in Section 7.6, payments to
be made by BMS to Lexicon under this Agreement shall be payable in United States
dollars and shall be paid by check delivered to Lexicon at its principal office
at The Woodlands, Texas or bank wire transfer in immediately available funds to
such bank account in the State of Texas as is designated in writing by Lexicon
from time to time.


                        ARTICLE 8. INTELLECTUAL PROPERTY

         8.1 Ownership of Intellectual Property.

                  8.1.1 Ownership by Lexicon of the LexVision and OmniBank
         Databases and the OmniBank Library. Subject to the rights and licenses
         granted under this Agreement, Lexicon (and its licensors, as
         applicable) shall own and retain all rights to: (i) the LexVision and
         OmniBank Databases and all information contained therein; and (ii) the
         OmniBank Library, and all embryonic stem cells, genes and mutated
         genes, lox sites and other biological materials contained therein.

                  8.1.2 Ownership of Mutant Mice and Progeny. Subject to the
         rights and licenses granted under this Agreement, Lexicon shall own and
         retain all rights to the Mutant Mice and any successive generations
         thereof, including without limitation the right to use, produce, breed,
         sell or license the Mutant Mice or any successive generations thereof,
         to use any cells or genes derived by Lexicon from the Mutant Mice or
         any successive generations thereof, and to use the Lexicon Technology.

                  8.1.3 Ownership of Inventions Arising from S-T-V Projects.
         Subject to the rights and licenses granted under this Agreement,
         Lexicon shall own and retain all rights to any Invention that is
         conceived or first reduced to practice by Lexicon or any of its
         Affiliates during the course of any S-T-V Project performed under this
         Agreement.

                  8.1.4 Ownership of Inventions Arising from Further BMS
         Development. As between the parties, and subject to the provisions of
         Section 3.4, BMS shall own and retain all rights to any Invention that
         is conceived or first reduced to practice by BMS or any of its
         Affiliates, Academic Collaborators or Corporate Partners during the
         course of any further development by any of them of, or based upon, any
         data or results included in the LexVision or OmniBank Databases and/or
         provided by Lexicon in connection with any S-T-V Project performed
         under this Agreement.

                  8.1.5 Ownership of Inventions Arising from Further Lexicon
         Development; Disclosure. In the event Lexicon chooses to engage in
         further development of Level 1

                                       28
<PAGE>   30

         S-T-V analytical data or results other than as part of a Level 2 and/or
         Level 3 S-T-V Project in collaboration with BMS, then, subject to the
         provisions of Section 3.4, Lexicon shall own and retain all rights to
         any Invention that is conceived or first reduced to practice during the
         course of such further development; provided, however, that if Lexicon
         chooses to engage in any such further development during the
         Collaboration Term or the twelve (12) months thereafter relating
         specifically to any gene that BMS has designated pursuant to Section
         4.4, Lexicon shall so notify BMS, and the parties shall negotiate,
         diligently and in good faith, regarding terms for a Level 2 or Level 3
         S-T-V Project under Section 6.2 relating to such gene if BMS notifies
         Lexicon within [**] of Lexicon's notice that BMS wishes to participate
         in such further development.

                  8.1.6 Ownership of Other Intellectual Property. Subject to
         Article 3 and Sections 8.1.1 through 8.1.5, (i) each party shall own
         and retain all rights to all Inventions which are not Joint Inventions
         and which are conceived or reduced to practice solely by its employees,
         Affiliates or agents, and (ii) the parties shall jointly own all Joint
         Inventions, and each owner of a Joint Invention shall have and retain
         sole and exclusive title to its interest in such Joint Invention;
         provided, that, the responsibility for patent filing with respect to
         each Joint Invention developed hereunder shall be as set forth in
         Section 8.2; and provided, further, that each party shall have a right
         of first negotiation with respect to any interest of the other party in
         any Joint Invention that such other party wishes to dispose of. A party
         that wishes to dispose of its interest in a Joint Invention shall
         notify the other party. If the other party wishes to exercise its right
         of first negotiation, it shall so notify the first party within [**]
         after receiving such notice. Thereafter, the parties shall negotiate,
         diligently and in good faith, the terms upon which the other party
         shall succeed to the first party's interest in such Joint Invention.
         Such negotiations shall continue for a period of at least [**].
         Thereafter, unless the parties agree to continue such negotiations, the
         first party shall be free to dispose of its interest in such Joint
         Invention without any further obligation to the other party. In no
         event, however, shall a party transfer its interest in a Joint
         Invention to a Third Party unless such Third Party agrees in writing to
         be bound by the terms of this Agreement with respect to the interest so
         transferred.

         8.2 Responsibility for Patents.

                  8.2.1 Solely Owned Inventions. Each party shall have the
         right, but not the obligation, at its sole expense, to prepare, file,
         prosecute and maintain any patent applications, patents, registration
         of copyrights or other intellectual property rights directed to any
         Invention owned solely by such party.

                  8.2.2 Jointly Owned Inventions. The Steering Committee shall
         determine whether, and in what jurisdictions, to seek patent protection
         with respect to any Joint Invention. Lexicon shall have the first right
         to assume responsibility at its sole expense for the preparation,
         filing, prosecution and maintenance of any patent applications and
         patents, or registration of copyright or other intellectual property
         rights directed to Joint Inventions, keeping BMS reasonably informed
         of, and consulting with BMS with respect to, all significant actions
         relating thereto. If Lexicon elects not to assume such responsibility,
         BMS shall have the right to do so at its sole expense.

                                       29
<PAGE>   31

         8.3 Patent Enforcement; Infringement. Each party shall have the right,
but not the obligation, to take action against any Third Party who is, or is
allegedly, infringing any patent contemplated by this Agreement that such party
owns hereunder. Each party shall promptly inform the other party of any such
infringement or alleged infringement of such other party's patents, to the
extent the first party is aware of same. In the event a party's exercise of any
of the rights granted to it hereunder gives rise to a claim of infringement of a
patent owned by a Third Party, the Steering Committee (or, if no Steering
Committee is then in existence, the Senior Vice President, Early Development and
Applied Technology at BMS, or such other appropriate officer of BMS, and the
Chief Executive Officer at Lexicon, or such other appropriate officer of
Lexicon) shall confer and agree upon the best method for responding to and/or
defending against such claim and how the costs thereof and the payment of any
damages (and, in the event of any counterclaims, the receipt of any damages)
with respect thereto shall be allocated between the parties. Any such
determination shall take into account each party's significant interest in
controlling any defense of a claim made against itself and the respective
parties' indemnification obligations under Article 11.


                           ARTICLE 9. CONFIDENTIALITY

         9.1 Nondisclosure Obligations.

                  9.1.1 General. Except as otherwise provided in this Article 9,
         during the term of this Agreement and for a period of five years
         thereafter, each Receiving Party shall maintain the Confidential
         Information of each Disclosing Party in confidence and use it only for
         purposes specifically authorized under this Agreement.

                  9.1.2 Limitations. To the extent it is reasonably necessary or
         appropriate to fulfill its obligations or exercise its rights under
         this Agreement and subject to advance written notification to the
         Disclosing Party: (i) a party may disclose to Third Parties
         Confidential Information it is otherwise obligated not to disclose
         under this Section 9.1, to its Affiliates, Corporate Partners,
         consultants, outside contractors and clinical investigators, on a
         strict need-to-know basis for the purposes contemplated by this
         Agreement and on condition that such entities or persons agree to keep
         the Confidential Information confidential for the same time periods and
         to the same extent as such party is required to keep the Confidential
         Information confidential hereunder; and (ii) a party or its Corporate
         Partners may disclose, using appropriate measures to preserve
         confidentiality, such Confidential Information to government or other
         regulatory authorities to the extent that such disclosure is reasonably
         necessary to obtain authorizations to conduct clinical trials of, and
         to commercially market, Products pursuant to this Agreement.
         Furthermore, a Receiving Party may request permission from the
         Disclosing Party to disclose such Confidential Information to the
         extent that such disclosure is reasonably necessary to obtain patents
         which such Receiving Party is permitted to obtain hereunder, which
         permission shall not be unreasonably withheld or delayed.

                                       30
<PAGE>   32

         9.2 Injunctive Relief. The parties hereto understand and agree that
remedies at law may be inadequate to protect against any breach of any of the
provisions of this Article 9 by either party or their employees, agents,
officers or directors or any other person acting in concert with it or on its
behalf. Accordingly, each party shall be entitled to the granting of injunctive
relief by a court of competent jurisdiction against any action that constitutes
any such breach of this Article 9.

         9.3 Publication. BMS and/or Lexicon (each, a "Submitting Party") may
each publish or present data and/or results generated utilizing the Mutant Mice
or Progeny, subject to the prior review of the proposed disclosure by the other
party (each, a "Reviewing Party"), solely to determine (i) whether the proposed
disclosure contains the Confidential Information of the Reviewing Party or (ii)
whether the information contained in the proposed disclosure should be the
subject of a patent application to be filed by the Reviewing Party prior to such
disclosure. Each Submitting Party shall provide the Reviewing Party with the
opportunity to review any proposed abstract, manuscript or presentation which
discloses the results of research conducted utilizing the Mutant Mice or Progeny
by delivering a copy thereof to the Reviewing Party no less than [**] before its
intended submission for publication or presentation. The Reviewing Party shall
have [**] from its receipt of any such abstract, manuscript or presentation in
which to notify the Submitting Party in writing of any specific objections to
the disclosure, based on either the need to seek patent protection or concern
regarding the specific disclosure of the Confidential Information of the
Reviewing Party. In the event the Reviewing Party objects to the disclosure, the
Submitting Party agrees not to submit the publication or abstract or make the
presentation containing the objected-to information until the Reviewing Party is
given a reasonable additional period of time (not to exceed an additional [**])
to seek patent protection for any material in the disclosure which the Reviewing
Party believes is patentable (subject, in all events, to Section 8.2) or, in the
case of Confidential Information, to allow the Submitting Party to delete any
Confidential Information of the Reviewing Party from the proposed disclosure.
The Submitting Party agrees to delete from the proposed disclosure any
Confidential Information of the Reviewing Party upon request.


                   ARTICLE 10. REPRESENTATIONS AND WARRANTIES

         10.1 Representations, Warranties and Covenants of Lexicon. Lexicon
represents and warrants to and covenants with BMS that:

                  10.1.1 Lexicon is a corporation duly organized, validly
         existing and in corporate good standing under the laws of Delaware;

                  10.1.2 Lexicon has the corporate and legal right, authority
         and power to enter into this Agreement, and to extend the rights and
         licenses granted to BMS in this Agreement;

                  10.1.3 Lexicon has taken all necessary action to authorize the
         execution, delivery and performance of this Agreement;

                  10.1.4 upon the execution and delivery of this Agreement, this
         Agreement shall constitute a valid and binding obligation of Lexicon,
         enforceable in accordance with its

                                       31
<PAGE>   33

         terms, except as enforceability may be limited by applicable
         bankruptcy, insolvency, reorganization, moratorium or similar laws
         affecting creditors' and contracting parties' rights generally and
         except as enforceability may be subject to general principles of equity
         (regardless of whether such enforceability is considered in a
         proceeding in equity or at law);

                  10.1.5 the performance of Lexicon's obligations under this
         Agreement will not conflict with its charter documents or result in a
         breach of any agreements, contracts or other arrangements to which it
         is a party;

                  10.1.6 Lexicon will not during the term of this Agreement
         enter into any agreements, contracts or other arrangements that would
         be inconsistent with its obligations under this Agreement;

                  10.1.7 the summary of Lexicon's pre-existing obligations
         pursuant to its agreement with the Merck Genome Research Institute set
         forth in Exhibit 10.1.7 is accurate and complete in all material
         respects;

                  10.1.8 [**].

         10.2 Representations, Warranties and Covenants of BMS. BMS represents
and warrants to and covenants with Lexicon that:

                  10.2.1 BMS is a corporation duly organized, validly existing
         and in corporate good standing under the laws of the state of Delaware;

                  10.2.2 BMS has the corporate and legal right, authority and
         power to enter into this Agreement, and to extend the rights and
         licenses granted to Lexicon in this Agreement;

                  10.2.3 BMS has taken all necessary action to authorize the
         execution, delivery and performance of this Agreement;

                  10.2.4 upon the execution and delivery of this Agreement, this
         Agreement shall constitute a valid and binding obligation of BMS
         enforceable in accordance with its terms, except as enforceability may
         be limited by applicable bankruptcy, insolvency, reorganization,
         moratorium or similar laws affecting creditors' and contracting
         parties' rights generally and except as enforceability may be subject
         to general principles of equity (regardless of whether such
         enforceability is considered in a proceeding in equity or at law);

                  10.2.5 the performance of its obligations under this Agreement
         will not conflict with BMS's charter documents or result in a breach of
         any agreements, contracts or other arrangements to which it is a party;

                  10.2.6 BMS will not after the Effective Date enter into any
         agreements, contracts or other arrangements that would be inconsistent
         with its obligations under this Agreement;

                                       32
<PAGE>   34

                  10.2.7 [**]

                  10.2.8 BMS shall use the Cre-Lox Patent Rights, any Lox Mutant
         Mice, Cre-Lox Mutant Mice and/or Cre Mice that Lexicon may provide to
         BMS hereunder only in accordance with the terms of [**].

         10.3 Limited Warranties Relating to Performance of the LexVision and
OmniBank Databases. Lexicon warrants that the LexVision and OmniBank Databases
made available to BMS under this Agreement from time to time shall represent the
latest version of the LexVision and OmniBank Databases which Lexicon has made
available at each such time to subscribers to the LexVision and OmniBank
Databases. Lexicon does not represent that the operations of the LexVision and
OmniBank Databases will be trouble-free or that the LexVision or OmniBank
Databases contain no errors. Lexicon is, however, obligated to BMS, with respect
to the LexVision and OmniBank Databases, to periodically update the LexVision
and OmniBank Databases as provided in this Agreement and make every reasonable
effort to resolve any technical difficulties in a timely manner, as further
provided in Section 4.3.

         10.4 Limited Warranties Relating to the Development of Mutant Mice.
Except as otherwise expressly provided in this Agreement, Lexicon represents
that it will use commercially reasonable efforts to produce Mutant Mice upon
request by BMS. Lexicon does not represent that in all cases it will be
commercially and technically feasible to produce such Mutant Mice. Lexicon's
only obligation to BMS with respect to the production of Mutant Mice will be to
use commercially reasonable efforts to produce such Mutant Mice as requested by
BMS and to consult with the Steering Committee in the event of any material
difficulty.

         10.5 Warranty Disclaimer. EXCEPT AS OTHERWISE EXPRESSLY PROVIDED IN
THIS AGREEMENT, NEITHER PARTY MAKES ANY WARRANTY WITH RESPECT TO THE LEXVISION
DATABASE, THE OMNIBANK DATABASE, ANY MUTANT MOUSE, PROGENY, PATENT RIGHTS,
GOODS, SERVICES OR ANY OTHER SUBJECT MATTER OF THIS AGREEMENT, AND EACH PARTY
HEREBY DISCLAIMS WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
AND NON-INFRINGEMENT WITH RESPECT TO ANY AND ALL OF THE FOREGOING. IN ADDITION,
BMS ACKNOWLEDGES THAT THE LEXVISION DATABASE AND THE OMNIBANK DATABASE MAY
CONTAIN INFORMATION THAT IS COVERED BY ONE OR MORE VALID PATENTS OF THIRD
PARTIES, AND THAT THE USE OF A MUTANT MOUSE OR PROGENY MAY BE COVERED BY ONE OR
MORE VALID PATENTS OF THIRD PARTIES. EACH PARTY ACKNOWLEDGES THAT EXERCISE BY IT
OF THE RIGHTS AND LICENSES GRANTED TO IT PURSUANT TO SECTION 3.4 HEREOF MAY BE
COVERED BY ONE OR MORE VALID PATENTS OF THIRD PARTIES.

         10.6 Limited Liability. NOTWITHSTANDING ANYTHING ELSE IN THIS AGREEMENT
OR OTHERWISE TO THE CONTRARY, NEITHER LEXICON NOR BMS WILL BE LIABLE WITH
RESPECT TO ANY MATTER ARISING UNDER THIS AGREEMENT UNDER ANY CONTRACT,
NEGLIGENCE, STRICT LIABILITY OR OTHER LEGAL OR EQUITABLE THEORY FOR ANY
PUNITIVE, EXEMPLARY, INCIDENTAL OR CONSEQUENTIAL DAMAGES OR LOST PROFITS.

                                       33
<PAGE>   35

                              ARTICLE 11. INDEMNITY

         11.1 BMS Indemnity Obligations. BMS agrees to defend, indemnify and
hold Lexicon, its Affiliates and their respective employees and agents harmless
from all claims, losses, damages or expenses (including reasonable attorneys'
fees and costs of litigation) arising as a result of: (i) actual or asserted
violations of any applicable law or regulation by BMS, its Affiliates or
Corporate Partners by virtue of which any Products manufactured, distributed or
sold hereunder shall be alleged or determined to be adulterated, misbranded,
mislabeled or otherwise not in compliance with any applicable law or regulation;
(ii) claims for bodily injury, death or property damage attributable to the
manufacture, distribution, sale or use of any Products by BMS, its Affiliates or
Corporate Partners; (iii) a Product recall ordered by a governmental agency or
required by a confirmed Product failure as reasonably determined by the parties
hereto; or (iv) BMS's breach of any of its representations, warranties or
covenants hereunder.

         11.2 Lexicon Indemnity Obligations. Lexicon agrees to defend, indemnify
and hold BMS, its Affiliates and their respective employees and agents harmless
from all claims, losses, damages or expenses (including reasonable attorneys'
fees and costs of litigation) arising as a result of (i) the infringement of any
issued patent or valid copyright of any Third Party as a result of Lexicon's
delivery to BMS of access to the LexVision or OmniBank Databases or any Mutant
Mouse, or the use by BMS of the LexVision or OmniBank Databases or any Mutant
Mouse, pursuant to this Agreement, or (ii) Lexicon's breach of any of its
representations, warranties or covenants hereunder. In the event that any claim
of infringement under clause (i) of this Section 11.2 is, or in Lexicon's
judgment is likely to be, substantiated, Lexicon will use all commercially
reasonable efforts to obtain a license from the applicable Third Party to permit
the parties to continue to engage in the allegedly infringing activities
(hereinafter the "Infringing Activities"). If, after all commercially reasonable
efforts, Lexicon is unable to effect a satisfactory solution to any such
infringement claim regarding the Infringing Technology, Lexicon will have the
right to terminate BMS's rights under this Agreement solely with respect to the
Infringing Activities.

         11.3 Limitation on Indemnity Obligations. Neither party, its Affiliates
or their respective employees and agents shall be entitled to the indemnities
set forth in Sections 11.1 or 11.2, respectively, to the comparative extent the
claim, loss, damage or expense for which indemnification is sought was caused by
a grossly negligent, reckless or intentional act or omission by such party, its
directors, officers, employees or authorized agents.

         11.4 Procedure. If a party or any of its Affiliates or their respective
employees or agents (collectively, the "Indemnitee") intends to claim
indemnification under this Article 11, 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 shall assume the defense thereof with counsel selected by the
Indemnitor and reasonably acceptable to the Indemnitee, provided, however, that
an Indemnitee shall have the right to retain its own counsel, with the fees and
expenses to be paid by the Indemnitee, 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 party
represented by such counsel in such proceedings. The Indemnitor shall have the
right to settle or compromise any claims for which it is providing
indemnification under this Article 11,

                                       34
<PAGE>   36

provided that the consent of the Indemnitee (which shall not be unreasonably
withheld or delayed) shall be required in the event any such settlement or
compromise would adversely affect the interests of the Indemnitee. The indemnity
agreement in this Article 11 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. The failure to deliver notice to the
Indemnitor within a reasonable time after the commencement of any such action,
if prejudicial to the Indemnitor's ability to defend such action, shall relieve
such Indemnitor of any liability to the Indemnitee under this Article 11, 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 Article
11. The Indemnitee under this Article 11, its employees and agents, shall
cooperate fully with the Indemnitor and its legal representatives in the
investigation of any action, claim or liability covered by this indemnification.

         11.5 Insurance. BMS shall maintain appropriate product liability
insurance (and/or self-insurance) with respect to development, manufacture and
sale of Products by BMS in such amount as BMS customarily maintains with respect
to sales of its other products. BMS shall maintain such insurance for so long as
it continues to manufacture or sell Products, and thereafter for so long as BMS
customarily maintains insurance with respect to sales of its other products.


                     ARTICLE 12. EXPIRATION AND TERMINATION

         12.1 Collaboration Term.

                  12.1.1 Expiration. Unless this Agreement is sooner terminated
         in accordance with the provisions of this Article 12, the Collaboration
         Term shall commence on the Effective Date and shall expire on December
         31, 2005, provided that (i) each party shall have the option to
         terminate the Collaboration Term, without cause, as of December 31,
         2003, by providing the other party written notice of same no later than
         September 30, 2003, and (ii) the Collaboration Term may be extended
         upon the election of both parties by a written agreement having terms
         mutually agreeable to both parties.

                  12.1.2 Effect of Expiration of Collaboration Term. Following
         the expiration of the Collaboration Term, Lexicon shall have no further
         obligation under this Agreement to provide to BMS (i) updates to the
         LexVision or OmniBank Databases or any additional information of any
         nature relating thereto, (ii) any support services with respect to the
         LexVision or OmniBank Databases, except as the parties may further
         agree in writing, or (iii) any Mutant Mice (except for Mutant Mice
         ordered prior to the expiration of BMS's right to order same, as
         provided in Section 5.2) or the conduct of any S-T-V Project (except
         for S-T-V Projects commenced prior to the expiration of the
         Collaboration Term). Upon expiration of the Collaboration Term, BMS
         shall discontinue use of the LexVision and OmniBank Databases and shall
         remove any portions of the LexVision and OmniBank Databases from all
         computers at all sites on which such information may have been
         installed by BMS; provided, however, that BMS shall be entitled to
         continue to use the LexVision and/or OmniBank Databases for a
         reasonable period of time thereafter, for the purposes contemplated by
         this Agreement, in the event that Lexicon is required to provide any
         deliverables to BMS after the expiration of the Collaboration Term and
         use

                                       35
<PAGE>   37

         of the LexVision and/or OmniBank Databases is reasonably necessary or
         desirable for BMS's utilization of such deliverables. Following BMS's
         discontinuance of use of the LexVision and OmniBank Databases, any and
         all information, materials or documentation provided by Lexicon
         pursuant to this Agreement in connection therewith and all information
         relating thereto and any copies thereof (including electronic copies)
         shall be promptly returned by BMS to Lexicon, or upon Lexicon's written
         instruction, destroyed; provided that BMS may retain, and continue to
         use, copies of information from the LexVision and/or OmniBank Databases
         with respect to Mutant Mice for which it retains continuing rights,
         subject to BMS's compliance with the surviving terms and conditions of
         this Agreement. The expiration or termination of the Collaboration Term
         shall not affect BMS's right to continue to exercise its rights under
         Sections 3.1.2, 3.1.3 and 3.1.4 with respect to any Mutant Mice
         delivered by Lexicon hereunder or under Section 3.1.5, subject to BMS's
         compliance with the surviving terms and conditions of this Agreement.

         12.2 Expiration. Unless this Agreement is sooner terminated in
accordance with the provisions of this Article 12, this Agreement shall expire
and the licenses granted by Lexicon to BMS hereunder shall become fully paid, on
a Product-by-Product and country-by-country basis, on the latest to occur of (i)
[**] after the Effective Date, (ii) [**] after the First Commercial Sale of the
relevant Product or, (iii) upon the last to expire of any Valid Claim included
in the Lexicon Patent Rights covering such Product in such country.

         12.3 Events of Default.

                  12.3.1 Default by Either Party. An Event of Default by either
         party shall have occurred upon (i) the occurrence of a material breach
         of this Agreement if such party fails to remedy such breach within [**]
         after written notice thereof by the non-breaching party (or, if
         remediation of such breach in [**] is not practicable, if such party
         fails to commence and diligently pursue such remediation during such
         [**] period), or (ii) the commencement of any proceeding in or for
         bankruptcy, insolvency, dissolution or winding up by or against such
         party that is not dismissed or otherwise disposed of within [**]
         thereafter.

                  12.3.2 Default by Lexicon. For the avoidance of doubt, the
         entry against Lexicon of, or the entry into by Lexicon of, any
         judgment, decree, injunction, consent order, settlement agreement,
         cross-license or any other binding obligation, unappealable or
         unappealed during the time permitted for appeal (if applicable), that
         has the effect of materially adversely affecting BMS's exercise of its
         rights under this Agreement shall constitute an Event of Default by
         Lexicon, unless BMS has consented thereto, in writing, in advance.

                  12.3.3 Default by BMS. For the avoidance of doubt, an Event of
         Default shall have occurred if BMS fails to make any payments due
         hereunder, within [**] after Lexicon delivers written notice thereof to
         BMS specifying such failure and its claim of right to terminate, unless
         BMS makes such payments plus interest, calculated in accordance with
         Section 7.7, within such [**] period.
<PAGE>   38
         12.4 Effect of an Event of Default.


                  12.4.1 Remedies Available to Lexicon. If an Event of Default
         occurs relating to BMS, Lexicon shall have the right, at its option
         exercisable in its sole discretion, in addition to any other rights or
         remedies available to it at law or in equity and subject to the
         limitations set forth in Sections 2.4.2, 10.6 and 13.6 hereof, to
         terminate this Agreement upon [**] notice thereof to BMS, in which case
         (i) the licenses granted to BMS pursuant to Article 3 shall terminate,
         (ii) BMS shall discontinue use of the LexVision and OmniBank Databases,
         (iii) BMS shall return to Lexicon, or, upon Lexicon's written
         instruction, destroy all information, materials or documentation
         provided by Lexicon pursuant to this Agreement, including, without
         limitation, any materials derived from the LexVision or the OmniBank
         Databases and all information relating thereto and any copies thereof
         (including electronic copies) and (iv) BMS shall return to Lexicon, or,
         upon Lexicon's written instruction, destroy all Mutant Mice and any
         Progeny thereof.

                  12.4.2 Remedies Available to BMS. In the event that an Event
         of Default occurs relating to Lexicon, BMS shall have the right, at its
         option exercisable in its sole discretion, in addition to any other
         rights or remedies available to it at law or in equity and subject to
         the limitations set forth in Sections 2.4.2, 10.6 and 13.6 hereof, to
         terminate this Agreement upon notice thereof to Lexicon, in which case
         the rights and licenses granted to BMS pursuant to Sections 3.1.2,
         3.1.3, 3.1.4 and 3.1.5 shall, subject to BMS's obligations to pay
         milestones and royalties pursuant to Article 7, continue.

                  12.4.3 BMS Termination Right. In the event that (i) Lexicon
         has not added to the LexVision Database, in accordance with the terms
         and conditions of this Agreement, Level 1 S-T-V phenotypic data for at
         least [**] new murine genes by [**], or (ii) Lexicon has not completed
         [**], BMS shall have the right, at its option exercisable in its sole
         discretion, in addition to any other rights or remedies available to it
         at law or in equity and subject to the limitations set forth in
         Sections 2.4.2, 10.6 and 13.6 hereof, and whether or not such failure
         constitutes an Event of Default relating to Lexicon, to terminate this
         Agreement upon notice thereof to Lexicon, in which case the rights and
         licenses granted to BMS pursuant to Sections 3.1.2, 3.1.3, 3.1.4 and
         3.1.5 shall, subject to BMS's obligations to pay milestones and
         royalties pursuant to Article 7, continue.

         12.5 Effect of Expiration or Termination of Agreement. The expiration
or termination of this Agreement shall not relieve the parties of any obligation
accruing prior to such expiration or termination. The provisions of Articles 8,
9, 10, 11 and 12, and Sections 3.4 and 13.2 through 13.6 hereof shall survive
the expiration or termination of this Agreement. The provisions of Sections 7.3
through 7.7 hereof shall survive any termination of this Agreement under which
BMS retains the right to sell Products until such time as this Agreement would
have expired with respect to any Product or Royalty-Bearing Product, as the case
may be, in any country pursuant to Section 12.2 hereof had this Agreement not
been earlier terminated.


                                       37
<PAGE>   39
                            ARTICLE 13. MISCELLANEOUS

         13.1 Force Majeure. Neither party shall be held liable or responsible
to the other party nor be deemed to have defaulted under or breached this
Agreement for failure or delay in fulfilling or performing any obligation under
this Agreement when such failure or delay is caused by or results from causes
beyond the reasonable control of the affected party, including but not limited
to fire, floods, embargoes, war, acts of war (whether war is declared or not),
insurrections, riots, civil commotions, strikes, lockouts or other labor
disturbances, acts of God or acts, omissions or delays in acting by any
governmental authority; provided, however, that the party so affected shall use
reasonable commercial efforts to avoid or remove such causes of nonperformance,
and shall continue performance hereunder with reasonable dispatch whenever such
causes are removed. Either party shall provide the other party with prompt
written notice of any delay or failure to perform that occurs by reason of force
majeure. The parties shall mutually seek a resolution of the delay or the
failure to perform as noted above.

         13.2 Assignment. This Agreement may not be assigned or otherwise
transferred, in whole or in part, by either party without the consent of the
other party; provided, however, that either Lexicon or BMS may, without such
consent, assign its rights and obligations under this Agreement (i) to any
Affiliate, or (ii) in connection with a merger, consolidation or sale of such
portion of a party's assets that includes rights under this Agreement to an
unrelated Third Party; provided, further, that such party's rights and
obligations under this Agreement shall be assumed by its successor in interest
in any such transaction and shall not be transferred separate from all or
substantially all of its other business assets, including those business assets
that are the subject of this Agreement. Any purported assignment in violation of
the preceding sentence shall be void. Any permitted assignee shall assume all
obligations of its assignor under this Agreement, unless the parties otherwise
agree.

         13.3 Severability. Each party hereby agrees that it does not intend to
violate any public policy, statutory or common laws, rules, regulations, treaty
or decision of any government agency or executive body thereof of any country or
community or association of countries. Should one or more provisions of this
Agreement be or become invalid, the parties hereto shall substitute, by mutual
consent, valid provisions for such invalid provisions which valid provisions in
their economic effect are sufficiently similar to the invalid provisions that it
can be reasonably assumed that the parties would have entered into this
Agreement with such valid provisions in lieu of such invalid provisions. In case
such valid provisions cannot be agreed upon, the invalidity of one or several
provisions of this Agreement shall not affect the validity of this Agreement as
a whole, unless the invalid provisions are of such essential importance to this
Agreement that it is to be reasonably assumed that the parties would not have
entered into this Agreement without the invalid provisions.

         13.4 Notices. Any consent, notice or report required or permitted to be
given or made under this Agreement by one of the notification parties hereto to
the other shall be in writing, delivered personally or by facsimile (and
promptly confirmed by telephone, personal delivery or courier) or courier,
postage prepaid (where applicable), addressed to such other party at its address
indicated below, or to such other address as the addressee shall have last
furnished in writing to the addressor and shall be effective upon receipt by the
addressee.


                                       38
<PAGE>   40
         If to Lexicon:      Lexicon Genetics Incorporated
                             4000 Research Forest Drive
                             The Woodlands, Texas 77381
                             Attention:  Arthur T. Sands, M.D., Ph.D.
                                         President and Chief Executive Officer
                             Telephone:  (281) 364-0100
                             Facsimile:  (281) 364-0155

         If to BMS:          Bristol-Myers Squibb Company
                             P.O. Box 4000
                             Route 206 and Province Line Road
                             Princeton, New Jersey  08543-4000
                             Attention:  Vice President and Senior Counsel,
                                         Pharmaceutical Research Institute and
                                         Worldwide Business Development
                             Telephone:  (609) 252-4311
                             Facsimile:  (609) 252-4232


All such communications shall be effective upon receipt.

         13.5 Applicable Law. This Agreement shall be governed by and construed
in accordance with the laws of the State of Texas, without reference to the
conflicts of law principles thereof.

         13.6 Dispute Resolution. Subject to Section 2.4.2, the parties hereby
agree that they will first attempt in good faith to resolve any controversy or
claim arising out of or relating to this Agreement promptly by negotiations. If
a controversy or claim should arise hereunder, the matter shall be referred to
an individual designated by the Chief Executive Officer (or the equivalent
position) of Lexicon and by the Senior Vice President, Early Discovery and
Applied Technology (or the equivalent position) of BMS (the "Representatives").
If the matter has not been resolved within [**] of the first meeting of the
Representatives of the parties (which period may be extended by mutual
agreement) concerning such matter, the parties shall be free to pursue all
available recourse both at law and in equity.

         13.7 Entire Agreement. This Agreement, together with the exhibits and
appendices hereto and any confidentiality agreement(s) executed in contemplation
of this Agreement, contains the entire understanding of the parties with respect
to the subject matter hereof. All express or implied agreements and
understandings, either oral or written, heretofore made are expressly merged in
and made a part of this Agreement. This Agreement may be amended, or any term
hereof modified, only by a written instrument duly executed by both parties
hereto.

         13.8 Publicity. Lexicon and BMS each agree not to disclose any terms or
conditions of this Agreement to any Third Party without consulting the other
party prior to such disclosure. Notwithstanding the foregoing, prior to
execution of this Agreement, Lexicon and BMS shall agree upon the substance of
information that can be used as a routine reference in the usual


                                       39
<PAGE>   41
course of business to describe the existence and general nature of this
transaction, and Lexicon and BMS may disclose such information without
consulting the other party. The parties may thereafter from time to time
mutually agree on revisions to material to be used as a routine reference, which
revisions shall be submitted by one party for the review and approval of the
other party at least [**] prior to the anticipated use or disclosure of the
revised material, such approval not to be unreasonably withheld. The terms of
this Agreement shall be treated as the Confidential Information of Lexicon and
BMS, and, except to the extent required by applicable law, shall not be
disclosed to anyone (except for the parties' respective employees, consultants,
agents and attorneys assisting in the review and negotiation of this Agreement
who have a need to know the terms of this Agreement) without the written
permission of BMS or Lexicon; provided, that, BMS may disclose to its Corporate
Partners that it is a subscriber to the LexVision and OmniBank Databases, and
provided, further, BMS may disclose the restrictions imposed on it as a
subscriber to the LexVision and OmniBank Databases to the employees, directors
or officers of its Academic Collaborators, under a written confidentiality
agreement, to the extent necessary to enable such Academic Collaborators to
fulfill their obligations to BMS under sponsored research and other similar
agreements by and between such Academic Collaborators and BMS. Any announcements
shall first be agreed upon by the parties in writing and may include the number
of Mutant Mice to be produced hereunder. If either party desires to release a
separate announcement relating to this Agreement, it shall first allow the other
party to approve in writing such proposed announcement; such approval shall not
be unreasonably withheld or delayed.

         13.9 Headings. The captions to the several Articles and Sections hereof
are not a part of this Agreement, but are merely guides or labels to assist in
locating and reading the several Articles and Sections hereof.

         13.10 No Partnership. It is expressly agreed that the relationship
between Lexicon and BMS shall not constitute a partnership, joint venture or
agency. Neither Lexicon nor BMS shall have the authority to make any statements,
representations or commitments of any kind, or to take any action, which shall
be binding on the other, without the prior consent of the other party to do so.

         13.11 Exports. The parties acknowledge that the export of technical
data, materials or products is subject to the exporting party receiving any
necessary export licenses and that the parties cannot be responsible for any
delays attributable to export controls which are beyond the reasonable control
of either party. Lexicon and BMS agree not to export or re-export, directly or
indirectly, any information, technical data, the direct product of such data,
samples or equipment received or generated under this Agreement in violation of
any applicable export control laws or governmental regulations. Lexicon and BMS
agree to obtain similar covenants from their licensees, sublicensees, Corporate
Partners or corporate partners, as the case may be, and contractors with respect
to the subject matter of this Section 13.11.

         13.12 Waiver. The waiver by either party hereto of any right hereunder
or the failure to perform or of a breach by the other party shall not be deemed
a waiver of any other right hereunder or of any other breach or failure by said
other party whether of a similar nature or otherwise.


                                       40
<PAGE>   42
         13.13 Counterparts. This Agreement may be executed in two or more
counterparts, each of which shall be deemed an original, but all of which
together shall constitute one and the same instrument.

                                      * * *

                                       41
<PAGE>   43
         IN WITNESS WHEREOF, the parties have caused their duly authorized
officers to execute and deliver this Agreement as of the Effective Date.

LEXICON GENETICS INCORPORATED


By:                                                  Date:
   --------------------------------------------           ----------------------
     Arthur T. Sands, M.D., Ph.D.
     President and Chief Executive Officer




BRISTOL-MYERS SQUIBB COMPANY


By:                                                  Date:
   --------------------------------------------           ----------------------



                                       42
<PAGE>   44
                                 EXHIBIT 1.11

                              CRE-LOX PATENT RIGHTS


<TABLE>
<CAPTION>
--------------------------- -------------------- ----------------------- ---------------------- ----------------------
                            Application
Country                     Serial No.           Patent No.              Issue Date             Expiry Date
--------------------------- -------------------- ----------------------- ---------------------- ----------------------
<S>                         <C>                  <C>                     <C>                    <C>
USA                                              4,959,317               9/25/90                9/25/2007
--------------------------- -------------------- ----------------------- ---------------------- ----------------------
CANADA                                           1,293,460               12/24/91               12/24/2008
--------------------------- -------------------- ----------------------- ---------------------- ----------------------
IRELAND                                          60421                   7/8/94                 10/6/2006
--------------------------- -------------------- ----------------------- ---------------------- ----------------------
JAPAN                       86/236385
--------------------------- -------------------- ----------------------- ---------------------- ----------------------
EPO                                              0 220 009               2/10/93                10/6/2006
--------------------------- -------------------- ----------------------- ---------------------- ----------------------
AUSTRIA                                          E0085649                2/10/93                10/6/2006
--------------------------- -------------------- ----------------------- ---------------------- ----------------------
BELGIUM                                          0 220 009               2/10/93                10/6/2006
--------------------------- -------------------- ----------------------- ---------------------- ----------------------
FRANCE                                           0 220 009               2/10/93                10/6/2006
--------------------------- -------------------- ----------------------- ---------------------- ----------------------
GREAT BRITAIN                                    0 220 009               2/10/93                10/6/2006
--------------------------- -------------------- ----------------------- ---------------------- ----------------------
GERMANY                                          3687734                 2/10/93                10/6/2006
--------------------------- -------------------- ----------------------- ---------------------- ----------------------
GREECE                                           3007809                 2/10/93                10/6/2006
--------------------------- -------------------- ----------------------- ---------------------- ----------------------
ITALY                                            0 220 009               2/10/93                10/6/2006
--------------------------- -------------------- ----------------------- ---------------------- ----------------------
LUXEMBOURG                                       0 220 009               2/10/93                10/6/2006
--------------------------- -------------------- ----------------------- ---------------------- ----------------------
NETHERLANDS                                      0 220 009               2/10/93                10/6/2006
--------------------------- -------------------- ----------------------- ---------------------- ----------------------
SWEDEN                                           0 220 009               2/10/93                10/6/2006
--------------------------- -------------------- ----------------------- ---------------------- ----------------------
SWITZERLAND                                      0 220 009               2/10/93                10/6/2006
--------------------------- -------------------- ----------------------- ---------------------- ----------------------
</TABLE>

<PAGE>   45
                                  EXHIBIT 1.29


                    DESCRIPTION OF THE LEXVISION(TM) DATABASE

         The LexVision Database is a proprietary relational database comprising
Mutant Mice phenotypic data and associated information. The phenotypic
information and data present in the LexVision Database can be derived from the
study of Mutant Mice produced by the OmniBank method or by Homologous
Recombination.


<PAGE>   46
                                  EXHIBIT 1.34


                 ALLOCATION OF NET SALES IN BUNDLED TRANSACTION

         With respect to Royalty-Bearing Products sold in a Bundled Transaction
in which BMS or any of its Affiliates or Corporate Partners discounts the sales
price of the Royalty-Bearing Products to a greater degree than BMS, its
Affiliates or its Corporate Partners, respectively, generally discounts the
price of its other products to such customer, the amount to be included in Net
Sales of such Royalty-Bearing Products shall be calculated in accordance with
the following formula:


                                   ASP-P x N-P
              NS-P = ---------------------------------------- x BTF
                                    .
                             (SIGMA)m   ASP-p  x N-p
                                     =1      i      i

         Where:

                  NS-P     = Amount allocated to Net Sales of the
                             Royalty-Bearing Product

                  ASP-P    = Average Selling Price (as defined below) per unit,
                             during the applicable period, of the
                             Royalty-Bearing Product when sold alone

                  ASP-p    = Average Selling Price per unit, during the
                       i     applicable period, of each Royalty-Bearing Product
                             or each product other than a Royalty-Bearing
                             Product in the Bundled Transaction when sold alone

                  N-P      = Total number of units of Royalty-Bearing Product
                             included in the Bundled Transaction during the
                             applicable period

                  N-p      = Total number of units (i.e., corresponding to the
                     i       same ASP-pi) of each Royalty-Bearing Product or
                             product other than a Royalty-Bearing Product
                             included in the Bundled Transaction during the
                             applicable period

                       .
                (SIGMA)m   = The sum of the products of the formula ASP-pi o
                        =1   N-pi for each and every Royalty-Bearing Product or
                             product other than a Royalty-Bearing Product
                             included in the Bundled Transaction during the
                             applicable period

                  BTF      = The aggregate amounts paid to BMS for the Bundled
                             Transaction during the applicable period


<PAGE>   47
         The Average Selling Price shall be based on the actual average selling
price of the applicable Royalty-Bearing Product or product other than a
Royalty-Bearing Product, as the case may be, determined for the applicable
period.

         If a Royalty-Bearing Product or other product is not sold separately
and no bona fide list price exists for such Royalty-Bearing Product or other
product, the Parties shall agree upon an imputed bona fide list price for such
Royalty-Bearing Product or other product, and Net Sales with respect thereto
shall be based on such imputed list price.


                                       2
<PAGE>   48
                                  EXHIBIT 1.36


         DESCRIPTION OF THE OMNIBANK(R) LIBRARY AND OMNIBANK(R) DATABASE

         The OmniBank Library is a library of mouse embryonic stem ("ES") cell
clones each containing a gene trap in a single gene. The trapped gene is
identified by a sequence tag referred to as an OST, as defined herein, which
have an average length of approximately 250 base pairs (and no fewer than 100
base pairs). The OSTs identify exons of the trapped genes and are stored in a
searchable database. Once a gene of interest has been identified, the
corresponding ES cell clone, with a specified gene trap mutation, can be
microinjected into host blastocysts to produce knockout mice to study the gene's
function.

         The OmniBank mutations are created using insertional mutagenesis based
on Moloney murine leukemia virus ("MoMuLV") and other vectors. The vectors
deliver a gene trap construct to the ES cells that allows the expression of a
selectable marker gene when the vector has inserted into and trapped exons from
a gene. The gene trap vectors also provide for the semi-automated acquisition of
OSTs.



<PAGE>   49
                                 EXHIBIT 1.50-A

                   SEEK TARGET VALIDATION (S-T-V(TM)) PROGRAM

LEVEL 1 - PRIMARY BIOLOGICAL ANALYSIS

Level 1 analysis is designed to identify primary pathophysiological
perturbations resulting from engineered mutations. Primary phenotypic screens
may include all of the following scientific experiments. Information generated
under Level I analysis will be provided to BMS on a non-exclusive basis.

Level 1 analysis is intended as a first pass screen that may include:

[**]


<PAGE>   50
                                 EXHIBIT 1.50-B


                   SEEK TARGET VALIDATION (S-T-V(TM)) PROGRAM

Level 2 analysis is designed as a continuation of the Level 1 preliminary
analysis of the pathophysiological perturbations resulting from engineered
mutations. Level 2 analysis is focused on organ and physiologic system function
and represents an exhaustive analysis of organismal physiology. Phenotypic
screen analysis under Level 2 may include any or all of the following scientific
experiments depending on the partner's needs. Additional screens and assays to
be conducted by Lexicon can be explored between the parties prior to the
initiation of Level 2 biological experiments.



LEVEL 2 - ORGAN AND PHYSIOLOGIC SYSTEMS ANALYSIS


o        [**]



LEVEL 3 - PATHWAY DISCOVERY AND ANALYSIS


Level 3 analysis is designed as a continuation of the Level 1 and Level 2
analysis of the pathophysiological perturbations resulting from engineered
mutations. Level 3 analysis is designed to define biochemical pathways, identify
new drug targets and to define the biochemical mechanism of the pathophysiology
identified in the Level 1 and Level 2 analysis. [**]



<PAGE>   51
                                  EXHIBIT 1.53


                        SUMMARY OF BASF-OWNED PATENTS AND
                   PATENT APPLICATIONS CLAIMING THE TET-SYSTEM

FORWARD SYSTEM (REPRESSOR SYSTEM):

1.       U.S. Patent #5,464,758, issued November 7, 1995.
         Tight Control of Gene Expression in Eukaryotic Cells by Tetracycline
         Responsive Promoters, by Bujard and Gossen.

2.       June 14, 1993. Abandoned U.S. Patent Application.
         Tight Control of Gene Expression in Eukaryotic Cells by Tetracycline
         Responsive Promoters, by Bujard, Gossen, Salfeld and Voss. BBI-013;
         BBC-003.

3.       U.S. Patent #5,650,298, issued July 22, 1997.
         Tight Control of Gene Expression in Eukaryotic Cells by Tetracycline
         Responsive Promoters, by Bujard, Gossen, Salfeld and Voss.

4.       June 14, 1994. Abandoned PCT Patent Application.
         Tight Control of Gene Expression in Eukaryotic Cells by Tetracycline
         Responsive Promoters, by Bujard, Gossen, Salfeld and Voss. BBI-013CPPC;
         BBC-003B.
         Converted to National Applications as follows:
         Europe - BBI-013CPEP, BBC003B-EP
         Australia - Patent #684524, issued May 14, 1998
         Canada - BBI-013CPCA, BBC003B-CA
         Japan - BBI-013CPJP, BBC003B-JP
         Hong Kong - BBI-013CPHK, BBC003B-HK

5.       June 14, 1994. Pending Mexican Patent Application.
         Tight Control of Gene Expression in Eukaryotic Cells by Tetracycline
         Responsive Promoters, by Bujard, Gossen, Salfeld and Voss. BBI-013CPMX;
         BBC-003C.

6.       U.S. Patent #5,859,310, issued January 12, 1999.
         Mice Transgenic for a Tetracycline-Controlled Transcriptional
         Activator, by Bujard, Gossen, Salfeld and Voss.

7.       U.S. Patent #5,888,981, issued March 30, 1999.
         Methods for Regulating Gene Expression, by Bujard, Gossen, Salfeld and
         Voss.

8.       U.S. Patent #5,922,927, issued July 13, 1999.
         Methods for Producing Tetracycline-Regulated Transgenic Mice by Bujard,
         Gossen, Salfeld and Voss.

<PAGE>   52
9.       September 29, 1998. Pending U.S. Patent Application.
         Transgenic Organisms Having Tetracycline-Regulated Transcriptional
         Regulatory Systems, by Bujard, Gossen, Salfeld and Voss. BBI-013C2CN;
         BBC-003G

10.      September 29, 1998. Pending U.S. Patent Application.
         Tetracycline-Regulated Transcriptional Activator Fusion Proteins, by
         Bujard and Gossen. BBI-013C3CN; BBC-003H.

11.      March 30, 1999. Pending U.S. Patent Application.
         Methods for Regulating Gene Expression, by Bujard, Gossen, Salfeld and
         Voss. BBI-013C3CN2; BBC-0031.

REVERSE SYSTEM (ACTIVATION SYSTEM):

12.      July 1, 1994. Abandoned U.S. Patent Application.
         Tetracycline-Inducible Transcriptional Activator and
         Tetracycline-Regulated Transcription Units, by Bujard and Gossen.
         BBI-009; BBC-009.

13.      U.S. Patent #5,654,168, issued August 5, 1997.
         Tetracycline-Inducible Transcriptional Activator and
         Tetracycline-Regulated Transcriptional Units, by Bujard and Gossen.

14.      U.S. Patent #5,789,156, issued August 4, 1998.
         Tetracycline-Regulated Transcriptional Inhibitors, by Bujard and
         Gossen.

15.      June 7, 1995. Pending U.S. Patent Application.
         Animals Transgenic for a Tetracycline-Inducible Transcriptional
         Activator, by Bujard and Gossen. BBI-009CP3; BBC-009C.

16.      U.S. Patent #5,866,755, issued February 2, 1999.
         Animals Transgenic for a Tetracycline-Regulated Transcriptional
         Inhibitor, by Bujard and Gossen. BBI-009CP4; BBC-009D.

17.      June 7, 1995. Pending U.S. Patent Application.
         Methods for Regulating Gene Expression, by Bujard and Gossen.
         BBI-009CP5; BBC-009E.

18.      U.S. Patent #5,814,618, issued September 29, 1998.
         Methods for Regulating Gene Expression, by Bujard and Gossen.

19.      U.S. Patent #5,589,362, issued December 31, 1996.
         Tetracycline-Regulated Transcriptional Modulators with Altered DNA
         Binding Specificities, by Bujard, Gossen, Hillen, Helbl and
         Schnappinger.

<PAGE>   53
20.      June 29, 1995. Abandoned PCT Application.
         Tetracycline-Regulated Transcriptional Modulators, by Bujard and
         Gossen. BBI009C2PC; BBC-009H.
         Converted to National Applications as follows:
         Europe - BBT-009C2EP; BBC-009H-EP
         Australia - BBI-009C2AU; BBC-009H-AU
         Canada - BBI-009C2CA; BBC-009H-CA
         Japan - BBI-009C2JP; BBC-009H-JP
         Finland - BBI-009C2F1; BBC-009H-FI
         Norway - BBI-009C2NO; BBC-009H-NO S.
         Korea - BBI-009C2KR; BBC-009H-KR
         China - BBI-009C2C1; BBC-009H-CI
         Singapore - BBI-009C2SG; BBC-009H-SG

21.      September 28, 1998. Pending U.S. Patent Application.
         Transgenic Organisms Having Tetracycline-Regulated Transcriptional
         Regulatory Systems (As Amended), by Bujard and Gossen. BBI-009C3CN;
         BBC-009K

22.      February 2, 1999. Pending U.S. Patent Application.
         Animals Transgenic for a Tetracycline-Regulated Transcriptional
         Inhibitor, by Bujard and Gossen. BBI-009C6CN; BBC-009J.

23.      September 28, 1998. Pending U.S. Patent Application.
         Tetracycline-Inducible Transcriptional Activator and Inhibitor Fusion
         Proteins (As Amended), by Bujard and Gossen. BBI-009C4CN; BBC-009L.


<PAGE>   54
                                   EXHIBIT 2.1


                   STEERING COMMITTEE AND PROJECT COORDINATORS

BMS Steering Committee Representatives:

1.       Mark Cockett, Initial Chairperson
2.       David Bol
3.       Lucie Bruijn

BMS Project Coordinator: Kevin FitzGerald

Lexicon Steering Committee Representatives:

1.       Jim Piggott, Initial Secretary
2.       Brian Zambrowicz
3.       David Powell

Lexicon Project Coordinator: Cori Mossel


<PAGE>   55
                                  EXHIBIT 3.1.4


                            NOTICE AND ACKNOWLEDGMENT

         This Notice and Acknowledgment Agreement ("Agreement"), effective as of
the date set forth below (the "Effective Date"), is between BASF Bioresearch
Corporation, a Delaware corporation having a place of business at 100 Research
Drive, Worcester, MA 01605-4314 ("BBC") and Bristol-Myers Squibb Company, a
Delaware corporation having a place of business at Route 206 and Province Line
Road, Princeton, NJ 08543-4000 ("Recipient").


         WHEREAS, BBC entered into an agreement with Lexicon Genetics
Incorporated, a Delaware corporation having an office and place of business at
4000 Research Forest Drive, The Woodlands, Texas 77381-4287 (the "Licensee")
relating to a non-exclusive license to generate a line of knock-out mice (the
"Licensed Product") utilizing the tetracycline controllable expression systems
(the "TET-System").

         WHEREAS, the TET-System is covered under various patents included in
the exhibit that is attached hereto and made a part of this Agreement (the
"Patent Rights"), which have been assigned to BASF Aktiengesellschaft (itself
and/or its affiliate(s)).

         WHEREAS, Recipient now wishes Licensee to make Licensed Product(s) for
Recipient's and/or its affiliates' use under the collaboration agreement between
Recipient and Licensee dated as of __________, 2000.

         NOW, THEREFORE, in consideration for the acknowledgment below, BBC
grants Licensee the authority, under the Patent Rights, solely to transfer
Licensed Product to Recipient (the "Authorization") under the following
conditions:

1.       Recipient acknowledges that:

         A.       The TET-System is experimental in nature. BBC MAKES NO
                  WARRANTIES, EXPRESS OR IMPLIED OF ANY KIND, AND HEREBY
                  DISCLAIMS ANY WARRANTIES, REPRESENTATIONS OR GUARANTEES OF ANY
                  KIND AS TO THE TET-SYSTEM, AND/OR ANY PATENTS OR PRODUCTS
                  RELATED THERETO.

         B.       Recipient's Authorization to utilize the Licensed Product is
                  only valid for internal research and discovery purposes.

         C.       Except as otherwise stated in this Agreement, the
                  Authorization can not be assigned or otherwise transferred to
                  any third party without the prior written consent of BBC. Any
                  such attempted assignment shall be considered void.

         D.       Recipient must obtain the approval of BBC prior to utilizing
                  the TET-System in collaboration with any third party. A
                  commercial entity would be required to obtain a commercial
                  license from BBC and a not-for-profit entity would be required
                  to execute a notice and acknowledgement agreement from BBC.

<PAGE>   56
         E.       Development by Recipient leading to regulatory approval is not
                  allowed under this Authorization. In the event Recipient
                  wishes to engage in such development or commercialization
                  activities, Recipient and BBC shall negotiate, diligently and
                  in good faith, the terms of a commercially reasonable license
                  that will permit Recipient to do so.

         F.       Transfer of reagents, including, but not limited to, cell
                  lines, plasmids, vectors, receptors, promoters, embryos,
                  animals, chemical entities, pharmaceuticals, and other
                  products or agents which incorporate the TET-System or a
                  component of the TET-System ("Reagents") to any other
                  not-for-profit or commercial entity is not permitted without
                  the prior written approval of BBC.

2.       Recipient shall be responsible for and shall indemnify and hold
         harmless BBC and its affiliates, its officers, agents and employees,
         from and against any and all claims for or on account of, any injury to
         or death of persons, or damage to property, including but not by way of
         limitation, damage to property of Recipient or others, arising out of
         or in any way occurring directly or indirectly in connection with
         Recipient's use of the TET-System and the Patent Rights and Recipient
         shall at its sole expense defend any and all actions based thereon.

3.       Recipient further acknowledges that Recipient shall have no rights in
         equity or in law against BBC for any claims or any other cause of
         action arising out of this Agreement. BBC shall have the right at any
         time to terminate the rights granted to Recipient pursuant to this
         Agreement in the event Recipient materially breaches any provision
         hereunder.

         In consideration for the rights granted pursuant to the preceding
paragraphs, Recipient hereby acknowledges and agrees to comply with the
foregoing conditions.


                                     BASF BIORESEARCH CORPORATION

                                     By:
                                             -----------------------------------
                                     Name:
                                             -----------------------------------
                                     Title:
                                             -----------------------------------
                                     Date:
                                             -----------------------------------

                                     BRISTOL-MYERS SQUIBB COMPANY

                                     By:
                                             -----------------------------------
                                     Name:
                                             -----------------------------------
                                     Title:
                                             -----------------------------------
                                     Date:
                                             -----------------------------------


<PAGE>   57
                        SUMMARY OF BASF-OWNED PATENTS AND
                   PATENT APPLICATIONS CLAIMING THE TET-SYSTEM

FORWARD SYSTEM (REPRESSOR SYSTEM):

1.       U.S. Patent #5,464,758, issued November 7, 1995.
         Tight Control of Gene Expression in Eukaryotic Cells by Tetracycline
         Responsive Promoters, by Bujard and Gossen.

2.       June 14, 1993. Abandoned U.S. Patent Application.
         Tight Control of Gene Expression in Eukaryotic Cells by Tetracycline
         Responsive Promoters, by Bujard, Gossen, Salfeld and Voss. BBI-013;
         BBC-003.

3.       U.S. Patent #5,650,298, issued July 22, 1997.
         Tight Control of Gene Expression in Eukaryotic Cells by Tetracycline
         Responsive Promoters, by Bujard, Gossen, Salfeld and Voss.

4.       June 14, 1994. Abandoned PCT Patent Application.
         Tight Control of Gene Expression in Eukaryotic Cells by Tetracycline
         ResponsivePromoters, by Bujard, Gossen, Salfeld and Voss. BBI-013CPPC;
         BBC-003B.
         Converted to National Applications as follows:
         Europe - BBI-013CPEP, BBC003B-EP
         Australia - Patent #684524, issued May 14, 1998
         Canada - BBI-013CPCA, BBC003B-CA
         Japan - BBI-013CPJP, BBC003B-JP
         Hong Kong - BBI-013CPHK, BBC003B-HK

5.       June 14, 1994. Pending Mexican Patent Application.
         Tight Control of Gene Expression in Eukaryotic Cells by Tetracycline
         Responsive Promoters, by Bujard, Gossen, Salfeld and Voss. BBI-013CPMX;
         BBC-003C.

6.       U.S. Patent #5,859,310, issued January 12, 1999.
         Mice Transgenic for a Tetracycline-Controlled Transcriptional
         Activator, by Bujard, Gossen, Salfeld and Voss.

7.       U.S. Patent #5,888,981, issued March 30, 1999.
         Methods for Regulating Gene Expression, by Bujard, Gossen, Salfeld and
         Voss.

8.       U.S. Patent #5,922,927, issued July 13, 1999.
         Methods for Producing Tetracycline-Regulated Transgenic Mice by Bujard,
         Gossen, Salfeld and Voss.

9.       September 29, 1998. Pending U.S. Patent Application.
         Transgenic Organisms Having Tetracycline-Regulated Transcriptional
         Regulatory Systems, by Bujard, Gossen, Salfeld and Voss. BBI-013C2CN;
         BBC-003G

10.      September 29, 1998. Pending U.S. Patent Application.
         Tetracycline-Regulated Transcriptional Activator Fusion Proteins, by
         Bujard and Gossen. BBI-013C3CN; BBC-003H.

<PAGE>   58
11.      March 30, 1999. Pending U.S. Patent Application.
         Methods for Regulating Gene Expression, by Bujard, Gossen, Salfeld and
         Voss. BBI-013C3CN2; BBC-0031.

REVERSE SYSTEM (ACTIVATION SYSTEM):

12.      July 1, 1994. Abandoned U.S. Patent Application.
         Tetracycline-Inducible Transcriptional Activator and
         Tetracycline-Regulated Transcription Units, by Bujard and Gossen.
         BBI-009; BBC-009.

13.      U.S. Patent #5,654,168, issued August 5, 1997.
         Tetracycline-Inducible Transcriptional Activator and
         Tetracycline-Regulated Transcriptional Units, by Bujard and Gossen.

14.      U.S. Patent #5,789,156, issued August 4, 1998.
         Tetracycline-Regulated Transcriptional Inhibitors, by Bujard and
         Gossen.

15.      June 7, 1995. Pending U.S. Patent Application.
         Animals Transgenic for a Tetracycline-Inducible Transcriptional
         Activator, by Bujard and Gossen. BBI-009CP3; BBC-009C.

16.      U.S. Patent #5,866,755, issued February 2, 1999.
         Animals Transgenic for a Tetracycline-Regulated Transcriptional
         Inhibitor, by Bujard and Gossen. BBI-009CP4; BBC-009D.

17.      June 7, 1995. Pending U.S. Patent Application.
         Methods for Regulating Gene Expression, by Bujard and Gossen.
         BBI-009CP5; BBC-009E.

18.      U.S. Patent #5,814,618, issued September 29, 1998.
         Methods for Regulating Gene Expression, by Bujard and Gossen.

19.      U.S. Patent #5,589,362, issued December 31, 1996.
         Tetracycline-Regulated Transcriptional Modulators with Altered DNA
         Binding Specificities, by Bujard, Gossen, Hillen, Helbl and
         Schnappinger.

20.      June 29, 1995. Abandoned PCT Application.
         Tetracycline-Regulated Transcriptional Modulators, by Bujard and
         Gossen. BBI009C2PC; BBC-009H. Converted to National Applications as
         follows:
         Europe - BBT-009C2EP; BBC-009H-EP
         Australia - BBI-009C2AU; BBC-009H-AU
         Canada - BBI-009C2CA; BBC-009H-CA
         Japan - BBI-009C2JP; BBC-009H-JP
         Finland - BBI-009C2F1; BBC-009H-FI
         Norway - BBI-009C2NO; BBC-009H-NO S.
         Korea - BBI-009C2KR; BBC-009H-KR
         China - BBI-009C2C1; BBC-009H-CI
         Singapore - BBI-009C2SG; BBC-009H-SG

21.      September 28, 1998. Pending U.S. Patent Application.
         Transgenic Organisms Having Tetracycline-Regulated Transcriptional
         Regulatory Systems (As Amended), by Bujard and Gossen. BBI-009C3CN;
         BBC-009K

<PAGE>   59
22.      February 2, 1999. Pending U.S. Patent Application.
         Animals Transgenic for a Tetracycline-Regulated Transcriptional
         Inhibitor, by Bujard and Gossen. BBI-009C6CN; BBC-009J.

23.      September 28, 1998. Pending U.S. Patent Application.
         Tetracycline-Inducible Transcriptional Activator and Inhibitor Fusion
         Proteins (As Amended), by Bujard and Gossen. BBI-009C4CN; BBC-009L.



<PAGE>   60
                                  EXHIBIT 3.5-A


         MATERIAL TRANSFER AGREEMENT BETWEEN BMS AND A CORPORATE PARTNER
                    OR ACADEMIC COLLABORATOR FOR TRANSFER OF
                 NON-CRE-LOX MUTANT MICE PURSUANT TO SECTION 3.5

         Bristol-Myers Squibb Company ("BMS") is willing to provide Material
(defined below) to ___________________ ("Investigator") of _____________________
("[Institution/Company]") (hereinafter collectively "Recipient") solely for the
internal research purposes as described below, under the following terms.

         1. Upon execution of this agreement, BMS shall provide to Investigator
samples of the Material. "Material" as used herein means _______________________

________________________________________________________________________________

________________________________________________________________________________

________________________________________________________________________________
[SPECIFY THE NON-CRE-LOX MOUSE (MOUSE OR CELL LINE)] or any cell line or progeny
derived directly or therefrom.

         2. The Material will be used by Recipient solely in conducting research
under the supervision of Investigator in support of a collaborative research
project with BMS. The Material will be used solely within Recipient's internal
facilities and will not be transferred to any third party. The Material will be
used solely for internal research purposes and for no other purpose. In no event
will the Material be used in, or used in the manufacture of, a product for sale
(or lease or other transfer of a product for consideration).

         3. Recipient acknowledges the Material or its parent or progenitor has
been obtained by BMS from Lexicon Genetics Incorporated ("Lexicon"). Recipient
shall acknowledge in any publication or presentation of results of research
performed using the Material that the Material or its parent or progenitor was
obtained from Lexicon.

         4. Recipient will indemnify, defend and hold harmless BMS and Lexicon
from and against any and all claims, losses, liabilities and damages arising
from or related to the Recipient's use of the Material. THE MATERIAL IS PROVIDED
TO RECIPIENT WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED, INCLUDING ANY WARRANTY OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE OR THAT THE USE OF THE
MATERIAL WILL NOT INFRINGE ANY PATENT OR OTHER PROPRIETARY RIGHTS OF OTHERS.

         5. Recipient agrees that any person utilizing the Material within
Institution will be advised of and shall be subject to the conditions of this
Agreement.

         6. BMS represents that it has obtained prior written permission from
Lexicon to enter into this Agreement. The parties agree to the foregoing and
have caused this Agreement to be executed by their duly authorized
representatives.

<PAGE>   61
                                                BRISTOL-MYERS SQUIBB COMPANY

                                                By:
                                                   -----------------------------
                                                Title:
                                                      --------------------------
                                                Date:
                                                     ---------------------------


[Name of Institution/Company]

By:
   -----------------------------------------    --------------------------------
(signature of authorized representative)        (signature of Investigator)

Printed Name:                                   Printed Name:
             -------------------------------                 -------------------

Title:
      --------------------------------------

Date:                                           Date:
     ---------------------------------------         ---------------------------


<PAGE>   62
                                 EXHIBIT 3.5-B


         MATERIAL TRANSFER AGREEMENT BETWEEN BMS AND A CORPORATE PARTNER
                  OR ACADEMIC COLLABORATOR FOR LOX-MUTANT MICE
                      PURSUANT TO SECTIONS 3.1.3(b) AND 3.5


         Bristol-Myers Squibb Company ("BMS") is willing to provide Material
(defined below) to _______________________ ("Investigator") of
_________________________________ ("[Institution/Company]") (hereinafter
collectively "Recipient") solely for the internal research purposes as described
below, under the following terms.

         1. Upon execution of this agreement, BMS shall provide to Investigator
samples of the Material. "Material" as used herein means _______________________

________________________________________________________________________________

________________________________________________________________________________

________________________________________________________________________________
[SPECIFY THE LOX MOUSE (MOUSE OR CELL LINE) OR ANY CELL LINE OR PROGENY
CONTAINING LOX DNA DERIVED THEREFROM] and any cell line or progeny containing
lox DNA or cre DNA derived directly or indirectly therefrom.

         2.1. The Material will be used by Recipient solely in conducting
research under the supervision of Investigator in support of the collaborative
research project with BMS. The material will be used solely within Recipient's
internal facilities will not be transferred to any third party. The Material
will be used solely for internal research purposes and for no other purpose. In
no event will the Material be used in, or used in the manufacture of, a product
for sale (or lease or other transfer of a product for consideration).

         2.2. Recipient further agrees that it will not manipulate the genetic
information at any loxP site in the Material using cre recombinase, except as
may be permitted as set forth in Section 4 below. For example and without
limitation, Recipient shall not cross-breed any mouse containing loxP with a
mouse expressing cre recombinase.

         3. The Material is covered by the claims of U.S. patent number
4,959,317, which is assigned to DuPont Pharmaceuticals Company. The Material or
its parent or progenitor has been obtained by BMS from Lexicon Genetics
Incorporated ("Lexicon") which has licensed certain rights under U.S. patent
number 4,959,317 from DuPont Pharmaceuticals Company, including the right to
permit BMS to extend to third parties the limited rights to practice under U.S.
patent number 4,959,317 as set forth herein. Except as specifically and
expressly set forth herein, no right is granted by DuPont Pharmaceuticals
Company to practice inventions claimed under U.S. patent number 4,959,317.
Recipient shall acknowledge in any publication or presentation of results of
research performed using the Material that the Material or its parent or
progenitor was obtained from Lexicon.

         4. In the event that Recipient has entered into a license agreement
with DuPont Pharmaceuticals Company, The DuPont Merck Pharmaceutical Company or
E.I. DuPont de

<PAGE>   63
Nemours and Company granting rights under U.S. patent number 4,959,317, then the
use of the Material shall be subject to the terms of such license agreement,
provided however, that the use of the Material shall be subject to any further
restrictions on the use of the Material as set forth herein.

         5. With respect to any further license rights under U.S. patent number
4,959,317, Recipient should contact:

                  Vice President, Product Planning & Acquisition
                  DuPont Pharmaceuticals Company
                  974 Centre Road, Chestnut Run Plaza, WR722
                  Wilmington, Delaware 19807-2802
                  (fax number: 302-922-3040)

         6. Recipient will indemnify, defend and hold harmless BMS and Lexicon
from and against any and all claims, losses, liabilities and damages arising
from or related to the Recipient's use of the Material. THE MATERIAL IS PROVIDED
TO RECIPIENT WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED, INCLUDING ANY WARRANTY OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE OR THAT THE USE OF THE
MATERIAL WILL NOT INFRINGE ANY PATENT OR OTHER PROPRIETARY RIGHTS OF OTHERS.

         7. Recipient agrees that any person utilizing the Material within
[Institution/Company] will be advised of and shall be subject to the conditions
of this Agreement.

         8. BMS represents that it has obtained prior written permission from
Lexicon to enter into this Agreement.

<PAGE>   64
         The parties agree to the foregoing and have caused this Agreement to be
executed by their duly authorized representatives.

                                                BRISTOL-MYERS SQUIBB COMPANY

                                                By:
                                                   -----------------------------
                                                Title:
                                                      --------------------------
                                                Date:
                                                     ---------------------------


[Name of Institution/Company]

By:
   -----------------------------------------    --------------------------------
(signature of authorized representative)        (signature of Investigator)

Printed Name:                                   Printed Name:
             -------------------------------                 -------------------

Title:
      --------------------------------------

Date:                                           Date:
     ---------------------------------------         ---------------------------


<PAGE>   65
                                  EXHIBIT 4.4.1


                   FORM FOR DESIGNATION OF LEXVISION PROJECTS

DATE

Lexicon Genetics Incorporated
Attn: LexVision Project Manager
4000 Research Forest Drive
The Woodlands, TX  77381

Subject:  LexVision Project Initiation Request

Dear ______:

This letter is to provide notice to Lexicon Genetics Incorporated ("Lexicon") of
the request by Bristol-Myers Squibb Company ("BMS"), under Section 4.4.1 of the
LexVision Database and Collaboration Agreement between Lexicon and BMS dated
________________ (the "Agreement"), that Lexicon initiate the
Seek-Target-Validation Project specified below for inclusion in the LexVision
Database, subject to the terms and conditions of the Agreement.

The Seek-Target-Validation Project to be initiated is described as follows:

     o    Gene Name:

     o    Method of Development:
[**]
     o    Mouse cDNA sequence (if known):

             (Provide as an electronic file or on diskette if necessary)

     o    Is the genomic structure (i.e., intron/exon boundaries, size of
          introns, position of initiation codon, etc.) known for this gene?

             (Provide as an electronic file or on diskette if necessary)

     o    Description of desired mutation (i.e., which specific sequences to
          delete):


Sincerely,

Name: ___________________________
BMS Project Coordinator

Title: ____________________________

<PAGE>   66
                                  EXHIBIT 5.2-A


                 REQUIREMENTS FOR THE GENERATION OF MUTANT MICE

A.       Requirements for the Generation of Mutant Mice.

         1.       Mutant Mice made using the OmniBank Method.

                  Identification of the OST reference number from the OmniBank
                  Database.

         2.       Mutant Mice made using Homologous Recombination.

[**]B.   Specifications for Mutant Mice - Absence of Specific Pathogens.


         Lexicon will maintain the hygiene of its animal facility from which the
Mutant Mice derive in a specific pathogen free state according to standards in
the industry with screens for the following viral and bacterial pathogens using
sentinel mice. Lexicon may alter the list of screened pathogens listed below
according to generally accepted changes in industry standards: [**]

C.       Specifications for Tissue Culture Monitoring.

         Lexicon randomly tests tissue culture media and reagents for mycoplasma
         on a monthly basis, and for a variety of other pathogens, using the
         industry MAP procedures, on a quarterly basis.



<PAGE>   67
                                  EXHIBIT 5.2-B

   REQUEST FOR DELIVERY OF LEXVISION MUTANT MOUSE UNDER SECTION 5.2(a) OR (b)

DATE

Lexicon Genetics Incorporated
Attn: LexVision Project Coordinator
4000 Research Forest Drive
The Woodlands, TX  77381

Subject: Request for Delivery of LexVision Mutant Mice

Dear ______:

This letter is to provide notice to Lexicon Genetics Incorporated ("Lexicon") of
the request by Bristol Myers Squibb Company ("BMS"), under Section(s) 5.2(a)
and/or 5.2(b), as the case may be, of the LexVision Database and Collaboration
Agreement between Lexicon and BMS dated ________, 2000 (the "Agreement"), for
the delivery to BMS of the LexVision Mutant Mice [**] specified below, subject
to the terms and conditions of the Agreement.

     o    LexVision Accession No.:

     o    Gene Name:


    [ ]   In addition to receiving live mice from the line of Mutant Mice
          specified above, BMS requests, under Section 5.2(b) of the Agreement,
          [**].

    [ ]   In lieu of receiving live mice from the line of Mutant Mice
          specified above, BMS requests, under Section 5.2(b) of the Agreement,
          [**].

    [ ]   The "Request for Shipping Information" form has been completed and
          attached.

    [ ]   [**]


Sincerely,

Name: ___________________________
BMS Project Coordinator

Title: ____________________________

<PAGE>   68
================================================================================
                              FOR LEXICON USE ONLY


<TABLE>
<CAPTION>
-------------------- -------------------- ----------------------------- ------------------------
 REQUEST NO.:                              PROJECT I.D.:
-------------------- ---------------------------------------------------------------------------
<S>                  <C>
 METHOD:              [ ]  Stock        [ ]  Microinjection       [ ]  In Vitro Fertilization
-------------------- ---------------------------------------------------------------------------
</TABLE>


DATE OF COMPLETION: ________________    PROJECT MANAGER: ______________________


<PAGE>   69
          REQUEST FOR DEVELOPMENT OF MUTANT MOUSE UNDER SECTION 5.2(c)


DATE

Lexicon Genetics Incorporated
Attention:  LexVision Project Coordinator
4000 Research Forest Drive
The Woodlands, TX 77381

Dear ____:

This letter is to provide notice to Lexicon Genetics Incorporated ("Lexicon") of
the request by Bristol Myers Squibb Company ("BMS") that a Mutant Mouse with a
Selected Mutation in the murine gene specified below be developed for BMS under
Section 5.2(c) of the LexVision Database and Collaboration Agreement between
Lexicon and BMS dated ________, 2000 (the "Agreement"), subject to the terms and
conditions of the Agreement.


The Mutant Mouse Project to be initiated is described as follows:

Gene or project name: __________      GenBank Accession Number (if any): _______

Mouse cDNA sequence (if known):
(Attach additional sheets or electronic file if necessary)




Genomic structure (if known):
(Attach additional sheets or electronic file if necessary)




Type of mutation preferred:




[ ]      [**]


Sincerely,

Name: ___________________________
BMS Project Coordinator

Title: ____________________________


<PAGE>   70
                                   EXHIBIT 5.5


           STANDARD LEXICON MUTANT MOUSE SHIPPING AND RECEIVING REPORT

                        REQUEST FOR SHIPPING INFORMATION

The following information is required to process the shipment of your mutant
mice. In order to prevent any delays in shipping your mice, please complete this
form in full and submit it to Lexicon as soon as possible. Omission of any
information could delay your shipment. **Lexicon will not ship any mice without
explicit authorization from the receiving institution's veterinarian.**


      SHIPPING & RECEIVING CLERK:
                                   ---------------------------------------------
               Clerk's Telephone:
                                   ---------------------------------------------
                     Clerk's Fax:
                                   ---------------------------------------------
                  Clerk's E-mail:
                                   ---------------------------------------------

                                   ---------------------------------------------
                     INSTITUTION:
                                   ---------------------------------------------
                SHIPPING ADDRESS:
                           Street
                                   ---------------------------------------------
                         Building
                                   ---------------------------------------------
                         Room No.
                                   ---------------------------------------------
         City, State and Zip Code
                                   ---------------------------------------------
                          Country
                                   ---------------------------------------------

      INSTITUTION'S VETERINARIAN:
                                   ---------------------------------------------
        Veterinarian's Telephone:
                                   ---------------------------------------------
              Veterinarian's Fax:
                                   ---------------------------------------------
           Veterinarian's E-mail:
                                   ---------------------------------------------

          RECEIVING INVESTIGATOR:
                                   ---------------------------------------------
        Investigator's Telephone:
                                   ---------------------------------------------
              Investigator's Fax:
                                   ---------------------------------------------
           Investigator's E-mail:
                                   ---------------------------------------------


SHIPPING & DELIVERY REQUIREMENTS (DOMESTIC AND INTERNATIONAL):

Lexicon will use the information you provide above to exchange the required
health documents with the Institution's Veterinarian and schedule the shipment.
The shipping costs have been included in the overall project cost.

INTERNATIONAL ONLY:  Lexicon will contact the Receiving Veterinarian
                     approximately 3 weeks prior to delivery. At this time,
                     Lexicon will provide serology reports and request an Import
                     Permit from the Receiving Veterinarian. An Import Permit is
                     required in most countries and must be provided to Lexicon
                     in English and the predominant language of the receiving
                     country. Lexicon will notify Receiving Institution and
                     Animal Port Houston when mice are ready to be shipped. Upon
                     arrival in the destination country, the Receiving
                     Institution is responsible for arranging delivery from the
                     airport to Receiving Institution. Animal Port Houston will
                     contact the Receiving Institution and provide flight
                     information.


PLEASE RETURN THIS FORM TO:  LexVision(TM) Project Manager
                             Lexicon Genetics Incorporated
                             4000 Research Forest Drive
                             The Woodlands, TX 77381
                             Tel: 281-364-0100
                             Fax: 281-296-0749
                             E-mail: [email protected] or [email protected]


<PAGE>   71
                                 EXHIBIT 10.1.7


                            SUMMARY OF MGRI AGREEMENT

In April 1997, Lexicon entered into an agreement with the Merck Genome Research
Institute ("MGRI"), a not-for-profit institution, pursuant to which MGRI agreed
to pay Lexicon $8.0 million over five years for the development of 150 lines of
mutant mice from OmniBank. The lines of mice generated for MGRI are selected by
a mutation selection committee comprised of selected scientists from academic
institutions and industry. Under the agreement, a non-profit institution
designated by MGRI (an "NFP") will distribute the mice at cost to the biomedical
research community to support research. MGRI has exclusive rights to the 150
lines of mice selected by the selection committee, provided that Lexicon retains
rights to use the mice for its own research programs and, subsequent to the time
that a given line of mice are made available by an NFP, to provide mice from
such line of mice to Lexicon collaborators; and provided, further, that MGRI's
rights of exclusivity to mice made from an OmniBank ES cell do not limit
Lexicon's right to make or sell mice made by Homologous Recombination.


<PAGE>   72
                                 EXHIBIT 10.1.15


                         ANIMAL CARE AND USE GUIDELINES

     To satisfy BMS requirements for assuring appropriate care and use of
animals used by Lexicon under this Agreement, Lexicon agrees as follows:

A.   All animal test methods or other procedures used by Lexicon hereunder must
     be reviewed and approved by a BMS Animal Care and Use Committee (ACUC) or
     by another appropriate reviewing body mutually acceptable to BMS and the
     Lexicon, such acceptance by BMS not to be unreasonably withheld or delayed
     (for facilities located within the United States Lexicon's ACUC is
     presumptively acceptable to BMS). Suitable documents for review include:
     animal test methods, written descriptions of animal use portions of
     activities or animal use protocols, etc. For activities reviewed and
     approved by a non-BMS reviewing body, Lexicon shall provide to BMS the
     following for its review, comment, and, if necessary, recommended changes
     in procedures or methods approved by the non-BMS reviewing body that would
     be reasonably acceptable to BMS:

     (1)  A copy of the specific animal test method or animal use protocol to be
          used by Lexicon for the animal work under this Agreement; and

     (2)  Documentation of the non-BMS reviewing body approval of such use.

B.   Within 30 days after Lexicon obtains accreditation by the American
     Association for the Accreditation of Laboratory Animal Care (AAALAC),
     Lexicon will provide to BMS a copy of the Accreditation Certificate or
     Accreditation Letter evidencing such accreditation. Lexicon will use all
     commercially reasonable efforts to finalize its application for AAALAC
     accreditation by the end of August 2001. If Lexicon is unable to meet this
     timeline using all commercially reasonable efforts, Lexicon shall promptly
     notify BMS and inform BMS of the actions Lexicon is taking to promptly
     complete and submit its application to obtain AAALAC accreditation.
     Following its receipt of AAALAC accreditation, Lexicon will use all
     commercially reasonable efforts to maintain such accreditation during the
     remainder of the Collaboration Term. If at any time during the
     Collaboration Term, AAALAC revokes Lexicon's accreditation, Lexicon will
     immediately notify BMS of such event and will thereafter comply with the
     criteria in (C) below.

C.   If Lexicon is not AAALAC accredited or loses its AAALAC accreditation at
     any time during the Collaboration Term, Lexicon will provide to BMS, at
     such time(s) as BMS may request, documented evidence satisfactory to BMS of
     proper animal care and use in connection with the work under this
     Agreement, which evidence shall include without limitation the following:

     (1)  For facilities located within the United States:

<PAGE>   73
          (a)  Copies of the most recent two USDA inspection reports, indicating
               no exceptions or deficiencies unacceptable to BMS, if and after
               Lexicon's facilities become subject to the jurisdiction of the
               USDA;

          (b)  Copies of the two most recent ACUC semi-annual inspection
               reports/reviews for the facilities at which the work under this
               Agreement will be conducted, indicating no exceptions or
               deficiencies unacceptable to BMS; and

          (c)  A copy of Lexicon's NIH Assurance statement and number, if
               applicable.

     (2)  For facilities located outside the United States:

          (a)  Copies of such local accreditation and/or satisfactory local
               governmental inspection reports as BMS may require; and

          (b)  Evidence of compliance with such other minimum standards as may
               be established by BMS.

         Lexicon shall notify BMS promptly of any change in the status of any
         accreditation or inspection report provided to BMS hereunder.

D.   Lexicon represents that it will use all commercially reasonable efforts to
     establish and maintain appropriate written procedures or guidelines for the
     humane care and treatment of all animals to be used in the work under this
     Agreement.

E.   Lexicon agrees that, upon reasonable advance written notice from time to
     time during the Collaboration Term, representatives of BMS shall have the
     right to inspect the facilities used by Lexicon hereunder and to audit the
     care, treatment and use of the animals used in Lexicon's performance
     hereunder.

F.   Except to the extent otherwise provided in this Agreement, title to animals
     used hereunder shall remain with Lexicon. Upon conclusion of Lexicon's work
     under this Agreement, the animals shall be disposed of as provided in any
     protocol or other agreed upon methodology, unless otherwise mutually agreed
     or unless BMS requests that such animals be transferred to BMS (in which
     case Lexicon will do so in accordance with the terms of the Agreement).
     Destruction of any animals by Lexicon shall be accomplished in a lawful and
     humane manner.

G.   Lexicon agrees that no drug or device provided by BMS to Lexicon may be
     used in humans under any circumstances.

H.   If any work to be done by Lexicon hereunder is intended as a non-clinical
     laboratory safety study to be submitted to or reviewed by the FDA, Lexicon
     agrees to comply with the requirements of 21 CFR 58.1 et seq. in the
     conduct of such work. In such event, BMS will notify Lexicon of this
     intention.


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