Document:

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                                                                   EXHIBIT 10.17

[*] CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY
    BRACKETS, HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND
    EXCHANGE COMMISSION PURSUANT TO RULE 406 OF THE SECURITIES EXCHANGE ACT OF
    1933, AS AMENDED.

                       COLLABORATION AND LICENSE AGREEMENT

      THIS COLLABORATION AND LICENSE AGREEMENT (the "Agreement") is made
effective as of the 20th day of June, 2001 ("Effective Date") by and between
Cytokinetics, Inc., a Delaware corporation ("CK") and Glaxo Group Limited, a
GlaxoSmithKline company, a United Kingdom corporation ("GSK"). CK and GSK are
each referred to herein by name or as a "Party" or, collectively, as "Parties".

                                    RECITALS

      A. CK has developed certain proprietary technology related to KSP (as
defined below) and other human mitotic kinesins, which are potential targets for
the discovery and development of pharmaceutical products for the treatment,
prophylaxis and diagnosis of cancer and other diseases and conditions in humans.
As a result of its on-going research, CK has established a leadership position
in the field of human mitotic kinesins.

      B. CK is the owner of all right, title and interest in, or otherwise
controls, certain CK Patents (as defined below) hereto, and CK Know-How (as
defined below) relating to KSP and certain novel targets and compounds having
activity against human mitotic kinesins.

      C. GSK possesses pharmaceutical research, development, manufacturing and
commercialization capabilities, as well as proprietary technology in a broad
range of therapeutic fields. GSK desires to engage in collaborative research
with CK to discover, develop, make, market and sell worldwide pharmaceutical
products directed to human mitotic kinesins.

      D. In addition, CK has identified certain novel, proprietary compounds
having activity against human mitotic kinesins, including that certain compound
designated as [*], which CK is pursuing as a development compound for cancer and
for which CK has commenced preclinical development activities. GSK is
interested, subject to Section 2.5 below, in developing certain of the compounds
identified by CK, and, subject to Section 3.1.1 below, intends to consider [*]
as a potential Development Compound (as defined below) after the Effective Date.

      E. CK desires to grant to GSK, and GSK desires to obtain, an exclusive
license throughout the world under this Agreement to discover, develop, make,
have made, market and sell certain Licensed Products (as defined below)
throughout the world under the aforesaid CK Patents and CK Know-How.

      F. Contemporaneously with the execution of this Agreement, the Parties
have executed a Stock Purchase Agreement under which GSK shall purchase
preferred stock of CK at the Closing of the transactions (as defined below).

      Now, therefore, in consideration of the premises and mutual covenants
herein contained, and for other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the Parties hereto agree as
follows:

* Certain information on this page has been omitted and filed separately with
  the Commission. Confidential treatment has been requested with respect to the
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                            ARTICLE I - DEFINITIONS

      The following terms shall have the following meanings as used in this
Agreement:

      1.1 "ABANDONED PRODUCT" shall have the meaning ascribed to it in Section
4.5.4.

      1.2 "AFFILIATE" shall mean any corporation or other entity which is
directly or indirectly controlling, controlled by or under common control of a
Party hereto for so long as such control exists. For the purposes of this
Section 1.2, "control" shall mean the direct or indirect ownership of at least
fifty percent (50%) of the outstanding shares or other voting rights of the
subject entity having the power to vote on or direct the affairs of the entity,
or if not meeting the preceding, the maximum voting right that may be held by
the particular Party under the laws of the country where such entity exists.

      1.3 "CK" shall mean CK and any Affiliate of CK.

      1.4 "CK EXISTING TECHNOLOGY" shall mean, subject to Sections 5.2.2(a) and
5.5 below, CK Patents and CK Know-How, other than Collaboration Technology and
Post-Collaboration Technology, Controlled by CK, and created, prior to the
Effective Date or prior to the end of the Exclusivity Period that are reasonably
necessary or useful for the Parties to conduct their respective activities under
the Research Program and for GSK to develop, make, have made, use, import, offer
to sell and sell Compounds, Development Compounds or Licensed Products in the
Field. Notwithstanding the foregoing, a CK Library Compound and CK Patents and
CK Know-How with respect thereto shall be deemed to be CK Existing Technology
only to the extent provided in Section 5.2.2 below.

      1.5 "CK COMPOUND" shall mean, except as otherwise provided herein, a
chemical entity that meets the Compound Criteria for a CK Target, which is
identified by CK using CK Existing Technology, GSK Existing Technology,
Collaboration Technology, and/or Post-Collaboration Technology prior to or
during the Exclusivity Period. Any such chemical entity shall not be subject to
development as a Compound in accordance with Section 2.7 of this Agreement, and
GSK is not obligated to conduct any research or development activities with
respect thereto. Notwithstanding the foregoing:

            (a) A chemical entity that meets the Compound Criteria for a CK
Target and which is identified by CK after the end of the Exclusivity Period
shall also be a CK Compound, if such chemical entity was derived from a compound
within the GSK Existing Technology, Collaboration Technology or
Post-Collaboration Technology or from a GSK Library Compound licensed to CK
under Section 5.3.2 below.

            (b) Except as provided in Section 5.6, in the event that a Mitotic
Kinesin Target becomes a CK Target (i.e., in the events provided in this
Agreement), any chemical entity that had been identified as a Compound with
respect to such Mitotic Kinesin Target prior to the time such Mitotic Kinesin
Target becomes a CK Target shall be deemed a CK Compound, except as provided in
Section 1.5(c) below.

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            (c) A GSK Library Compound shall be deemed a CK Compound only to the
extent that it is GSK Existing Technology, as provided in Section 5.3.2 below.

      1.6 "CK KNOW-HOW" shall mean Information that (a) CK discloses to GSK
under this Agreement or under the Non-Disclosure Agreement executed by CK and
GSK dated May 18, 2000, as amended and (b) is within the Control of CK.
Notwithstanding anything herein to the contrary, CK Know-How excludes published
CK Patents.

      1.7 "CK LIBRARY COMPOUND" shall mean a chemical entity (i) that is
Controlled by CK as of the Effective Date, but which CK has not identified as
meeting the Compound Criteria or criteria similar to the Compound Criteria for a
Mitotic Kinesin Target as of the Effective Date, or (ii) which is developed or
acquired by CK outside of the Research Program with no use of GSK Existing
Technology or GSK Library Compounds, Collaboration Technology or
Post-Collaboration Technology, and, during the Exclusivity Period or any
Extension Period, in activities not directed to the discovery, development,
manufacture or use of Mitotic Kinesin Targets or inhibitors of such Mitotic
Kinesin Targets. It is understood that the term CK Library Compound shall
include both chemical entities that have actually been synthesized as well as
those that have not been synthesized but that are claimed in a CK Patent, so
long as the conception and reduction to practice of such chemical entity were
made in the manner described in clause (ii) above.

      1.8 "CK PATENTS" shall mean all Patents in the Territory owned or
Controlled by CK, including, without limitation, those provided to GSK under the
Non-Disclosure Agreement executed by CK and GSK dated May 18, 2000, as amended.
CK shall update GSK regarding any CK Patents within the Licensed Technology (i)
on an annual basis commencing after the Effective Date in accordance with
Section 2.4 below, and (ii) upon request by GSK after the end of the Research
Term, with respect to CK Patents to which GSK retains a license hereunder.

      1.9 "CK PRODUCT" shall mean pharmaceutical preparations for human use,
incorporating a CK Compound as one of or its main active ingredient.

      1.10 "CK TARGET" shall mean those Mitotic Kinesin Targets designated as CK
Targets in accordance with Section 2.7 or another provision of this Agreement.

      1.11 "CO-FUNDING OPTION" shall mean the option of CK to fund a portion of
the Later Stage Development Costs of a Licensed Product as provided in Section
3.4.

      1.12 "COLLABORATION TARGET" shall mean those Mitotic Kinesin Targets that
are selected as Collaboration Targets in accordance with Section 2.7 or Section
2.8, except as otherwise provided in this Agreement.

      1.13 "COLLABORATION TECHNOLOGY" shall mean, subject to Sections 5.2.2,
5.3.2 and 5.5 below, all inventions and Information, invented, conceived or
created solely or jointly by employees, agents or consultants of GSK and/or CK
in the course of performing their respective activities in connection with the
Research Program, or their activities specifically directed to the research,
development, manufacture or use of Compounds, Development Compounds or Licensed
Products, in

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each case during the Research Term. Collaboration Technology shall include all
CK Patents and GSK Patents in and to any inventions described in this Section
1.13.

      1.14 "COMBINATION PRODUCT" shall mean a Licensed Product that is a
pharmaceutical preparation for human use incorporating two or more
therapeutically active ingredients, including a Development Compound, as its
main active ingredients. Notwithstanding the foregoing, drug delivery vehicles,
adjuvants, and excipients shall not be deemed to be "therapeutically active
ingredients," and their presence shall not be deemed to create a Combination
Product under this Section 1.14.

      1.15 "COMPLETION OF SCREENING" shall mean the date on which the screenings
described in Section 2.7.1 have been completed, in accordance with the criteria
set forth in Section 2.7.4.

      1.16 "COMPOUND" shall mean, except as otherwise provided herein, a
chemical entity that meets the Compound Criteria for a Mitotic Kinesin Target,
which chemical entity (i) is discovered, synthesized or identified by CK or GSK
using CK Existing Technology, GSK Existing Technology, Collaboration Technology,
and/or Post-Collaboration Technology prior to, during, or, in the case of GSK
(subject to (a) below), after the Exclusivity Period or any Extension Period,
and which, (ii) at GSK's discretion, may be subject to development as a
Development Compound under Section 2.5 of this Agreement. Notwithstanding the
foregoing:

            (a) A chemical entity that is first identified by GSK after the end
of the Exclusivity Period, or after any Extension Period under Section 4.2.2
below (whichever is later), shall not be deemed a Compound unless such chemical
entity was discovered, synthesized or identified using CK Existing Technology,
Collaboration Technology or Post-Collaboration Technology.

            (b) Those chemical entities Controlled by a Party prior to the
Effective Date, which such Party identified as meeting the Compound Criteria (or
criteria substantially similar to the Compound Criteria) as of the Effective
Date, shall also be deemed Compounds for all purposes of this Agreement. In the
case of CK, these compounds shall include certain of those compounds that are
referred to by CK as the "Series [*] Compounds," as well as certain other
compounds, that CK has so identified as meeting the Compound Criteria (or such
substantially similar criteria) prior to the Effective Date.

            (c) Notwithstanding (b) above, at such time as a chemical entity
becomes a CK Compound, the same shall be deemed excluded from the definition of
Compounds under this Section 1.16 for all purposes (including, without
limitation, for purposes of Sections 1.21 and 1.44).

            (d) For purposes of clarity, a compound developed by either Party
outside the Research Plan and provided for screening or other use under this
Agreement shall not be deemed a Compound unless and until such compound is shown
to meet the Compound Criteria.

      1.17 "COMPOUND CRITERIA" shall mean (i) those criteria set forth in
Exhibit 1.17, and (ii) such other criteria as are approved by the JRC and agreed
in writing by the Parties. No criteria shall be deemed Compound Criteria under
(ii) unless such criteria are formally approved by the JRC

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and agreed in writing by the Parties, regardless of whether such criteria are
used informally or discussed by the Parties in the course of the Research
Program.

      1.18 "CONTRACT YEAR" shall mean a year of 365 days (or 366 days in a leap
year) beginning on the Effective Date and ending one (1) year thereafter and so
on year-by-year. "CONTRACT YEAR ONE" shall mean the first such year; "CONTRACT
YEAR TWO" shall mean the second such year, and so on, year-by-year.

      1.19 "CONTROL," "CONTROLS," "CONTROLLED" or "CONTROLLING" shall mean
possession of the ability to grant the licenses or sublicenses as provided
herein without violating the terms of any agreement or other arrangements with
any Third Party.

      1.20 "CYTOMETRIX(TM) TECHNOLOGY" shall mean that certain subject matter as
further described in CK publication "Cytometrix(TM) Cellular Phenotyping
Technologies Version 0.5 Development Partner Program" (publication February
2001), and modifications, improvements, extensions or derivatives to such
automated cell biology platform.

      1.21 "DEVELOPMENT COMPOUND" shall mean a Compound that is designated for
product development, in accordance with Section 2.5 below.

      1.22 "DEVELOPMENT MILESTONE" shall mean a milestone described in Section
6.4.

      1.23 "DEVELOPMENT PLAN" shall mean the workplan with respect to the
development of a Development Compound as set forth in Section 3.2.

      1.24 "EFFECTIVE DATE" shall mean the date first written above.

      1.25 "EXCLUSIVITY PERIOD" shall mean the period of time commencing with
the Effective Date and ending upon the first anniversary of the end of the
Research Term and any extensions thereto under Section 2.8.

      1.26 "EXTENSION PERIOD" shall mean a one-year period during which GSK has
extended its exclusivity with respect to a particular Collaboration Target or
Extendable Unselected Target, in accordance with Section 4.2.2.

      1.27 "EXTENDED TARGET" and "EXTENDABLE UNSELECTED TARGET" shall have the
meanings set forth in 4.2.2.

      1.28 "FDA" shall mean, with respect to the United States, the U.S. Food
and Drug Administration, any successor entity thereto, or any equivalent foreign
regulatory authority(ies) in the particular country of the Territory.

      1.29 "FIELD" shall mean, subject to Section 2.6.4, (i) the [*] or [*]
treatment of cancer and other diseases and conditions in humans through the use
of a Licensed Product; and (ii) [*] of the [*] or [*] of a patient, including
the [*] of the [*] (e.g., [*] or [*] or [*]) to [*] of a Licensed Product, for
the [*] of a Licensed Product(s) [*] for the [*] or [*] treatment of cancer and
other diseases and

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   the Commission. Confidential treatment has been requested with respect to the
   omitted portions.

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conditions in a human patient. All other uses not specifically set forth in (i)
or (ii) above are excluded from the Field.

      1.30 "FTE" shall mean a full-time person employed by CK, or by a Third
Party pursuant to Section 6.2.2, dedicated full-time to the Research Program, or
in the case of less than a full-time dedicated person, a full-time, equivalent
person year, based upon a total of one thousand eight hundred eighty (1,880)
hours per year of work on the Research Program.

      1.31 "GSK" shall mean GSK and any Affiliate of GSK.

      1.32 "GSK EXISTING TECHNOLOGY" shall mean, subject to Section 5.3.2 below,
GSK Patents and GSK Know-How, other than Collaboration Technology and
Post-Collaboration Technology, Controlled by GSK, and created, prior to the end
of the Exclusivity Period or any Extension Period under Section 4.2.2 below,
that: (i) are reasonably necessary for the discovery, development, manufacture,
use or sale of Compounds, Development Compounds, Licensed Products, or (ii) GSK
has utilized or incorporated in connection with its activities under the
Research Program or the development, manufacture, use or sale of Compounds,
Development Compounds or Licensed Products. In addition, GSK Existing Technology
shall be subject to the following:

            (a) Notwithstanding (i) and (ii) above, a GSK Library Compound and
GSK Patents and GSK Know-How with respect thereto shall be deemed GSK Existing
Technology only to the extent provided in Section 5.3.2 below.

            (b) Notwithstanding (i) above, in the event a Compound, Development
Compound or Licensed Product becomes a CK Compound or CK Product, or a Mitotic
Kinesin Target is designated a CK Target, then with respect to such CK Compound,
CK Product or CK Target (and any other CK Compounds and CK Products directed to
such CK Target), the GSK Existing Technology within (i) and (ii) above shall
include only subject matter that was (x) identified as reasonably necessary for
the discovery, development, manufacture, use or sale of such CK Compound or CK
Product, or (y) used or applied at least in part to such CK Compound, CK Product
or CK Target, each prior to its being designated as such. Accordingly, for
example, a drug delivery technology that had not been applied to a Compound
prior to its becoming a CK Compound shall not later become GSK Existing
Technology with respect to such CK Compound (or a CK Product incorporating such
CK Compound) regardless of whether such GSK drug delivery technology is
reasonably necessary to commercialize such CK Compound.

      1.33 "GSK KNOW-HOW" shall mean Information which (a) GSK discloses to CK
under this Agreement or under the Non-Disclosure Agreement executed by CK and
GSK dated May 18, 2000, as amended and (b) is within the Control of GSK.
Notwithstanding anything herein to the contrary, GSK Know-How excludes published
GSK Patents.

      1.34 "GSK LIBRARY COMPOUND" shall mean a chemical entity (i) that is
Controlled by GSK as of the Effective Date, or (ii) which is developed or
acquired by GSK outside of the Research Program with no use of CK Existing
Technology or CK Library Compounds, Collaboration Technology or
Post-Collaboration Technology, and, during the Exclusivity Period or any
Extension Period, in activities not directed to the discovery, development,
manufacture or use of Mitotic

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Kinesin Targets or inhibitors of such Mitotic Kinesin Targets. It is understood
that the term "GSK Library Compound" shall include both chemical entities that
have actually been synthesized as well as those that have not been synthesized
but that are claimed in a GSK Patent, so long as the conception and reduction to
practice of such chemical entity were made in the manner described in clause
(ii) above.

      1.35 "GSK PATENTS" shall mean all Patents in the Territory owned or
Controlled by GSK. GSK shall update CK regarding any GSK Patents within the
Licensed Technology (i) on an annual basis commencing after the Effective Date
in accordance with Section 2.4 below, and (ii) upon request by CK after the end
of the Research Term, with respect to GSK Patents to which CK retains a license
hereunder.

      1.36 "IND" shall mean any investigational new drug application filed with
the FDA as more fully defined in 21 C.F.R. Section 312.3 or its equivalent in
any country.

      1.37 "IND ENABLING STUDIES" shall mean studies which are specifically
required for an IND, including without limitation, ADME and GLP toxicology
studies, or studies required for the preparation of the CMC section of an IND
including studies relating to analytical methods and purity analysis, and
formulation and manufacturing development studies, all as necessary to obtain
the permission of regulatory authorities to begin human clinical testing.

      1.38 "INFORMATION" shall mean information and materials relating to the
subject matter of this Agreement and including (i) techniques and data,
including, but not limited to, screens, models, inventions, methods, test data,
including but not limited to, pharmacological, toxicological and clinical test
data, analytical and quality control data, marketing, pricing, distribution,
costs, and sales data, manufacturing information, and patent and legal data or
descriptions (to the extent that disclosure thereof would not result in loss or
waiver of privilege or similar protection) and (ii) compositions of matter,
including but not limited to compounds, biological materials and assays. As used
herein, "clinical test data" shall be deemed to include all information related
to the clinical or preclinical testing of a Compound, Development Compound, CK
Compound, Licensed Product or CK Product, including without limitation, patient
report forms, investigators' reports, biostatistical, pharmaco-economic and
other related analyses, regulatory filings and communications, and the like.

      1.39 "JOINT RESEARCH COMMITTEE" (or "JRC"), "JOINT DEVELOPMENT COMMITTEE"
(or "JDC"), "JOINT COMMERCIALIZATION COMMITTEE" (or "JCC") and "JOINT STEERING
COMMITTEE" (or "JSC") shall mean the committees established under Sections 2.2,
3.5, 7.2 and 12.2, respectively.

      1.40 "KSP" shall mean any protein expressed by the human gene located at
the locus [*].

      1.41 "LATER STAGE DEVELOPMENT" and "LATER STAGE DEVELOPMENT COSTS" shall
have the meanings defined in Sections 3.4.3(a) and 3.4.3(c), respectively.

      1.42 "LEAD TARGET" shall mean a Mitotic Kinesin Target identified in
accordance with the procedures set forth in Section 2.7.

      1.43 "LEAD TARGET SELECTION DATE" shall mean the date set forth in Section
2.7.1.

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      1.44 "LICENSED PRODUCT" shall mean a pharmaceutical preparation for human
use incorporating a Development Compound as one of or its main active ingredient
or designated as such under Section 4.5.2.

      1.45 "LICENSED TECHNOLOGY" shall mean CK Existing Technology; GSK Existing
Technology; Collaboration Technology; and Post-Collaboration Technology.

      1.46 "MAJOR EUROPEAN COUNTRY" shall mean France, Germany, Italy, Spain, or
the United Kingdom.

      1.47 "MARKETING APPROVAL" shall mean all approvals, licenses,
registrations or authorizations of any federal, state or local regulatory
agency, department, bureau or other governmental entity, necessary for the
manufacturing, use, storage, import, transport and sale of Licensed Products in
a regulatory jurisdiction. Marketing Approval shall be deemed to occur upon
first receipt of notice from the FDA, EMEA or similar agency that sale of a
Licensed Product has been approved. For countries where governmental approval is
required for pricing or reimbursement for the Licensed Product to be reimbursed
by national health insurance (i.e., other than the United States), "Marketing
Approval" shall not be deemed to occur until such pricing or reimbursement
approval is obtained; provided, that if a Party has not accepted the pricing or
reimbursement offered by the governmental authority of a particular country
within eighteen (18) months after the date the first MAA is approved in such
country, then the Party shall continue to use diligent efforts to obtain such
pricing or reimbursement. Marketing Approval shall be deemed to have occurred in
such country where government approval of pricing has not been obtained if, at
any time, the Party begins the commercial sale of such Licensed Product in the
country without obtaining pricing approval, with the date of MAA approval to
occur on the date of the first commercial sale of the Licensed Product in the
country.

      1.48 "MARKETING APPROVAL APPLICATION" or "MAA" shall mean a New Drug
Application (as defined in 21 C.F.R.Section 314.50 et. seq.), or a comparable
filing for Marketing Approval (not including pricing or reimbursement approval)
in a country, in each case with respect to a Licensed Product in the Territory.

      1.49 "MITOTIC KINESIN TARGET" shall mean (i) the human kinesin motor
proteins KSP; [*]; and (ii) those other human proteins which are kinesin motor
proteins which are discovered or acquired by either Party prior to the [*]
anniversary of the end of the Research Term, excluding any extension thereof
under Section 2.8, and which meet the criteria set forth in a separate written
memorandum signed by both Parties expressly referencing this Section 1.49.

      1.50 "NET SALES" shall mean the gross invoice price by GSK or its
Affiliates or Sublicensees, as the case may be, for all Licensed Products sold
by GSK, its Affiliates or Sublicensees ("Selling Party"), in finished product
form, packaged and labeled for sale, under this Agreement in arm's length sales
to Third Parties less deductions allowed to the Third Party customer by the
Selling Party, to the extent actually taken by such Third Party customer, on
such sales for:

            (a) trade, quantity, and cash discounts;

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            (b) credits, rebates and chargebacks (including those to
managed-care entities and government agencies), and allowances or credits to
customers on account of rejection or returns (including, but not limited to,
wholesaler and retailer returns) or on account of retroactive price reductions
affecting such Licensed Product;

            (c) freight, postage and duties, and transportation charges relating
to Licensed Product, including handling and insurance thereto; and

            (d) sales (such as VAT or its equivalent) and excise taxes, other
consumption taxes, customs duties and compulsory payments to governmental
authorities and any other governmental charges imposed upon the importation, use
or sale of such Licensed Product to Third Parties.

      Sales between GSK and its Affiliates or Sublicensees shall be excluded
from the computation of Net Sales and no payments will be payable on such sales
except where such Affiliates or Sublicensees are end users. In addition, the
Selling Party may exclude from Net Sales a reasonable provision for
uncollectible accounts, to the extent such reserve is determined in accordance
with U.S. generally accepted accounting standards, consistently applied across
all product lines of the particular Party, until such amounts are actually
collected.

      In the event a Licensed Product is sold which is a Combination Product
under Section 1.14, for purposes of determining payments due CK under Section
4.5.2(b) and (d) or Section 6.6, Net Sales of Combination Products shall be
calculated by multiplying the Net Sales of the Combination Product by the
fraction A over A+B, in which A is the Gross Selling Price of the Licensed
Product when such Product is sold in substantial quantities comprising a
Development Compound as the sole therapeutically active ingredient during the
applicable accounting period in which the sales of the Licensed Product were
made, and B is the Gross Selling Price of the other therapeutically active
ingredients contained in the Combination Product sold separately in substantial
quantities during the accounting period in question. All Gross Selling Prices of
the therapeutically active ingredients of the Licensed and Combination Products
shall be calculated as the average Gross Selling Price of the therapeutically
active ingredients in such Products during the applicable accounting period for
which the Net Sales are being calculated. In the event that no separate sale of
either the Licensed Product comprising a single Development Compound as the sole
therapeutically active ingredient or the other therapeutically active
ingredients of the Combination Product are made during the accounting period in
which the sale was made or if the Gross Selling Price for a particular
therapeutically active ingredient cannot be determined for an accounting period,
Net Sales allocable to the Licensed Product and Combination Product shall be
determined by mutual agreement reached in good faith by the Parties prior to the
end of the accounting period in question based on an equitable method of
determining same that takes into account, in the Territory, variations in
potency, the relative contribution of each therapeutically active ingredient in
the Combination Product, and relative value to the end user of each
therapeutically active ingredient. For purposes of this Section 1.50, "Gross
Selling Price" shall mean the gross price at which an active ingredient is sold
to a Third Party, before discounts, deductions, credits, taxes or allowances.

      1.51 "PATENT" shall mean (i) issued and unexpired Letters Patent,
including any extension, registration, confirmation, reissue, continuation, SPC,
divisional, continuation-in-part,

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re-examination or renewal thereof, (ii) pending applications for Letters
Patents, and (iii) foreign counterparts of any of the foregoing; in each case to
the extent the same has not been held, by a court or governmental agency of
competent jurisdiction, to be invalid or unenforceable in a decision from which
no appeal can be taken.

      1.52 "PHASE I," "PHASE II," "PHASE III" and "PHASE IV" shall have the
following meanings:

            (a) "PHASE I" shall mean, subject to Section 6.4.3(c), the first
clinical trial in which a particular Licensed Product is administered to either
a patient or healthy volunteer.

            (b) "PHASE II" with respect to cancer indications shall mean a
clinical trial, the purpose of which is to investigate the activity of a
Licensed Product in cancer using a dose studied in a Phase I clinical trial for
such Licensed Product. "Phase II" with respect to non-cancer indications shall
mean a dose-ranging study or a study exploring efficacy in a disease other than
cancer.

            (c) "PHASE III" shall mean a pivotal efficacy trial required to
demonstrate substantial evidence of the efficacy and safety of a Licensed
Product for submission of an MAA.

            (d) "PHASE IV" shall mean a clinical trial conducted for a Licensed
Product under an IND in a particular country after the Licensed Product has
received Marketing Approval and has been marketed and commercially sold in that
country, which is conducted primarily to continue testing the Licensed Product
to collect information about its safety and/or efficacy in broader or various
populations, long-term safety and side effects associated with long-term use,
and its use in additional indications other than that for which Marketing
Approval was initially granted.

      1.53 "POST-COLLABORATION TECHNOLOGY" shall mean, subject to Sections
5.2.2, 5.3.2, 5.5 and 12.5.2 below, all inventions and Information invented or
created solely or jointly by employees, agents or consultants of GSK and/or CK
during the one (1) year period immediately following the end of the Research
Term or during any Extension Period, and which in each case are invented or
created in the course of performing activities specifically directed to the
research, discovery, characterization, optimization or development of Compounds,
Collaboration Targets or Unselected Targets, or to the development, manufacture,
use or sale of Compounds, Development Compounds or Licensed Products.
Notwithstanding the foregoing, Post-Collaboration Technology shall also include
all inventions and Information invented or created by or under authority of GSK,
which are created or invented in the course of performing such activities after
such period and during the term of this Agreement. Post-Collaboration Technology
shall include all CK Patents and GSK Patents in and to any inventions described
in this Section 1.53.

      1.54 "PRE-PROGRAM FTES" and "[*] PROGRAM FTES" shall have the meanings
ascribed to them in Section 2.6.1 and 2.6.2.

      1.55 "[*] PROGRAM" shall mean a formal research program established in the
discretion of [*] with respect to a particular Mitotic Kinesin Target for the
commitment of resources at GSK and

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at CK under the Research Program, which program has undergone the detailed
review of the [*] or [*]. At a minimum, a [*] Program shall comprise those
activities set forth in Exhibit 1.55.

      1.56 "PROJECT TEAM" shall mean the team of [*] personnel and [*] ([*]) [*]
formed in accordance with Section 3.2 to manage the development of a Development
Compound.

      1.57 "RESEARCH PERFORMANCE MILESTONE" shall mean the milestones set forth
in Section 6.3.1.

      1.58 "RESEARCH PLAN" shall mean the written workplan for the Research
Program to be conducted under this Agreement established in accordance with
Section 2.3 hereof.

      1.59 "RESEARCH PROGRAM" shall mean the research, discovery,
characterization, optimization and pre-clinical development of inhibitors of
Mitotic Kinesin Targets, and the discovery and characterization of Mitotic
Kinesin Targets, conducted by CK and/or GSK which are undertaken during the
Research Term; provided that the Research Program shall not include any such
activities performed by CK with respect to a CK Compound or CK Target after such
Compound or Target becomes a CK Compound or CK Target, respectively.

      1.60 "RESEARCH TERM" shall mean the period commencing on the Effective
Date and ending on the first to occur of (i) termination of this Agreement by
either Party under Article XI below; or (ii) five (5) years after the Effective
Date, or if the Research Term is extended under Section 2.8 below, the end of
such extended Research Term.

      1.61 "SALES AND MARKETING PLAN" shall mean the plan and budget for the
marketing, promotion, sale and distribution of a Licensed Product established by
the JCC in accordance with Section 7.2.

      1.62 "SUBLICENSEE" shall mean, with respect to a particular Licensed
Product or CK Product, a Third Party to whom GSK or CK, respectively, has
granted a license or sublicense under any Licensed Technology to make and sell
such Licensed Product or CK Product. As used in this Agreement, "Sublicensee"
shall also include a Third Party to whom GSK or CK has granted the right to
distribute a Licensed Product or CK Product, respectively, provided that such
Third Party is responsible for marketing and promotion of such Licensed Product
or CK Product within its distribution territory.

      1.63 "TERRITORY" shall mean the entire world.

      1.64 "THIRD PARTY" shall mean any entity other than CK or GSK.

      1.65 "TRACTABLE COMPOUND" shall mean a Compound that, in the reasonable
determination of the JRC during the Research Term, or, with respect to Compounds
directed to Extendable Unselected Targets identified during any Extension
Period, in the reasonable determination of GSK, meets the criteria in Exhibit
1.65.

      1.66 "UNSELECTED TARGET" shall mean any Mitotic Kinesin Target that has
not been identified as a Lead Target (i) by the end of Contract Year Five or
(ii) in the event GSK extends the

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Research Term in accordance with Section 2.8.2, by the end of the Research Term,
subject in each case to Section 2.7.3 below.

      1.67 "CLOSING" and "CLOSING DATE" shall mean the date specified in Section
13.1.

                  ARTICLE II - COLLABORATION RESEARCH PROGRAM

      2.1 Research Program.

            (a) CK and GSK agree to conduct a research program on a
collaborative basis with the principal goal of identifying, developing, and
commercializing Compounds, Development Compounds and Licensed Products within
the Field, the mechanism of action of which is to inhibit Mitotic Kinesin
Targets. The Research Program shall be conducted solely in accordance with the
Research Plan, unless otherwise agreed by the Parties in writing. Each Party
agrees to keep the other Party informed of its progress and activities within
the Research Program.

            (b) Each Party shall contribute to the Research Program the Mitotic
Kinesin Targets and Compounds identified by such Party prior to the Effective
Date, as well as those Mitotic Kinesin Targets, Compounds, Development Compounds
and Licensed Products identified during the Research Term. This Section 2.1(b)
shall not be deemed to limit CK's rights with respect to CK Compounds, CK
Targets or CK Products.

      2.2 The JRC. Promptly after the Effective Date, the Parties shall
establish a Joint Research Committee ("JRC"). The JRC shall have responsibility
to (i) oversee, review and coordinate the Research Program and to expedite the
progress of work being done under the Research Plan, and (ii) to make such other
decisions as are expressly allocated to the JRC under this Agreement. The JRC
shall exist until the end of the Research Term. Each Party agrees to keep the
JRC informed of its progress and activities within the Research Program.

            (a) Membership. The JRC shall be comprised of an equal number of
representatives from each of GSK and CK. The exact number of such
representatives shall be three (3) for each of GSK and CK, or such other number
as the Parties may agree. The initial members of the JRC shall be [*] from GSK,
and [*] from CK. Either Party may replace its respective JRC representatives at
any time, with prior written notice to the other Party. Unless otherwise agreed,
the JRC shall at all times include the CK officer overseeing all research and
the following GSK representatives: the senior Center of Excellence for Drug
Discovery ("CEDD") representatives responsible for biology, chemistry and
clinical activities of the collaboration, any of whom may be replaced by the
head of the CEDD. From time to time, the JRC may establish subcommittees to
oversee particular projects or activities, and such subcommittees will be
constituted as the JRC approves.

            (b) Meetings. The JRC shall meet monthly, or as more or less often
as otherwise agreed by the Parties, at such locations as the Parties agree. It
is understood that such meetings shall be held at least quarterly in person,
otherwise by telephone.

            (c) Decision Making. Decisions of the JRC shall be made by majority
vote of the members present in person or by other means (e.g., teleconference)
at any meeting;

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provided that, if there is not an equal number of representatives of each Party
present at such meeting, then only an equal number of representatives of each
Party shall be entitled to vote at such meeting. In the event that the votes
required to approve a decision cannot be reached, then either Party may, by
written notice to the other, have such issue referred to the Chief Executive
Officer of CK and the Chairman, Research and Development, Pharmaceuticals of
GSK, for attempted resolution by good faith negotiations within thirty (30) days
after such notice is received. Minutes of the JRC meetings shall be taken, and
shall, at a minimum, record all decisions made. Such minutes shall be approved
by both Parties.

            (d) Responsibilities. The JRC shall be responsible for preparing the
Research Plan for each Contract Year, other than the initial Research Plan,
monitoring and adapting the Research Plan based on the results and progress of
the Research Program, establishing objectives for the Research Program and
evaluating the progress of the Research Program, including without limitation:

                  (i) Deciding the direction and objectives of the Research
Program;

                  (ii) Approving FTE requirements (subject to Section 2.6);

                  (iii) Recommending Mitotic Kinesin Targets to be submitted for
approval by [*] as [*] Programs;

                  (iv) Recommending Compounds to be submitted for [*] approval
as Development Compounds in accordance with Section 2.5; and

                  (v) Providing a forum for the exchange of scientific
information among the scientists participating in the Research Program.

      2.3 Research Plan.

            2.3.1 Responsibilities. The Research Program shall be carried out in
accordance with the Research Plan. Each Party will be responsible for conducting
those activities within the Research Program as are allocated to such Party
under the Research Plan. The Research Plan shall be based on priorities with
respect to Compounds and Mitotic Kinesin Targets other than CK Targets, taking
into account GSK's and CK's views as to the feasibility of the scope and timing
of research activities and objectives.

            2.3.2 Establishment of Research Plan. The initial Research Plan
shall be established by the mutual agreement of the Parties immediately upon the
execution of this Agreement (the "Initial Research Plan") and shall cover the
period from the Effective Date through December 31, 2001 in detail and includes
general plans for the following two (2) years. By December 1 of each year during
the Research Term, the JRC shall establish and approve the detailed Research
Plan for the next succeeding year, including a general plan for the following
two (2) years or the period remaining in the Research Term, whichever is
shorter. The JRC shall review the Research Plan on an ongoing basis and may make
changes thereto as the JRC approves in writing or as reflected in agreed and
approved minutes of JRC meetings.

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      2.4 Information and Reports. GSK and CK will use diligent efforts to make
available and disclose to each other all Collaboration Technology and
Post-Collaboration Technology pertaining to Mitotic Kinesin Targets (other than
CK Targets, which are addressed in Section 4.4 below) including all Patents and
Information within such Technology regarding compounds synthesized or
discovered, initial leads, activities of leads, derivatives, and results of in
vitro and in vivo studies, assay techniques and new assays immediately after the
Effective Date and continuing throughout the Research Term, with significant
discoveries or advances being communicated as soon as reasonably practical after
such Information is obtained or its significance is appreciated; provided,
however, that with respect to tangible research material, the Parties shall
exchange such material as determined by the JRC. The Parties will exchange,
during the Research Term, at least once quarterly, a written summary of such
research and results. Within [*] ([*]) days after the [*] anniversary of the
expiration of the Research Term, and of the end of each Extension Period, each
Party shall provide to the other such a written report directed to results
obtained, and Post-Collaboration Technology developed, during the [*] period
following the end of the Research Term. Within [*] ([*]) days after the end of
each Extension Period under Section 4.2.2, each Party will provide the other
with raw data within the Collaboration Technology and Post-Collaboration
Technology to the extent reasonably requested by the other Party. Each Party
shall use diligent efforts to inform the other Party of any of its respective
Existing Technology used or incorporated in connection with the Research Program
or any Extended Target. In addition, each Party will disclose its respective
Existing Technology to the extent reasonably necessary for the other Party to
perform activities under the Research Plan.

      2.5 Designation of Development Compounds. The Parties have established
guidelines, set forth in Exhibit 2.5, for the designation of Compounds as
Development Compounds. From time to time, either Party may suggest that the JRC
consider a particular Compound to be recommended to [*] for consideration as a
Development Compound. Based upon the guidelines and the results of the Research
Program, the JRC shall designate from time to time Compounds for consideration
by [*] as Development Compounds, and upon approval by [*], the Compounds shall
be deemed Development Compounds. [*] may approve, or withhold its approval of,
the designation of any Compound as a Development Compound in [*], whether or not
such Compound [*] the [*], and a Compound shall not be deemed a Development
Compound unless so approved by [*]. Unless the JRC otherwise approves, however,
[*] agrees not to undertake IND Enabling Studies with respect to a particular
Compound, until such Compound has been designated as a Development Compound in
accordance with this Section 2.5.

      2.6 FTE Requirements; Funding. To advance the Research Program, GSK agrees
to fund CK FTEs performing research under the Research Plan in accordance with
Section 6.2 below and this Section 2.6. In addition:

            2.6.1 Generally. Unless otherwise agreed by the Parties or as
otherwise provided in this Section 2.6, the Research Plan shall provide for, and
GSK agrees to fund, [*] ([*]) CK FTEs in Contract Year One; [*] ([*]) CK FTEs in
Contract Year Two; [*] ([*]) CK FTEs in Contract Year Three; [*] ([*]) CK FTEs
in Contract Year Four; and [*] ([*]) CK FTEs in Contract Year Five (the
"Pre-Program FTEs"). The Pre-Program FTEs shall be funded at the rate set forth
in Section 6.2.1. The Pre-Program FTEs shall engage in research activities
supporting Mitotic Kinesin Target efforts that have not yet reached [*] Program
status, in accordance with the Research Plan. No activities

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funded by GSK under Section 6.2 shall be directed to research on CK Targets, CK
Compounds or CK Products once they have been designated as such.

            2.6.2 [*] Program Activities.

                  (a) From time to time, [*] may establish a formal [*] Program
to be conducted on a collaborative basis by CK and GSK to focus resources on a
particular Mitotic Kinesin Target. Should [*] establish such a [*] Program with
respect to a Mitotic Kinesin Target, it shall notify the JRC of the
establishment of the [*] Program, and shall keep the JRC fully informed of its
activities under the [*] Program. In such event, the JRC will decide upon the
division between GSK and CK of responsibilities pertaining to such [*] Program.
Upon the establishment of such a [*] Program, the Research Plan shall be
modified to reflect such division, and the additional resources to be added,
which shall include additional FTEs at CK (i.e., in addition to the Pre-Program
FTEs) (such additional FTEs being referred to as "[*] Program FTEs"); provided
that, except as provided in Section 2.6.2(b) for KSP, the additional [*] Program
FTEs for any particular [*] Program shall not exceed [*] ([*]) FTEs unless
otherwise agreed by GSK and CK. The decision of whether to establish a [*]
Program with respect to a particular Mitotic Kinesin Target shall be in the [*]
of [*] (except with respect to KSP in Contract Year One, as described in Section
2.6.2(b) below); provided, however, if at any point in time GSK assigns
medicinal chemistry personnel (other than CK FTEs) at the rate (i.e., a running
rate) of [*] ([*]) full-time equivalents, to perform activities relating to such
Target, a [*] Program shall be deemed to have been established with respect to
such Target. It is anticipated that, if the Research Program is successful and
[*] establishes multiple [*] Programs, then the number of CK FTEs will increase
above the minimum CK FTEs required under 2.6.1 above.

                  (b) Notwithstanding the foregoing, the Parties agree that a
[*] Program has been established with respect to KSP, which shall continue
through at least the end of Contract Year One. The Research Plan for Contract
Year One shall, unless otherwise agreed, provide for [*] ([*]) CK [*] Program
FTEs dedicated to KSP (i.e., in addition to the [*] CK FTEs described above, for
a total of [*] CK FTEs in Contract Year One). Following Contract Year One, the
JRC shall determine the appropriate level of [*] Program FTEs, not to exceed [*]
FTEs, to be dedicated to KSP in subsequent periods, based on the activities
remaining and the capabilities of CK to perform those activities.

            2.6.3 Maximum FTEs. Notwithstanding Sections 2.6.2(a) and (b) above,
in no event will GSK's aggregate funding obligations for [*] Program FTEs and
Pre-Program FTEs at CK, added together, exceed [*] ([*]) FTEs at CK in any year
of the Research Term, unless mutually agreed. Notwithstanding any of the
foregoing, unless otherwise agreed by CK and GSK, the Research Plan may not at
any time require more than [*] ([*]) CK FTEs performing synthetic and analytical
chemistry.

            2.6.4 Gene Therapy; Antisense. During Contract Year One, CK and GSK
shall discuss a broadening of the Research Plan to include activities
specifically directed at the discovery and development of Gene Therapy Products
and/or Antisense Products as inhibitors of Mitotic Kinesin Targets. The JRC
shall include the broadening of the Research Plan as a priority for discussions
at its initial meetings after the Effective Date. The Parties shall negotiate in
good faith,

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using commercially reasonable efforts to reach agreement on the terms of such
broadening of the Research Plan. The agreement between the Parties to broaden
the Research Plan under this Section shall take into consideration the research
funding, milestones and royalty payments already agreed to by the Parties under
this Agreement. If the Parties mutually agree in writing on such a modification
of the Research Plan prior to the first anniversary of the Effective Date, then
the Research Plan shall be modified as so agreed, Gene Therapy Products and
Antisense Products shall remain within the Field, and the Parties shall
negotiate additional collaboration terms for such area. Agreement on such an
expanded Research Plan and collaboration may be conditioned upon a commitment by
GSK to include, throughout the Research Term, sufficient resources to diligently
pursue such discovery and development activities. If by the first anniversary of
the Effective Date the Parties have not agreed in writing on such a modification
of the Research Plan and Agreement, then (notwithstanding Section 1.29 above)
for all purposes of this Agreement the Field shall exclude the use of Gene
Therapy Products and Antisense Products for any therapeutic purpose, and shall
also exclude any diagnostic product for use in connection with such Gene Therapy
Products or Antisense Products.

            (a) If the parties fail to reach agreement on such broadening of the
Research Plan and Agreement by the end of Contract Year [*], CK may enter into a
collaboration and license or other agreement with one or more Third Parties for
[*] and/or [*], alone or in combination, after Contract Year [*], subject to
Section 2.6.4(b) below, but GSK shall receive a royalty under Section 4.7 based
on CK's use, or that of its licensees, if any, of [*] generated under the
Research Program.

            (b) At least [*] ([*]) days prior to CK's first grant to a Third
Party of a right to develop, manufacture, sell and distribute (i) both at least
[*] ([*]) [*] and at least [*] ([*]) [*], or (ii) at least [*] ([*]) [*], but no
[*], or (iii) at least [*] ([*]) [*], but no [*], CK will notify GSK in writing
of its intent to grant such rights and a summary of the terms upon which it then
wishes to grant such rights ("Initial Notice"). A grant described in (i) above
is referred to as a "Combination License," and a grant referred to in either
(ii) or (iii) is referred to as a "Field-Specific License." CK shall provide one
(1) Initial Notice with respect to a proposed Combination License or one (1)
Initial Notice each for each of the two categories of Field Specific License. It
is understood and agreed that CK shall not be required to submit more than one
(1) Initial Notice to GSK with respect to [*] collectively on the one hand, or
more than one (1) Initial Notice to GSK with respect to [*] collectively on the
other hand.

                        (A) Upon request by GSK within [*] ([*]) days after
receiving an Initial Notice, CK and GSK will, during the [*] ([*]) day period
following the date of the Initial Notice (the "Negotiation Period"), negotiate
the granting of rights to GSK under the Combination License or Field Specific
License, as applicable. It is understood that any such grant of rights to GSK is
subject to agreement between the Parties on the financial terms and other
conditions of such grant. If CK provides an Initial Notice to GSK (x) with
respect to a Field Specific License, GSK shall have the right to negotiate with
CK for a Combination License or (y) with respect to one product within [*] or
[*], as applicable, GSK shall have the right to negotiate with CK for a
Field-Specific License to [*] or [*], as applicable, or to a Combination
License. In the event GSK requests to negotiate a category of License as
described in (x) or (y), then the Initial Notice shall be deemed to have been
for that category of License (i.e., Combination License, Field-Specific License
for [*] or Field-Specific License for [*], as the case may be).

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                        (B) If for any reason the Parties do not agree upon and
enter into an agreement for the grant of rights to GSK by the end of the
Negotiation Period, CK shall have no further obligations to GSK under this
Section 2.6.4 to provide an Initial Notice (x) with respect to any [*] or [*] in
the case of an Initial Notice regarding a Combination License, (y) with respect
to any [*] in the case of a Field-Specific Licensed described in Section
2.6.4(b)(ii) above, or (z) with respect to any [*] in the case of a
Field-Specific License described in Section 2.6.4(b)(iii) above; except in each
case for CK's royalty obligations under Section 4.7 (as they may apply to [*]
and [*] as if the resultant product were a CK Product).

                  (c) At such time as (i) CK has delivered an Initial Notice for
either (y) one (1) Combination License or (z) one (1) Field-Specific License for
[*] and one (1) Field-Specific License for [*], whichever occurs first, and (ii)
the Negotiation Period, if any, corresponding to each Initial Notice described
above has expired (or the Parties have agreed upon and entered into an agreement
concerning the subject matter of such Initial Notice), then all obligations of
CK under this Section 2.6.4 shall terminate. It is understood that the Parties'
obligations under this Section 2.6.4 are limited to those expressly stated
herein, and neither GSK nor CK shall have any further obligation, implied or
otherwise, other than the obligations expressly stated herein.

                  (d) For such purposes, (i) "[*]" shall mean [*] for the
treatment or [*] of a disease [*], via [*] or [*] methods, of compositions
comprising a [*] that [*] and [*] a moiety, wherein such moiety serves a
material function in the treatment or [*] of such disease; and (ii) "[*]" shall
mean [*] for the treatment or [*] of a disease comprising [*] which modulates
[*] by [*]; in each of cases (i) and (ii) where such [*], as known by CK at the
time of the grant of rights subject to this Section 2.6.4, is to inhibit the
function of a Mitotic Kinesin Target.

      2.7 Collaboration Targets. The Parties acknowledge that CK's technology
with respect to the Mitotic Kinesin Targets and the research conducted under the
Research Program could potentially provide a large number of Mitotic Kinesin
Targets and Compounds on which to focus further research and development
activities, and that, under the collaboration, the Parties will focus their
resources on particular Mitotic Kinesin Targets to be selected by GSK as
Collaboration Targets in accordance with this Section 2.7. Those Mitotic Kinesin
Targets designated as CK Targets in accordance with this Section may be pursued
independently by CK, subject to GSK's rights under Section 4.5 below, it being
understood that GSK will perform no additional research or development on or
commit additional resources to such CK Targets (unless GSK exercises its right
with respect to a CK Product under Section 4.5 below).

            2.7.1 Initial Selection of Collaboration Targets. Upon the later to
occur of (i) the Completion of Screening for [*] ([*]) Mitotic Kinesin Targets
or (ii) [*] days after the end of Contract Year [*] (the "Lead Target Selection
Date"), the JRC will reasonably determine the number of Mitotic Kinesin Targets,
other than [*], for which at least one Tractable Compound has been identified (a
"Lead Target"); provided, however, if [*] establishes a [*] Program with respect
to a particular Mitotic Kinesin Target, such Target shall be deemed a Lead
Target. If the number of such Lead Targets is [*] or less, then all such Lead
Targets shall be Collaboration Targets. If the number of Lead Targets is [*] or
greater, then the Parties shall make the initial selection of Collaboration
Targets and CK Targets, as set forth in Sections 2.7.1(a) and (b) below (with
all of the Lead Targets

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that have been identified as of the Lead Target Selection Date identified above
being referred to as the "Initial Lead Target Pool").

                  (a) On the Lead Target Selection Date, the Parties shall
select as Collaboration Targets and CK Targets that number of Lead Targets
corresponding to the total number of Lead Targets in the Initial Lead Target
Pool as set forth in the following table, with such selection proceeding in the
manner described in Section 2.7.1(b) and (c) below.

<TABLE>
<CAPTION>
Total Lead Targets           Collaboration Targets              CK Targets
<S>                          <C>                                <C>
       [*]                            [*]                          [*]
       [*]                            [*]                          [*]
       [*]                            [*]                          [*]
       [*]                            [*]                          [*]
       [*]                            [*]                          [*]
       [*]                            [*]                          [*]
       [*]                            [*]                          [*]
       [*]                            [*]                          [*]
       [*]                            [*]                          [*]
       [*]                            [*]                          [*]
       [*]                            [*]                          [*]
       [*]                            [*]                          [*]
       [*]                            [*]                          [*]
</TABLE>

                  (b) In applying the foregoing table on the Lead Target
Selection Date, [*] shall be entitled to select the first [*] ([*]) [*]. After
[*] has made such selection, [*] may select [*] ([*]) Lead Target as [*]. This
initial selection shall progress sequentially through the table,
Lead-Target-by-Lead-Target, until all Lead Targets in the Initial Lead Target
Pool have been selected by GSK and CK based on the number of Collaboration
Targets and CK Targets assigned to each under the table. For example, if there
are [*] ([*]) Lead Targets in the Initial Lead Target Pool, [*] shall first
select [*] ([*]) [*], [*] shall then select [*] ([*]) [*], [*] shall then select
[*] ([*]) more [*], and [*] shall then select [*] ([*]) additional [*].

                  (c) [*] shall notify [*] of its first selection no later than
[*] ([*]) days after the Lead Target Selection Date, and thereafter each Party
shall make its next selections sequentially, as described in paragraph (b)
above, within [*] ([*]) business days after the other Party completes its
selection. In the event that a Party (the "Selecting Party") fails to make such
selection within such [*]-day or [*]-business day period, as applicable, and
again fails to make such selection within [*] ([*]) business days of a further
written request to do so, the other Party shall have the right to make such
selection on behalf of the Selecting Party by so notifying the Selecting Party
of such selection, and such selection shall be deemed the selection of the
Selecting Party for purposes of this Section 2.7.

                  (d) Upon each selection in accordance with this Section 2.7,
the particular Lead Target shall be deemed a Collaboration Target or a CK
Target, as the case may be.

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                  (e) [*]. For purposes of clarity, it is understood that [*]
shall not be included in the total Lead Targets or the Initial Lead Target Pool,
nor shall [*] be subject to the selection mechanism of these Sections 2.7.1 and
2.7.2. [*] shall be deemed a Collaboration Target as of the Effective Date,
except to the extent otherwise provided in this Agreement.

                  (f) If the total number of Lead Targets in the Initial Lead
Target Pool or thereafter exceeds [*] ([*]), then for all purposes of this
Section 2.7, the table above shall be deemed to be extended in the same pattern
as such table progressed from [*] ([*]) Lead Targets to [*] ([*]) Lead Targets.
For example, if there are [*] ([*]) Lead Targets, [*] would be entitled to [*]
([*]) [*] and [*] would be entitled to [*] ([*]) [*].

            2.7.2 Subsequent Selections.

                  (a) After all of the Lead Targets have been selected from the
Initial Lead Target Pool, then within [*] ([*]) days after each subsequent point
in time as the JRC has identified [*] ([*]) additional Lead Targets (i.e., other
than [*] and the Lead Targets previously selected in accordance with this
Section 2.7), and in any event at the end of Contract Year Five, the Parties
shall make further selections of Collaboration Targets and CK Targets, with [*]
selecting [*] ([*]) [*], and with the [*] being designated as [*] (subject to
paragraphs (b) and (c) below). For example, if [*] ([*]) Lead Targets were in
the Initial Lead Target Pool, when [*] ([*]) additional Lead Targets are
identified, [*] shall first select [*] ([*]) Lead Target as [*], and the [*]
Lead Target shall be [*].

                  (b) Notwithstanding the foregoing, until such time as a total
of at least [*] ([*]) Lead Targets have been identified, then the selection of
such Lead Targets shall proceed in accordance with Section 2.7.1 above as if
such Lead Targets had been in the Initial Lead Target Pool (i.e., so that [*]
will have the right to select the first [*] Lead Targets as [*], and [*] shall
have the right to select the [*] Lead Target as [*]).

                  (c) If there is only one (1) unselected Lead Target at the end
of Contract Year Five, then that Lead Target shall be designated as a
Collaboration Target or a [*], depending on which Party is then due a Lead
Target, based on the table above.

            2.7.3 Reversion of Unselected Targets; Selection during Section
2.8.2 Extension.

                  (a) It is understood that any Unselected Target shall be
deemed a CK Target at the end of Contract Year Five, unless the Research Term is
extended with respect to Unselected Targets under Section 2.8.2 below, or, if
the Unselected Target is an Extendable Unselected Target and such Target becomes
an Extended Target under Section 4.2.2 below.

                  (b) If the Research Term is extended with respect to
Unselected Targets in accordance with Section 2.8.2 below, and a particular
Unselected Target is identified as a Lead Target during the period of such
extension, such Lead Target shall be selected as a Collaboration Target or CK
Target in accordance with the table in Section 2.7.1 above, taking into account
all of the Lead Targets previously so selected under Section 2.7.1 or 2.7.2
above, or under this Section 2.7.3. Such selections shall be made in a
sequential fashion, progressing through the table Lead Target-by-Lead Target, as
each such Lead Target is identified (i.e., such selection shall not

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progress on the basis of each [*] Lead Targets in the manner described in
Section 2.7.2 above). Any Unselected Target that has not been identified as a
Lead Target by the end of the extended Research Term under Section 2.8.2 shall
be deemed a CK Target, unless such Unselected Target becomes an Extended Target
under Section 4.2.2 below.

                  (c) If an Extendable Unselected Target becomes an Extended
Target under Section 4.2.2 below, and such Extended Target is identified as a
Lead Target during the Extension Period for such Target, the same shall
automatically be deemed a Collaboration Target. Otherwise, such Unselected
Target shall become a CK Target as of the end of the last Extension Period for
such Target.

            2.7.4 Completion of Screening. Promptly following the Effective
Date, CK shall disclose to GSK the number of screens against particular Mitotic
Kinesin Targets that it has conducted as of the Effective Date, including those
chemical entities so screened by CK prior to the Effective Date. It is
anticipated that, by the end of Contract Year [*], CK will generate up to [*]
Data Points with respect to each of [*] ([*]) Mitotic Kinesin Targets, unless
the JRC determines and agrees that such Data Points are better allocated
otherwise. The JRC shall specify the number of chemical entities to be screened
with respect to specific Mitotic Kinesin Targets, on a Target-by-Target basis.
GSK shall supply to CK such number of chemical entities and in such quantities
as required by the Initial Research Plan (as defined in Section 2.3.2) in time
for the scheduled screening against a particular Mitotic Kinesin Target prior to
the end of Contract Year [*]. CK shall give priority to screening chemical
entities provided by GSK rather than to chemical entities provided by CK. The
screening requirements outlined in the Initial Research Plan shall be sufficient
to satisfy the Completion of Screening requirement under this Section 2.7 and
screening of such Targets shall be deemed complete for purposes of clause (i) of
Section 2.7.1 above when CK has generated that number of Data Points specified
by the Initial Research Plan for Contract Years [*] through [*], including those
Data Points generated by CK prior to the Effective Date, or such lesser number
as the JRC may agree. It is understood that the JRC may provide for further
screening beyond that level of screening required for Completion of Screening
under this Section 2.7.4, but completion of such further screening shall not be
required to satisfy the requirements of Section 2.7.1(i) above. For purposes of
this Section 2.7.4, a "Data Point" shall be deemed generated when CK has
screened a single, unique chemical entity against a single Mitotic Kinesin
Target (it being understood that such chemical entity may be used to generate a
Data Point for each Mitotic Kinesin Target).

      2.8 Extension of Research Term.

            2.8.1 Collaboration Targets. GSK shall have the right to extend the
Research Term on an annual basis for up to three (3) additional [*] periods
beyond Contract Year Five. To exercise such option, GSK shall so notify CK in
writing at least [*] ([*]) months prior to the expiration of the Research Term
(including any extensions thereof in accordance with this Section 2.8.1). During
any extension of the Research Term under this Section 2.8.1, the Research Plan
shall provide for [*] ([*]) CK FTEs, or a higher number if mutually agreed,
performing activities with respect to Collaboration Targets under the Research
Program, funded by GSK at the FTE rate established under Section 6.2.1 below. It
is understood that, during any extension under this Section 2.8, the Research
Program shall be limited to research and development activities directed to
Collaboration Targets, except as provided under Section 2.8.2 below. In the
event that the Research Term ends at any point in time,

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then from and after such time GSK shall have no further right to extend the
Research Term under this Section 2.8.1.

            2.8.2 Unselected Targets.

                  (a) Except as provided in this Section 2.8.2, or as provided
in Section 4.2.2 below, all Mitotic Kinesin Targets that have not been
designated Collaboration Targets by the end of Contract Year Five shall at that
time become CK Targets.

                  (b) Notwithstanding (a) above, if GSK has extended the
Research Term for a particular Contract Year in accordance with Section 2.8.1
above, GSK may also extend the Research Term with respect to all Unselected
Targets for such Contract Year, to the extent provided in this Section 2.8.2.
GSK shall have the right to extend the Research Term under this Section 2.8.2
for up to three (3) additional [*] periods beyond Contract Year Five, provided
GSK has extended the Research Term under Section 2.8.1. To exercise such option,
GSK shall so notify CK in writing at least [*] ([*]) months prior to the
expiration of the Research Term (including any extensions thereof in accordance
with this Section 2.8.2(b)). During any extension of the Research Term under
this Section 2.8.2, the Research Plan shall provide for [*] ([*]) CK FTEs, or a
higher number if mutually agreed, performing activities with respect to
Unselected Targets under the Research Program, funded by GSK at the FTE rate
established under Section 6.2.1 below (i.e., [*] additional FTEs beyond those
required by Section 2.8.1 above, for a combined total of at least [*] CK FTEs
being funded by GSK under both Sections 2.8.1 and 2.8.2). In the event that GSK
does not extend the Research Term for any Contract Year with respect to all
Unselected Targets in accordance with this Section 2.8.2, then from and after
such time GSK shall have no further right to extend the Research Term under this
Section 2.8.2.

                  (c) In the event GSK extends the Research Term in accordance
with this Section 2.8.2, then any Unselected Targets that have not been
designated Collaboration Targets prior to the end of the last extension of the
Research Term under this Section 2.8.2 shall at that time become CK Targets,
unless GSK selects such Unselected Target as an Extended Target in accordance
with Section 4.2.2 below.

                  (d) Once an Unselected Target is selected as either a
Collaboration Target or a CK Target, the same shall cease to be an Unselected
Target.

                        ARTICLE III - PRODUCT DEVELOPMENT

      3.1 GSK's Right to Pursue Development.

                  (a) Following the selection of a Development Compound in
accordance with Section 2.5 above, GSK shall be responsible for undertaking a
development program to obtain Marketing Approval for one or more Licensed
Products incorporating such Development Compound. The development program
undertaken by GSK shall include all preclinical, clinical, manufacturing and
other activities, beyond those to be undertaken pursuant to the Research
Program, as are [*] or [*] in [*] and [*] to bring such Licensed Products to
market. Except as provided in Section 3.1(b), and subject to any other
provisions of this Agreement (including without limitation

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Sections 3.2, 3.3, 4.2.1, 7.3 and 11.3.3), GSK shall have the right to make all
decisions relating to the development, marketing and commercialization
activities with respect to any particular Development Compound or Licensed
Product, including whether to continue with the development program with respect
to any Development Compound or Licensed Product or to seek Marketing Approval of
a Licensed Product in a particular country in the Territory.

                  (b) Upon CK's exercise of its Co-Funding Option or GSK's
exercise of the CK Product Option, the JDC shall have the right to make all
decisions relating to the development, marketing and commercialization
activities with respect to any particular Development Compound or Licensed
Product as to which CK has exercised its Co-Funding Option, including whether to
continue with the development program with respect to the Development Compound
or Licensed Product or to seek Marketing Approval of the Licensed Product in a
particular country in the Territory. The JDC shall make decisions in accordance
with the Co-Development Plan and Budget (as described in Section 3.4.2), as such
may be modified by the JDC and all development of Co-Funded Products shall be
performed in accordance with such Co-Development Plan and Budget. All MAAs and
Marketing Approvals for the Licensed Products (other than those for which GSK
acquires rights under Section 4.5 below) shall be owned by GSK, unless otherwise
agreed or provided herein.

            3.1.1 Review of [*] as Potential Development Compound. The Parties
acknowledge that CK has identified and developed certain Compounds, and that the
Compound referred to by CK as [*] may potentially meet the Development Compound
Criteria guidelines set forth in Exhibit 2.5. In addition, the Parties
acknowledge that CK has commenced and is continuing product development
activities with respect to [*], and the Parties have discussed CK's continuing
development program, including the costs thereof, for such Compound. Promptly
after the Effective Date, the JRC shall determine whether and when to recommend
[*] as a Development Compound, and, if the JRC so recommends, [*] shall
determine whether or not to approve [*] as a Development Compound in accordance
with Section 2.5 above, and will notify [*] of its decision, including the
reasons for such decision, it being understood that [*] retains the absolute
right to approve or not approve [*] as a Development Compound.

            3.1.2 Cost of [*] Preclinical Development Prior to Decision. It is
understood that, prior to the Effective Date, CK has been proceeding with
development activities with respect to [*], including activities directed to
compiling data necessary for [*] to consider [*] as a potential Development
Compound. GSK shall have no obligation to reimburse CK for any costs incurred by
CK prior to the Effective Date relating to [*] or other research and development
activities of CK. Notwithstanding the foregoing, GSK agrees to reimburse CK for
the following costs related to [*]: (a) costs associated with [*] incurred after
the Effective Date as set forth in the Research Plan; (b) costs incurred by CK
in accordance with the termination of activities ongoing as of the Effective
Date with those Third Party vendors identified with an asterisk in the Initial
Research Plan, [*]; and (c) if [*] is not approved by [*] as a Development
Compound, [*] percent ([*]%) of costs incurred by CK in accordance with the
termination of activities with those Third Party vendors identified with an
asterisk in the Initial Research Plan. GSK shall have no obligation to reimburse
CK for costs associated with [*] or other research costs other than as set forth
above or as otherwise agreed by the JRC. In establishing the objectives and
activities in the Research Plan with respect to [*], the JRC shall determine
which Third Party agreements relating to [*] to continue or to terminate. In the

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event that [*] approves [*] as a Development Compound, the Parties shall
cooperate to ensure a seamless and rapid transition of further development of
[*] in accordance with the general timelines set forth in the Initial Research
Plan.

      3.2 Project Team. Promptly after approval of each Development Compound,
GSK shall form a project team comprised of GSK personnel that will manage the
conduct and progress of the further development and regulatory affairs with
respect to that Development Compound (each a "Project Team"). Such Project Team
shall meet at least monthly. CK shall be notified at least two weeks in advance
of the date of each Project Team meeting and shall have the opportunity to send,
at CK's cost, [*] to such meeting, who shall be designated as [*] of the Project
Team. GSK shall provide such [*] with schedules for all Project Team meetings
and all other information distributed to GSK members of the Project Team. The
Project Team shall have the responsibility for establishing the plan for the
development of the subject Development Compound (each, a "Development Plan"),
and in so doing shall consider all reasonable suggestions and comments of CK in
formulating such Development Plan. Such Development Plan shall be comprehensive
and shall fully describe at least the proposed activities related to ongoing
preclinical studies, formulation, process development, clinical studies and
regulatory plans, and other activities and timelines directed to obtaining
Marketing Approval in each applicable country. In any event, GSK agrees to keep
CK fully informed as to the material progress and activities relating to the
further development and regulatory matters pertaining to each Development
Compound and Licensed Product. In addition, GSK shall provide CK with such
material information as CK may reasonably request from time to time. It is
understood that such information will include, without limitation, copies of all
proposed trial protocols and material correspondence with regulatory authorities
with respect to each Licensed Product.

      3.3 Manufacturing. Except as provided in Section 3.1.2, GSK shall have the
right and responsibility to arrange for manufacturing of the Licensed Products,
including both clinical materials and commercial product, consistent with GSK's
reasonable internal practices and industry standards. GSK shall make reasonable
commercial efforts to ensure adequate manufacturing capacity to meet forecast
demand for Licensed Products, including, if deemed necessary by GSK, the
establishment of an alternative supply source. GSK shall also make reasonable
commercial efforts to ensure an adequate clinical and commercial supply of such
Licensed Products. GSK will keep the Project Team, the JDC and the JCC, as
applicable, advised of its manufacturing plans and activities.

      3.4 Co-Development Option. CK shall have the right, on a Licensed
Product-by-Licensed Product basis, to elect to fund a portion of the Later Stage
Development Costs of such Licensed Product, all in accordance with this Section
3.4 (the "Co-Funding Option").

            3.4.1 Election. GSK shall notify CK at least [*] ([*]) months, but
not more than [*] ([*]) months, prior to initiation of the first [*] for each
Licensed Product (each, a "[*]"). Such [*] shall include the date by which such
[*] will start (the "Projected Start Date"), and shall include a description in
detail of the indication for which such [*] will be directed, together with a
comprehensive, detailed plan and budget, prepared and provided in good faith,
for the conduct of the Later Stage Development of such Licensed Product, to the
extent such information is not included in or is at variance with the
Development Plan or otherwise has not been communicated previously to

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CK. At least [*] ([*]) days prior to the Projected Start Date, CK may elect, by
so notifying GSK in writing, to participate in the further development of such
Licensed Product, to the extent described in this Section 3.4 below (such
notice, the "Election Notice"). Following the [*], GSK shall cooperate fully
with CK, and shall promptly provide CK with such material information (including
without limitation underlying clinical data), to the extent such information is
not included in the Development Plan or otherwise has not been communicated
previously to CK, as CK may reasonably request to enable CK to make an informed
decision whether to exercise its Co-Funding Option under this Section 3.4 with
respect to such Licensed Product. In the event CK exercises its Co-Funding
Option with respect to a particular Licensed Product (such Licensed Product, a
"Co-Funded Product"), the provisions of Sections 3.4.2 through 3.4.4 below shall
apply with respect to such Co-Funded Product.

            3.4.2 Co-Funding Obligation. In the event CK exercises its
Co-Funding Option with respect to a Licensed Product, CK shall specify in the
Election Notice whether CK elects to fund either [*] ([*]) or [*] ([*]) of the
Later Stage Development Costs for such Licensed Product. The percentage so
specified by CK is referred to as the "CK Percentage" for such Licensed Product.
Following such election, CK shall be obligated to reimburse GSK for the CK
Percentage of such Later Stage Development Costs for such Licensed Product,
subject to the provisions of this Section 3.4.

                  (a) The comprehensive development plan and budget provided
with the [*], as modified in accordance with this Section 3.4.2(a), is referred
to as the "Co-Development Plan and Budget." By October 1 of each year during the
Later Stage Development for a particular Co-Funded Product or such other date as
is mutually agreed by the Parties (which will be established under Section 3.5
below), the JDC shall update and amend the Co-Development Plan and Budget for
such Co-Funded Product for the next succeeding year. Unless otherwise specified
in the Co-Development Plan and Budget, any amounts projected for a full year
shall be considered budgeted in four equal quarterly amounts.

                  (b) Within sixty (60) days after CK exercises its Co-Funding
Option with respect to a Licensed Product, but in any event prior to the
initiation of the first [*] for such Licensed Product, CK and GSK shall
establish specific reasonable Later Stage Development Costs invoicing and
payment procedures. Such procedures shall include the form of invoice, overall
documentation requirements and accounting methodologies for Later Stage
Development Costs, and specific documentation of costs required with each
invoice. Within sixty (60) days after the end of each calendar [*], GSK shall
provide to CK a statement reflecting the total Later Stage Development Costs
incurred by GSK during such calendar [*] with respect to the particular
Co-Funded Product. Within sixty (60) days after CK's receipt of such statement,
CK shall reimburse GSK for the CK Percentage of Later Stage Development Costs
incurred by GSK during such [*] period in accordance with the Co-Development
Plan and Budget for such Co-Funded Product. CK may elect to defer payment, in
whole or in part, of any amount due under this Section 3.4.2(b) for up to an
additional [*] ([*]) months after such payment would otherwise have been due, by
providing notice to GSK of the amount for which payment is to be deferred and
the period of the deferment. Any payment amount so deferred shall bear interest
at a rate of [*] percent ([*]%) per annum, calculated on the number of days from
the end of the [*] day period after the calendar [*] in which such Later Stage
Development Costs were incurred, until the date paid by CK. GSK agrees to keep
CK informed on

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an ongoing basis as to the actual Later Stage Development Costs incurred to date
as compared to the Later Stage Development Costs reflected in the Co-Development
Plan and Budget.

                  (c) Notwithstanding the foregoing, CK shall not be obligated
to reimburse GSK for amounts greater than [*] percent ([*]%) in excess of the
Later Stage Development Costs provided in (i) the then-current Co-Development
Plan and Budget, or (ii) the Development Plan and Budget provided with the [*],
whichever is lower (the CK Percentage of such excess amounts being referred to
as the "Deferred Excess Amount") in accordance with the time periods and
schedule set forth in Section 3.4.2(b). In the event that CK elects not to
reimburse such Deferred Excess Amount in accordance with the time periods and
schedule set forth in Section 3.4.2(b), then, at GSK's option either (i) CK
shall repay such Deferred Excess Amount on the [*] anniversary of the date such
Deferred Excess Amount would otherwise have been payable under paragraph (b)
above, together with interest thereon at the rate of [*] percent ([*]%) per
annum, calculated from the date such Deferred Excess Amount would have been so
due under paragraph (b); or (ii) GSK shall be entitled to credit such excess
costs, plus interest at a rate of [*] percent ([*]%) per annum, calculated from
the date such costs would have otherwise been due, against royalties payable
under Section 6.6.2 with respect to such Co-Funded Product. GSK shall make such
election with respect to all Deferred Excess Amounts for a particular Co-Funded
Product by so notifying CK within sixty (60) days after the date CK first elects
to defer a Deferred Excess Amount under this Section 3.4.2(c) for such Co-Funded
Product. In the event of (i), CK may repay such Deferred Excess Amount earlier
than the date it would be payable under (i) above, without penalty, and with
interest only accruing until the date so paid by CK.

                  (d) In the event CK assigns this Agreement to [*] US Dollars
($[*]), or in the event that CK merges or consolidates or concludes a similar
transaction with such a pharmaceutical or biotechnology entity, in which such
entity becomes an Affiliate of CK, CK's ability to defer any payments due under
Section 3.4.2(b) or (c) shall terminate, and CK shall reimburse GSK for all past
payments due, including applicable interest thereon, within ninety (90) days
after the closing of such acquisition, merger or consolidation.

                  (e) Upon [*] ([*]) months written notice to GSK, CK may
terminate its Co-Funding Option for a particular Co-Funded Product. In such
event, CK's funding obligation under Section 3.4.2(b) above shall apply only
with respect to Later Stage Development Costs of activities conducted with
respect to such Co-Funded Product prior to the date of such termination. Should
CK terminate its Co-Funding Option under this Section, any royalties payable to
CK on the Licensed Product shall be paid in accordance with Section 6.6.2(c). If
CK terminates its Co-Funding Option under this Section, it shall relinquish any
right to its Co-Promotion Option under Section 7.4 with respect to such
Co-Funded Product.

            3.4.3 Certain Terms. As used in this Section 3.4, the following
terms shall have the meaning set forth below:

                  (a) "Later Stage Development" shall mean [*] and [*] and other
development activities described below, specifically directed to the development
of a Co-Funded Product, which are directed specifically towards achieving [*] or
maintaining [*] of a Co-Funded Product or achieving an [*] or [*] for a
Co-Funded Product, whether such studies are conducted by

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[*] or by an [*]; provided, however, that [*] focusing on [*] not included in
the [*] for the Co-Funded Product and not used for submission of an [*] or [*]
for the Co-Funded Product shall also be included in Later Stage Development if
the results of such study are published in a peer-reviewed journal. Later Stage
Development shall also include (i) the [*] of [*] and [*] for such [*] and [*];
provided, however, that if the amounts of [*] for [*] are used for [*] of the
[*], [*] shall be [*] for the cost of any amounts [*]; (ii) [*] and [*]
development activities commenced after the initiation of the [*] for the [*]
specifically directed to the Co-Funded Product, including [*] or clinical [*] or
[*] studies, [*] and other clinical testing, for such purpose; provided,
however, that the costs of activities described in this item (ii) to be included
within Later Stage Development Costs (other than [*] tests required to [*] a [*]
clinical trial), shall be limited to [*]% of the total Later Stage Development
Costs for such Co-Funded Product in a given [*] period; and (iii) that portion
of [*] development directed specifically towards achieving [*] of a Co-Funded
Product or achieving an [*] or [*] for a Co-Funded Product; and (iv) the
preparation and filing of [*] and all associated [*] activities to achieve [*],
maintain [*] or achieve an [*] or [*] for a Co-Funded Product, including the
[*]. "Later Stage Development" shall exclude (i) [*] development not included in
(iii) above; and (ii) any activities of the [*] and [*] of GSK and associated
[*]. As used herein, "[*]" shall mean the [*]-approved [*] required to [*] the
Licensed Product that contains [*].

                  (b) "[*]" clinical trials shall mean any [*] clinical trials
of a Co-Funded Product conducted after [*] of such Co-Funded Product, by GSK or
a Third Party, to the extent GSK collects or receives the data generated in such
trials, performs statistical analysis with respect to such data, with the
intention of using the data to determine [*] or [*] for the Co-Funded Product or
supporting the [*] and [*] of such Co-Funded Product. [*] clinical trials shall
specifically exclude [*] programs sponsored by GSK, [*] programs and grants
(other than those grants extended by GSK to investigators to support [*]
clinical trials).

                  (c) "Later Stage Development Costs" with respect to a
particular Co-Funded Product shall mean, to the extent incurred in accordance
with the Co-Development Plan and Budget then in effect and to the extent not
reimbursed by a Third Party: (i) amounts paid to Third Parties for their
performance of Later Stage Development of the particular Co-Funded Product; (ii)
[*] conducting such Later Stage Development, plus [*] for such [*], [*] directly
attributable to such Later Stage Development; and (iii) [*] to the conduct of
Later Stage Development, including [*] of [*] for [*] in Later Stage
Development; plus in each of cases (i), (ii) and (iii), a reasonable allocation
of [*] costs attributable to the particular Co-Funded Product (subject to
paragraph (d) below). [*] costs attributable to a Co-Funded Product may include
a reasonable allocation of [*] labor, a reasonable allocation of [*] costs, and
a reasonable allocation of [*] costs including [*] cost, [*], and [*] over the
[*] of [*] and [*], and such allocations shall be in accordance with reasonable
cost accounting methods, consistently applied by GSK for its own internal
accounting. [*] shall not include corporate [*] or [*] costs not otherwise
allocable to the [*] of the Co-Funded Product or costs associated with [*] not
incorporated into [*] costs, and [*] costs shall exclude costs associated with
[*] and [*]. It is understood that Later Stage Development Costs shall not
include any cost of activities undertaken prior to CK's exercise of its
Co-Funding Option, and shall not include any costs incurred with respect to
activities directed to [*] of a Co-Funded Product, or to [*], or to activities
not specifically directed to achieving [*], maintaining [*] or achieving an [*]
or [*] for a Co-Funded Product in an attempt to enhance Net Sales of the
Co-Funded Product and the resulting royalties to CK.

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                  (d) In no event, however, shall the total [*] included within
Later Stage Development Costs exceed [*] percent ([*]%) of the costs described
in (i), (ii) and (iii) of Section 3.4.3(c) above.

                  (e) For purposes of this Section 3.4, a particular "Co-Funded
Product" shall include all dosages of any formulation of the same active
ingredient for all indications within the Field. Licensed Products having a
different or additional active ingredient shall be deemed a separate Licensed
Product (or a separate Co-Funded Product, as the case may be).

            3.4.4 Certain Disputes. The Parties shall attempt to timely resolve
any dispute with respect to whether a cost or expense should be included within
Later Stage Development Costs for a particular Co-Funded Product or is otherwise
obligated to be reimbursed under this Section 3.4. If the Parties are unable to
resolve such dispute, the matter shall be referred to the Chairman, GSK R&D, and
President, CK, for resolution. If such individuals are unable to resolve such
dispute within thirty (30) days after the matter is referred to them, the matter
shall be subject to arbitration under Section 12.3.1 below. Failure by CK to pay
any disputed amount under this Section 3.4 shall not be deemed a breach of this
Agreement unless and until it has been determined in an arbitration proceeding
under Section 12.3.1 below that CK is obligated to pay such disputed amount,
provided that (i) CK makes such payment within thirty (30) days after such
determination or (ii) within such thirty (30) day period CK elects to terminate
its Co-Funding Option for the particular Co-Funded Product in accordance with
Section 3.4.2(e) above, in which case (notwithstanding Section 3.4.2(e)), CK
shall have no obligation to reimburse any Later Stage Development Costs not
previously paid by CK.

      3.5 Joint Development Committee. Promptly following CK's exercise of its
Co-Funding Option for a Co-Funded Product, or an exercise by GSK of the CK
Product Option with respect to a CK Product under Section 4.5 below, the Parties
shall establish a Joint Development Committee ("JDC") with respect to such
Licensed Product. It is understood that the Project Team for such Licensed
Product shall continue after establishment of a JDC and shall report thereto.
The JDC shall have responsibility to oversee the Later Stage Development of the
Co-Funded Product, and all further development of the Licensed Product for which
GSK exercises its CK Product Option under Section 4.5, and to make such
decisions as are expressly provided in this Article III. The JDC shall be
comprised of an equal number of representatives from each of GSK and CK; and
unless otherwise agreed, the JDC shall at all times include CK's head of
development and GSK's head of clinical operations for the CEDD or Therapeutic
Area Strategic Team ("TAST"), as appropriate, and GSK's CEDD head of biology,
unless otherwise agreed, and shall have at least one representative from each
Party at the level of Vice President or above. Either Party may replace its
respective JDC representatives at any time, with prior written notice to the
other Party. From time to time, the JDC may establish subcommittees to oversee
particular projects or activities, and such subcommittees will be constituted as
the JDC approves. The JDC shall meet at least quarterly according to an agreed
schedule, and the Parties shall keep the JDC fully informed as to all aspects of
the Later Stage Development and other ongoing activities pertaining to the
Co-Funded Product and all further development of the Licensed Product for which
GSK exercises its CK Product Option under Section 4.5. Decisions of the JDC
shall be by majority vote; provided that if there is not an equal number of
representatives of each Party present at such meeting, then only an equal number
of representatives of each Party shall be entitled to vote. In the event the
required vote to approve a

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particular action cannot be obtained, then either Party may request that the
issue be referred for resolution through good faith negotiations between the
Chief Executive Officer of CK and the Chairman, Research and Development for
GSK, who shall promptly meet to resolve the issue. In the event they are unable
to reach agreement on the matter, the [*] shall have the right to [*] on the
matter, which [*] shall become the decision of the JDC. Notwithstanding the
foregoing, [*] shall not have the right to [*] with respect to matters relating
to Licensed Products for which [*].

      3.6 Regulatory Matters. Subject to Section 4.4.2, GSK shall file and be
the owner for all regulatory filings for Compounds and/or Licensed Products
developed pursuant to this Agreement, including all MAAs and Marketing
Approvals. Notwithstanding the foregoing, the parties shall agree on which Party
shall file and own regulatory filings for Licensed Products for which [*].

                            ARTICLE IV - EXCLUSIVITY

      4.1 Exclusivity of Efforts.

            4.1.1 Compounds. Except as set forth herein or Exhibit 10.1, during
the Exclusivity Period, neither Party shall conduct, participate in, or fund,
directly or indirectly, alone or with a Third Party, research or development
with respect to, or commercialize a product comprising, a Development Compound,
Compound or Licensed Product within the Field, except pursuant to this
Agreement. In addition, neither Party shall, during the Exclusivity Period,
without the consent of the JRC or the other Party, hold any discussion with any
Third Party relating to any of the foregoing activities, regardless of whether
such activities would take place during or after the Exclusivity Period, except
as permitted under this Agreement.

            4.1.2 Activities Directed to Mitotic Kinesin Targets. Except as set
forth herein or Exhibit 10.1, during the Exclusivity Period, neither Party shall
conduct, participate in, or fund, directly or indirectly, either alone or with a
Third Party, any research, development, or commercialization activities in the
Field with respect to the Mitotic Kinesin Targets, including Collaboration
Targets, except pursuant to the Agreement. In addition, during the Exclusivity
Period, neither Party shall disclose to a Third Party any CK Existing
Technology, GSK Existing Technology, Collaboration Technology or
Post-Collaboration Technology relating to Mitotic Kinesin Targets to the extent
prohibited under Section 9.5. Subject to the foregoing and the confidentiality
obligations set forth in Article IX, (i) CK shall have the right to use Mitotic
Kinesin Targets, and information relating thereto other than Compounds, for
general technology development purposes, including but not limited to the
development of assay, informatics, and expression technologies, and (ii) either
Party shall have the right to use Mitotic Kinesin Targets, including CK Targets
and Collaboration Targets, and information relating thereto, for the generation
of negative control information outside the Research Program.

            4.1.3 Retention of Rights.

                  (a) For avoidance of doubt, it is understood that this Section
4.1 shall not limit CK's activities relating to CK Targets, CK Compounds, and CK
Products.

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                  (b) Notwithstanding Section 4.1.1, each Party retains the
right to conduct, participate in, or fund, directly or indirectly, alone or with
a Third Party, research or development with respect to, or to commercialize a
product comprising (i) with respect to GSK, a GSK Library Compound, and (ii)
with respect to CK, a CK Library Compound, in each case where the primary mode
of pharmacological action of such compound is not through inhibition of one or
more Mitotic Kinesin Targets, and without use of Licensed Technology owned (or
Controlled) solely by the other Party; provided, however, that (1) if CK has
progressed a GSK Library Compound to the equivalent stage to a Development
Compound hereunder prior to GSK progressing such GSK Library Compound to a
Development Compound-equivalent stage under this Section 4.1.3(b), the retained
right of GSK under this Section 4.1.3 with respect to such GSK Library Compound
will no longer apply; and (2) if GSK has progressed a CK Library Compound to the
equivalent stage to a Development Compound prior to CK progressing such CK
Library Compound to a Development Compound-equivalent stage under this Section
4.1.3(b), the retained right of CK under this Section 4.1.3 with respect to such
CK Library Compound will no longer apply. Each Party shall notify the other of
their efforts with respect to a GSK Library Compound or CK Library Compound upon
the designation of the compound as a Compound or as a Development Compound
equivalent as described in (i) and (ii) above. This Section 4.1.3 shall not be
deemed to limit in any way any license expressly granted under this Agreement.

                  (c) GSK acknowledges that CK has ongoing research programs
related to non-human mitotic kinesins and the development of pharmaceutical
products for the treatment of human diseases, the mechanism of action of which
is to modulate such non-human proteins. GSK further acknowledges that such
ongoing research programs as well as similar future CK research programs related
to non-human mitotic kinesins are outside the scope of this Agreement and such
activities of CK are not prohibited by this Article IV. Notwithstanding the
foregoing, except for the licenses granted under Section 5.4.2, nothing in this
Agreement shall be construed as a grant to CK of any licenses from GSK under
Licensed Technology for research, development or commercialization of any
products directed to non-human mitotic kinesins; and provided further, that
nothing in this Section shall be construed as a limitation on CK's
confidentiality obligations pursuant to Article IX of this Agreement.

      4.2 Exclusivity Extension.

            4.2.1 [*] Programs. Subject to the provisions of this Section 4.2,
for those Collaboration Targets for which a [*] Program has been designated
during the Exclusivity Period or if such Collaboration Target was an Extended
Target (as defined in 4.2.2(a) below), prior to the end of the Extension Period
for such Target, CK's obligations under Section 4.2.3 below with respect to each
such Collaboration Target shall automatically extend with respect to such
Collaboration Target for so long as GSK is diligently pursuing such [*] Program,
Development Compound or Licensed Product directed to such Collaboration Target;
provided, however, if after the Exclusivity Period or any Extension Period, as
applicable (i) GSK ceases at any time diligent research, development or
marketing of all Compounds and Licensed Products for such Collaboration Target,
or (ii) GSK fails to identify a Compound meeting the guidelines set forth in
Exhibit 2.5 and designate such Compound as a Development Compound for such
Collaboration Target before the second anniversary of the expiration of the
Exclusivity Period, or in the case of a Collaboration Target that was an
Extended Target, before the second anniversary of the end of the Extension
Period for such

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Target, then CK's obligations under Section 4.2.3 shall terminate with respect
to such Target. GSK shall keep CK informed of its progress and activities
pertaining to all Collaboration Targets, Extended Targets and Extendable
Unselected Targets, and any Compounds, Development Compounds or Licensed
Products directed thereto.

            4.2.2 Option to Extend Exclusivity; Exercise.

                  (a) Subject to paragraph (d) below, GSK has the option to
extend CK's obligations under Section 4.2.3 below with respect to a particular
Collaboration Target or Extendable Unselected Target (as described in paragraph
(e) below), on a Target-by-Target basis for up to an additional two (2) years,
all to the extent set forth in Section 4.2.3 below. The option fee shall be [*]
U.S. Dollars (U.S. $[*]) per annum per Collaboration Target or Extendable
Unselected Target, as applicable. To exercise such right:

                        (i) with respect to a Collaboration Target that was
selected as a Collaboration Target prior to the end of the initial five-year
Research Term or any extension thereto under Section 2.8.1, GSK shall so notify
CK in writing at least ninety (90) days prior to the end of the Exclusivity
Period; and

                        (ii)with respect to an Extendable Unselected Target, GSK
shall so notify CK in writing at least ninety (90) days prior to the end of the
initial five-year Research Term or any extension thereto under Section 2.8.2. In
the event that an Extendable Unselected Target becomes a Collaboration Target
during an Extension Period for such Target, it is understood that clause (i)
above shall not apply (i.e., because such Extendable Unselected Target was not a
Collaboration Target at the end of the Research Term).

                        (iii) Each such notice shall specify the Collaboration
Target(s) or Extendable Unselected Target(s) for which GSK elects to exercise
its right under this Section 4.2.2, and include payment in the amount of [*]
U.S. Dollars (U.S. $[*]) for each Collaboration Target(s) or Extendable
Unselected Target(s) for which GSK exercises its rights under this Section 4.2.
Upon such exercise, such Collaboration Target(s) or Extendable Unselected
Target(s) shall be deemed an "Extended Target" for a period of [*] from such
anniversary date.

                  (b) After the first one-year extension for a particular
Extended Target under (a) above, subject to paragraph (d) below, GSK may
maintain such Extended Target as an Extended Target for one additional one (1)
year period beginning at the end of the first Extension Period, by so notifying
CK in writing, and paying to CK the amount of [*] U.S. Dollars (U.S. $[*]) for
each Extended Target for which GSK seeks such a continued extension, at least
ninety (90) days prior to the end of the first Extension Period.

                  (c) In the event that the Extension Period lapses at any time
with respect to a particular Collaboration Target or Extendable Unselected
Target, then GSK shall have no further rights, and CK shall have no further
obligations, under this Section 4.2 with respect to such Collaboration Target or
Extendable Unselected Target, and such Collaboration Target or Unselected Target
shall not be deemed an Extended Target for any period thereafter and shall be
deemed a CK Target. If GSK establishes, prior to the end of the Extension Period
for an Extended Target, a [*]

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Program, then Section 4.2.1 shall apply; provided that, in the case of an
Extended Target that is an Extendable Unselected Target, such Extended Target
has first been designated as a Collaboration Target in accordance with Section
2.7.3 above.

                  (d) Notwithstanding the foregoing provisions of this Section
4.2.2, if GSK extends the Research Term for two (2) years under Section 2.8.1
above, GSK may only extend its rights under Section 4.2.3 below with respect to
Collaboration Targets and Extendable Unselected Targets for a single one-year
Extension Period under this Section 4.2.2 (i.e., so that in such event GSK shall
not have the right to an additional extension under paragraph (b) above); and if
GSK extends the Research Term for three (3) years under Section 2.8.1 above, GSK
shall not have any right to extend its rights with respect to any Collaboration
Target or Extendable Unselected Target.

                  (e) The Unselected Targets for which GSK may extend its rights
under Section 4.2.3 below ("Extendable Unselected Targets"), in accordance with
this Section 4.2.2 shall be determined as follows: Prior to the time specified
in paragraph (a)(ii) above for GSK to so extend such rights, GSK and CK shall
allocate the Unselected Targets then remaining (the "Unselected Target Pool")
into Extendable Unselected Targets and CK Targets, in the same manner as the
Parties selected Collaboration Targets and CK Targets from Lead Targets under
Section 2.7.3 above, progressing sequentially through the table in Section
2.7.1, as if such Extendable Unselected Targets were Collaboration Targets and
as if such Unselected Targets were Lead Targets. It is understood that such
selection shall begin at the point in the table where the last selection of a
Collaboration Target or CK Target, as the case may be, was made under Section
2.7. For example, if there had been [*] ([*]) Lead Targets during the Research
Term (including any extension thereto), and there remain [*] ([*]) Unselected
Targets in the Unselected Target Pool, then [*] shall have the right to make the
first selection of [*] from such Unselected Target Pool, then [*] would have the
right to select [*] ([*]) [*] as a [*], [*] would then have the right to select
[*] ([*]) additional [*] from the Unselected Target Pool, and [*] would have the
right to select the [*] and [*] Unselected Target as [*]. Upon such selection by
GSK the Unselected Target so selected by GSK shall become an "Extendable
Unselected Target," and upon such selection by CK the Unselected Target shall
become a CK Target.

                  (f) GSK shall not be required to continue, but upon mutual
agreement of the Parties may elect, to fund [*] during the Extension Period.

            4.2.3 CK Obligations for Extended Targets. For so long as GSK's
exclusivity with respect to a particular Collaboration Target or Extended Target
is extended under Section 4.2.1 or Section 4.2.2 above, CK shall not conduct,
participate in, or fund, directly or indirectly, alone or with a Third Party,
any research, development, or commercialization activities in the Field with
respect to such Collaboration Target or Extended Target, as applicable.

      4.3 Certain Other Matters Pertaining to Exclusivity.

            4.3.1 Target Reversion. After the end of the Exclusivity Period or
Extension Period, as applicable, any Collaboration Target or Extended Target
with respect to which CK's activities are no longer restricted under Section
4.2.3 shall cease to be a Collaboration Target, and shall cease to be an
Extended Target, for all purposes of this Agreement, and any such Target shall

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be deemed a CK Target at the conclusion of such Period or such later time as
specified in Section 4.2.1, as applicable, except pursuant to the Agreement.

            4.3.2 GSK Activities. Subject to Section 4.4.2 below, after a
Mitotic Kinesin Target becomes a CK Target, GSK shall not conduct, participate
in, or fund, directly or indirectly, alone or with a Third Party, any research,
development, or commercialization activities in the Field with respect to such
CK Target.

      4.4 Commercialization of CK Targets and Compounds.

            4.4.1 Generally. It is understood that, as provided in this
Agreement, GSK will have control over the selection, development and
commercialization of Development Compounds and Licensed Products. Accordingly,
GSK and CK have agreed that CK has the right to continue, on its own (outside
the Research Program) research, development and other activities relating to CK
Targets, including the identification of CK Compounds and development of CK
Products for commercialization, in accordance with a workplan established by CK.
During the Research Term, CK shall provide quarterly updates to the JRC of the
progress of its activities on CK Targets. Notwithstanding the foregoing, for so
long as GSK's CK Product Option under Section 4.5 below remains in effect with
respect to a CK Compound or CK Product, CK shall retain exclusive rights to such
CK Compound or CK Product sufficient to grant to GSK the rights that GSK is
entitled to receive under Section 4.5 upon GSK's exercise of such CK Product
Option with respect to such CK Compound or CK Product.

            4.4.2 Transition.

                  (a) At such time as a Mitotic Kinesin Target becomes a CK
Target, a compound becomes a CK Compound or a Licensed Product becomes a CK
Product, then from and after such time, GSK shall cooperate fully with CK to
provide CK with all Licensed Technology and Information to which CK has a right
or license under this Agreement and which is necessary or useful for CK to
further research, develop, produce or otherwise exploit such CK Target, CK
Compound or CK Product. Such cooperation shall include (i) the reasonable
disclosure of all such Information, to the extent such information is not within
the possession or control of CK (including, without limitation: [*] with respect
to the CK Compound or CK Product and [*] with respect to CK Products, CK
Compounds or CK Targets, and (ii) to the extent reasonably transferable and
specifically developed or used in connection with the CK Product, CK Compound or
CK Target, transfer of [*] all to the extent that such material is not in the
possession of CK, and such other disclosures and transfers as are reasonably
necessary or useful for CK to exercise its full rights with respect to such CK
Target, CK Compound, or CK Product granted to CK under this Agreement. From and
after such time, all such Information specifically pertaining to the CK
Compounds, CK Products and CK Targets shall be deemed Confidential Information
of CK for purposes (i.e., to the same extent as such information had been first
disclosed to GSK by CK under this Agreement), subject to the exceptions
described in Section 9.1(ii), (iii) or (iv) (but not subject to the exception in
Section 9.1(i)) below. Notwithstanding the foregoing, GSK shall not be
considered to be in breach of this Section 4.4.2 for failure to disclose
information, if, despite [*] efforts, the identification of such information is
impractical or such information is not material. Without limiting the foregoing,
GSK shall use [*] efforts with respect to those activities for which it is
responsible to ensure orderly

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transition and uninterrupted research and development of CK Targets, CK
Compounds or CK Products. CK shall promptly reimburse GSK's [*] costs with
respect to activities and materials provided by GSK under this Section 4.4.2.

                  (b) In addition, GSK shall cooperate fully to transition to CK
upon CK's request any arrangement with any [*] from which GSK had arranged to
[*] of Compounds, Development Compounds or Licensed Products that became a CK
Compound or CK Product hereunder. In the event that such [*], and the CK
Compound has reached a stage equivalent to Development Compound at the time of
its transition, then GSK shall continue to provide CK [*] until the conclusion
of any [*], and shall also [*] a final, reasonable [*] as ordered by CK within
[*] ([*]) days after the date of transition. GSK shall be obligated to [*]
ordered by CK, but only to the extent that GSK, prior to the date of transition,
was [*] at a [*] which would permit [*] run, consistent with GSK's past
practices with respect to such Compound, Development Compound or Licensed
Product that became a CK Compound or CK Product hereunder.

                  (c) In the event that a Mitotic Kinesin Target later becomes a
CK Target, a Compound later becomes a CK Compound, or a Development Compound or
a Licensed Product later becomes a CK Product, for clarity it is understood
that:

                        (i) Any subject matter that would have been within the
GSK Existing Technology, Collaboration Technology or Post-Collaboration
Technology at the time the Mitotic Kinesin Target becomes a CK Target, the
Compound becomes a CK Compound, or the Development Compound or a Licensed
Product becomes a CK Product, but for such event, shall nonetheless continue to
be within the Collaboration Technology, Post-Collaboration Technology or GSK
Existing Technology, respectively, for all purposes of this Agreement. For
example, if GSK makes an invention with respect to a Collaboration Target after
the Exclusivity Period, and then such Collaboration Target becomes a CK Target,
such invention shall continue to be within the Post-Collaboration Technology,
with respect to such CK Target, and with respect to CK Compounds and CK Products
directed to such CK Targets. It is understood that this Section 4.4.2(c)(i)
shall be subject in all respects to paragraph (b) of Section 1.32 above.

                        (ii)The licenses to GSK under Section 5.2 below shall
terminate (A) with respect to any Compound, Development Compound or Licensed
Product that became a CK Compound or CK Product, and (B) with respect to any
Collaboration Target that became a CK Target.

      4.5 GSK Option. For the period commencing on the Effective Date and ending
on the thirteenth anniversary thereof, for those CK Targets selected by CK under
Section 2.7.1 or 2.7.2, and for those CK Targets that become CK Targets as a
result of GSK's failure to designate a Development Compound for such Targets
within the time period specified in clause (ii) of Section 4.2.1, GSK shall have
an option to acquire a worldwide license to CK Compounds and CK Products, all as
described in this Section 4.5 below (the "CK Product Option"). Such Option shall
be exercisable on a CK Product-by-CK Product basis as follows.

            4.5.1 Exercise. At such time as CK has completed [*] ([*]) [*]
clinical trials of a particular CK Product, CK shall notify GSK of such event
(the "CK [*] Notice"), and shall provide

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to GSK a complete copy of the IND filed with the FDA for such CK Product, the
completed clinical trial report in the form and including the information
requested on Exhibit 4.5.1 hereto for the clinical trials of such CK Product as
of the date of the CK [*] Notice, and a statement in detail of the research and
development costs subject to reimbursement under Section 4.5.2 below of the date
of such [*] Notice. Within [*] ([*]) days after receipt of the CK [*] Notice,
GSK shall have the right to exercise the CK Product Option with respect to such
CK Product, by so notifying CK in writing. For purposes of this Section 4.5.1,
"completion" of a [*] trial shall be deemed to have occurred upon the later to
occur of (i) thirty (30) days after the last patient to be treated in such trial
has been dosed, and (ii) receipt by CK of the completed clinical trial report
for such clinical trial in the form and including the information requested on
Exhibit 4.5.1 hereto. Following delivery of the CK [*] Notice to GSK, CK shall
cooperate fully with GSK, and shall promptly provide GSK with such material
information (including without limitation underlying clinical data), to the
extent such information has not been communicated previously to GSK, as GSK may
reasonably request to enable GSK to make an informed decision whether to
exercise its CK Product Option under this Section 4.5. In any case, such
cooperation shall include providing to GSK within [*] ([*]) days after the CK
[*] Notice, a comprehensive, detailed plan and budget for development activities
to be undertaken by CK with respect to such CK Product during the one (1) year
period following the date of the [*] Notice, together with such formal plans as
CK then has produced, if any, for the conduct of [*] trials of such CK Product.
Within [*] ([*]) days after GSK exercises its CK Product Option with respect to
a CK Product, CK shall provide GSK with a statement of the Early Stage R&D Costs
that would be required to be reimbursed by GSK under Section 4.5.2(a) below. In
the event GSK exercises its CK Product Option with respect to a particular CK
Product, the provisions of Sections 4.5.2 through 4.7 below shall apply with
respect to such CK Product.

            4.5.2 Terms of License Upon Exercise of CK Product Option. In the
event that GSK so exercises the CK Product Option with respect to a particular
CK Product, such CK Product shall, upon such exercise, cease to be a CK Product
and shall thereafter be deemed a Licensed Product. In such event:

                  (a) Within [*] ([*]) days after GSK's exercise of the CK
Product Option, GSK shall pay to CK an amount equal to [*] percent ([*]%) of the
research and development costs incurred by CK with respect to such CK Product
outside of the Research Program up to the date of GSK's exercise of the CK
Product Option, as defined in Section 4.5.2(a)(i) and (ii) below (such
activities, the "Early Stage R&D" and such costs, the "Early Stage R&D Costs").

                        (i) The Early Stage R&D Costs incurred by CK for which
CK shall receive reimbursement from GSK under this Section 4.5.2(a) shall only
include those specifically directed to research and development of the CK
Product, to the extent not reimbursed by a Third Party, including the following
costs: (1) costs for the conduct of activities related to [*] of the CK Product
or the CK Compound incorporated in the CK Product; (2) cost for the conduct of
[*] and other [*] for a CK Product; (3) costs specifically related to those
activities intended to [*] and/or [*] or [*] a CK Compound incorporated in the
CK Product, or to [*]; (4) studies related to [*], and other [*] of, or [*] or
[*] of, a CK Product; (5) amounts paid to Third Parties for their performance of
Early Stage R&D of the particular CK Product; (6) [*] conducting such Early
Stage R&D (to the extent [*] under this Agreement), plus [*] for such [*], [*]
directly attributable to such Early Stage R&D; and (7) [*] that are attributable
to the conduct of Early Stage R&D, including [*] specifically

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related to the CK Product; plus (subject to paragraph (ii) below), for such
items other than those in (5) above, a reasonable allocation of [*] costs
attributable to the particular CK Product. [*] costs attributable to a CK
Product may include a reasonable allocation of [*] labor, a reasonable
allocation of [*] costs, and a reasonable allocation of [*] costs including [*]
cost, [*], and [*] over the [*] of [*] and [*], and such allocations shall be in
accordance with reasonable cost accounting methods, consistently applied by CK
for its own internal accounting. [*] shall not include: (a) corporate [*] or [*]
costs not otherwise allocable to the [*] of the CK Product; or (b) costs
associated with [*] not attributable to the Early Stage R&D. The Parties shall
attempt to timely resolve any dispute with respect to whether an item of cost or
expense should be included within Early Stage R&D Costs for a particular CK
Product under this Section 4.5. If the Parties are unable to resolve such
dispute, the matter shall be referred to the [*], and [*], for resolution. If
such individuals are unable to resolve such dispute within thirty (30) days
after the matter is referred to them, the matter shall be subject to arbitration
under Section 12.3.1 below. In such event, GSK may withhold [*] percent ([*]%)
of the disputed amount (i.e., [*]% times [*]% of the disputed Early Stage R&D
Costs), and failure by GSK to pay such portion of the disputed amount under this
Section 4.5 shall not be deemed a breach of this Agreement unless and until it
has been determined in an arbitration proceeding under Section 12.3.1 below that
GSK is obligated to pay such disputed amount, and GSK fails to make such payment
within thirty (30) days after such determination.

                        (ii)In no event, however, shall the total [*] costs
included within Early Stage R&D Costs exceed (a) [*] percent ([*]%) with respect
to research and preclinical development costs, or (b) [*] percent ([*]%) with
respect to clinical development costs, in each case that are described in (1)
through (7) of Section 4.5.2 (a)(i) above.

                        (iii) Notwithstanding the foregoing, Early Stage R&D
Costs shall not include costs for which GSK previously has reimbursed CK under
Section 6.2 or pursuant to this Section 4.5.2(a) (i.e., to the extent such costs
were included within the Early Stage R&D Costs for a Licensed Product for which
GSK previously exercised the CK Product Option).

                  (b) The base royalties payable to CK with respect to such
Licensed Product shall equal [*] percent ([*]%) of the royalty rates specified
in Section 6.6.2(a)(i) below (subject to paragraph (d) below). It is understood,
however, that for purposes of determining the applicable royalty rate, the total
annual Net Sales ranges shall be exactly the same as specified in Section
6.6.2(a)(i) below; so that for example, if the Net Sales of the Licensed Product
for the particular calendar year equal $[*], then the royalty payable for such
Licensed Product shall equal [*] percent ([*]%).

                  (c) For purposes of determining the milestone payments under
Section 6.4 below, such Licensed Product shall be deemed a Licensed Product [*]
for [*] (i.e., so that the milestone payments will equal the amounts specified
in Section 6.4.1). The milestone payments due with respect to such Licensed
Products under such Section 6.3.1 for Milestone 5 ([*]) and Section 6.4.1 for
Milestone 1 and Milestone 2 ([*], respectively) shall be due within forty-five
(45) days after GSK exercises the CK Product Option with respect to such
Licensed Product; provided, however, that a payment for a particular Milestone
shall not be so due if GSK has previously made a payment under Section 6.3.1
below for such Milestone with respect to a Development Compound directed to the
same Mitotic Kinesin Target or under Section 6.4.1 for such Milestone with
respect to

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the same Licensed Product (i.e., before such Mitotic Kinesin Target or Licensed
Product became a CK Target or CK Product, respectively); and provided, further,
that for purposes of this Section 4.5.2(c), the amount due with respect to
Milestone 5 under Section 6.3.1 shall be [*] US Dollars ($[*]) rather than [*]
US Dollars ($[*]). Notwithstanding the foregoing, GSK shall have no obligation
to make either such milestone payment to CK if GSK previously made a milestone
payment to CK with respect to such Product for such milestone under Section 6.3
or 6.4 below before the Licensed Product became a CK Product.

                  (d) CK's Co-Funding Option under Section 3.4 above shall apply
to such Licensed Product and CK shall exercise it, and the royalties payable
with respect to such Licensed Product shall equal the royalties described in
Section 4.5.2(b) above, plus X percentage points, where "X" equals the
difference in [*] between the [*] and the [*], [*], or [*], as the case may be,
in each case if such royalties had not been adjusted under Section 4.5.2(b)
above.

                  (e) From and after the time that GSK exercises the CK Product
Option with respect to a CK Product (which will then become a Licensed Product),
CK and GSK shall cooperate with respect to the further development activities of
such Licensed Product, pursuant to a Development Plan approved by the JDC.
Immediately following GSK's exercise of the CK Product Option, CK shall exercise
the Co-Funding Option with respect to the Licensed Product, and within [*] ([*])
days shall notify GSK of the CK Percentage, as set forth in Section 3.4.
Promptly following GSK's exercise of the CK Product Option and CK's notification
of the CK Percentage, the JDC shall establish such a Development Plan for the
Licensed Product. The Development Plan for the Licensed Product shall reflect
CK's exercise of its Co-Funding Option. In reviewing and approving the
Development Plan, the JDC shall take into consideration which Party is more
appropriate to conduct activities reflected in the Development Plan, taking into
consideration, among other factors, the scope and scale to which CK had been
conducting certain activities prior to GSK's exercise of the CK Product Option.
GSK and CK shall each assume those development activities agreed by the JDC.

                  (f) CK shall continue performing further activities related to
the development of such Licensed Product in accordance with CK's own development
plans for a period of one (1) year after GSK's exercise of the CK Product
Option, or until such earlier time as the JDC establishes such a Development
Plan, and thereafter the further development of the Licensed Product shall be
conducted in accordance with such Development Plan, as modified by the JDC from
time to time; provided, that during such interim period CK shall not initiate a
[*] trial, or make any major commitments with respect to a [*] trial of such
Licensed Product, including [*], except as approved by the JDC. Any activities
that are to be transferred by CK to GSK under the Development Plan shall be
transferred as quickly as possible, and CK shall take [*] to ensure such speedy
transfer. All costs incurred by CK in performing such activities (i.e., those
after GSK's exercise of the CK Product Option but prior to the JDC's
establishment of a Development Plan), and those conducted pursuant to the
Development Plan so established, shall be reimbursed by GSK to the extent they
exceed the CK Percentage elected by CK under the Co-Funding Option with respect
to the Licensed Product. All such reimbursements shall be made in the same
manner as is provided in Section 6.2 below for funding under the Research Plan
(including the provisions for interim periods, as contemplated in Section
6.2.4). CK and GSK shall establish specific reasonable invoicing and

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payment procedures for reimbursements under this Section 4.5.2(f), including the
form of invoice, overall documentation requirements and accounting
methodologies.

                  (g) Transition. Subject to paragraph (e) above, and incident
to the extent reasonably necessary for GSK to perform activities assigned to it
under the Development Plan approved by the JDC:

                        (i) From and after the time that GSK exercises the CK
Product Option with respect to a CK Product (which will then become a Licensed
Product), CK shall cooperate fully with GSK to provide GSK with all Licensed
Technology and Information to which GSK has a right or license under this
Agreement and which is necessary or useful for GSK to perform such activities.
Such cooperation shall include the [*] disclosure of all Information, to the
extent such information is not within the possession or control of GSK,
(including, without limitation, [*], all to the extent that such material is not
in the possession of GSK, and such other [*] and [*] as are reasonably necessary
or useful for GSK to exercise its full rights and perform such activities with
respect to such CK Product. Notwithstanding the foregoing, CK shall not be
considered to be in breach of this Section 4.5.2(g) for failure to disclose
information, if, despite [*] efforts, the identification of such information is
impractical or such information is not material. Without limiting the foregoing,
CK shall use [*] efforts to ensure orderly transition and uninterrupted research
and development of CK Products under this Section. GSK shall promptly reimburse
CK's [*] costs with respect to activities and materials provided by CK under
this Section 4.5.2(g).

                        (ii)In addition, the JDC shall meet and discuss how best
to proceed with the [*] of such CK Product in the best interest of such CK
Product and its commercial profile, taking into consideration the relative
capabilities of each Party, including CK's [*] or arrangements prior to GSK's
exercise of its CK Product Option. In the event that the JDC determines that [*]
such CK Product, CK shall cooperate fully to [*] related to the CK Product as
reflected in the Development Plan approved by the JDC.

                  (h) For purposes of this Section 4.5.2, all dosage forms, and
all formulations, of the same active ingredient shall be deemed a single
Licensed Product. Licensed Products having a different or additional active
ingredient shall be deemed a separate Licensed Product if such different or
additional active ingredient is a different or additional CK Compound or CK
Product or another active ingredient in which CK has proprietary rights (other
than a Licensed Product otherwise licensed to GSK hereunder).

            4.5.3 Termination. In the event that GSK does not elect to exercise
its CK Product Option on a CK Product, in accordance with Section 4.5.1 above,
then the CK Product Option, and all of CK's obligations under this Section 4.5
with respect to such CK Product, as well as with respect to all CK Compounds and
CK Products for the same CK Target shall terminate. CK shall thereafter be free
to develop such CK Products, CK Compounds and CK Targets, alone or in connection
with Third Parties.

            4.5.4 Abandoned Products. It is understood that this Section 4.5 and
the rights and obligations of GSK and CK under this Section 4.5 shall not apply
to any Abandoned Products. For

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such purposes, "Abandoned Products" shall mean those CK Compounds and CK
Products that are directed to Mitotic Kinesin Targets designated as CK Targets
under any Section of this Agreement other than (i) under Section [*] or (ii) by
reason of [*] failure to [*] a Development Compound for such Target within
the time period specified in Section [*] above.

            4.5.5 No Implied Obligations. The only obligations of GSK and CK
under this Section 4.5 are as expressly stated herein, and there are no further
implied obligations relating to the matters contemplated therein. Without
limiting the foregoing, it is further understood and agreed that the subject CK
Product(s) may or may not be discovered or reduced to practice at all, or that
further modification and/or variations of a product may be developed after the
date CK provides notice under Section 4.5.1 above. It is understood that
modifications and/or variations of a Licensed Product as described in Section
4.5.2(h) that are developed after the date CK provides notice under Section
4.5.1 above shall be included within the Licensed Product for which GSK
exercised its CK Product Option.

      4.6 CK Efforts. For as long as GSK retains an option on CK Products as set
forth in Section 4.5 above, CK shall use [*] efforts to develop at least one CK
Compound or CK Product, consistent with the practice of CK in pursuing the
development of pharmaceutical products of its own development and of similar
commercial potential value within the relevant product line.

      4.7 Royalties to GSK.

            4.7.1 Royalty Obligation. In the event that CK commercializes a CK
Product independently of GSK (i.e., in the case where GSK does not exercise the
CK Product Option), then in such case CK shall pay to GSK a royalty on sales of
such CK Product by CK, its Affiliates and Sublicensees, in an amount to be
reasonably established by the Parties, based on the extent to which GSK has [*]
under this Agreement, and/or has provided [*] to [*], that [*] the research,
development or commercialization of such CK Product. In the event the Parties
are not able to agree upon such royalty, then upon request by either Party, such
amount shall be determined in accordance with Section 12.3.1 below. It is
understood that, in connection with establishing the applicable royalty, the
ancillary terms of such royalty, such as the term for which such royalties are
due, the definition of CK's net sales, royalty reporting, audit rights, [*]
(such as those in Section [*] below) and the like will also be established,
which terms will be no less favorable to CK than the corresponding terms of this
Agreement. Notwithstanding the foregoing, in no event shall the royalty to be
paid to GSK exceed the following amounts, based on the stage of the CK Product
at the time the relevant Mitotic Kinesin Target became a CK Target (the
"Reversion Stage"), as reflected in the table below:

<TABLE>
<CAPTION>
REVERSION STAGE                                 [*] ROYALTY
---------------                                 -----------
<S>                                             <C>
[*]                                             [*]%
[*]                                             [*]%
[*]                                             [*]%
[*]                                             [*]%
[*]                                             [*]%
</TABLE>

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                                      -38-
<PAGE>

            4.7.2 [*]; [*]. For purposes of the foregoing table, the Reversion
Stage for all [*] and [*] shall be deemed the [*] stage.

            4.7.3 Other Considerations. It is understood that the royalty rates
specified in 4.7.1 above are [*]. The actual royalty rate to be applied in any
given situation shall be [*] and [*] under the circumstances and shall take into
account [*] to Mitotic Kinesin Targets prior to or outside of this Agreement,
the actual contribution of [*] to the effort in terms of [*], the possible need
for [*] (and in such case the possibility that [*]), and other similar factors.

      4.8 Other Formulations; Dosage Forms. For purposes of this Article 4, all
dosage forms, and all formulations, of the same active ingredient shall be
deemed a single CK Product. CK Products having a different active ingredient
shall be deemed a separate CK Product.

                           ARTICLE V - LICENSE GRANTS

      5.1 Research Licenses to CK and GSK. GSK hereby grants CK a non-exclusive,
worldwide license to make and use subject matter within the GSK Existing
Technology and Collaboration Technology, to conduct activities assigned to CK
under the Research Plan, during the Research Term. CK hereby grants GSK a
non-exclusive, worldwide license to make and use subject matter within the CK
Existing Technology and Collaboration Technology, to conduct activities assigned
to GSK under the Research Plan, during the Exclusivity Period and Extension
Period, if any. The licenses granted under this Section 5.1 shall not include
the right to grant or authorize sublicenses; provided, however, that the use by
GSK or CK of subcontractors approved by the JRC shall not be construed as a
sublicense.

      5.2 Commercial Licenses to GSK.

            5.2.1 Compounds, Development Compounds and Licensed Products.
Subject to the terms and conditions of this Agreement, CK hereby grants GSK an
exclusive license, under CK Existing Technology and CK's interest in
Collaboration Technology and Post-Collaboration Technology, (a) to make, have
made, use, sell, offer for sale and import Compounds, Development Compounds and
Licensed Products for use in the Field and in the Territory and (b) to make and
use Collaboration Targets, and any subject matter within the Collaboration
Technology or Post-Collaboration Technology, for the purpose of discovering and
commercializing Compounds, Development Compounds and Licensed Products for use
within the Field.

            5.2.2 CK Library Compounds.

                  (a) Notwithstanding Sections 1.4, 1.7, 1.13, 1.16 and 1.53, a
CK Library Compound shall not be deemed within CK Existing Technology, unless
and until such time as such CK Library Compound has become both a Compound and a
Development Compound hereunder. However, GSK is hereby granted a non-exclusive
license to make and use CK Library Compounds and CK Existing Technology to
pursue discovery (including optimization) and initial development of such CK
Library Compounds and derivatives thereof, for the purpose of identifying and
conducting initial development of Development Compounds for Collaboration
Targets and, during the Research Term and applicable extensions, for Mitotic
Kinesin Targets (other than CK Targets).

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<PAGE>

The CK Library Compounds that GSK is licensed to make and use under this Section
5.2.2 shall be limited to those (i) that were identified as Compounds against a
Mitotic Kinesin Target in activities under the Research Plan; and (ii) that are
derived from (i.e., tracing its chemical lineage to a CK Library Compound or
resulting from the direct progression through a continuing medicinal chemistry
program from a CK Library Compound, in each case as evidenced by contemporaneous
written laboratory records) the CK Library Compounds described in the preceding
clause (i). GSK shall have no research license under this Section 5.2.2 with
respect to CK Library Compounds that are not described in (i) or (ii) above.

                  (b) Notwithstanding Section 5.2.2(a) above, if CK has
progressed a CK Library Compound licensed to GSK under this Section 5.2.2 to a
stage equivalent to a Development Compound, where the primary mode of
pharmacological action of such CK Library Compound is not through inhibition of
one or more Mitotic Kinesin Targets, prior to GSK progressing such CK Library
Compound to be a Development Compound, GSK's licenses to such CK Library
Compound shall terminate. A compound shall be deemed to have reached a "stage
equivalent to a Development Compound" if such compound would meet criteria
comparable those specified in Exhibit 2.5, or IND Enabling Studies have been
conducted for such compound. Upon request, CK shall use good faith efforts to
advise GSK whether it is actively pursuing such CK Library Compound, and CK
shall notify GSK at such time as such CK Library Compound has progressed to a
stage equivalent to a Development Compound as described in this Section
5.2.2(b).

                  (c) Notwithstanding Section 5.2.2(a) above, GSK agrees not to
engage in optimization activities to discover Compounds that are derived from a
CK Library Compound in a manner that intentionally optimizes such Compounds
specifically to exploit the activity of such Compound against any target, other
than a Mitotic Kinesin Target that is not a CK Target.

            5.2.3 Sublicenses. GSK may sublicense the right to [*] and/or [*] a
particular Development Compound or Licensed Product [*] or [*]. GSK shall inform
CK of its intention to sublicense its rights at least sixty (60) days prior to
the date GSK intends to execute such sublicense and shall provide CK with the
opportunity to provide comments to GSK with respect to such sublicense. GSK
shall consider CK's reasonable comments in its decision whether to grant such
sublicense. Notwithstanding the foregoing, (i) GSK shall have the right to
sublicense the right to [*] and/or [*] a Licensed Product [*] or [*], provided
that GSK is actively [*] and [*] such Licensed Product itself [*], and (ii) GSK
shall have the right to have Licensed Products [*] for GSK by a Third Party [*]
and [*]. Subject to the foregoing, GSK shall have the sole right to decide
whether and how to grant any sublicenses under this Section 5.2.3. Any
sublicensee of GSK must have reasonable capabilities to support the [*] of the
Development Compound and/or Licensed Product. Any such sublicense (and any right
to obtain such a sublicense) shall be granted no earlier than the date the
Compound incorporated therein has been designated as a Development Compound in
accordance with Section 2.5 above.

            5.2.4 [*]. At least [*] ([*]) months prior to GSK [*], GSK will
notify CK in writing of its intent to [*] ("Initial Notice"). Upon request by
CK, GSK and CK will, during such [*] ([*]) month period, negotiate in good faith
the [*] to CK, provided that [*] by GSK for the Compound, Development Compound
or Licensed Product and the objective requirements set forth therein. It is
understood that any such [*] would be subject to agreement between the Parties
on the financial

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                                      -40-
<PAGE>

terms and other conditions of such [*]. Notwithstanding the foregoing, this
Section 5.2.4 shall not apply with respect to [*] the Development Compound or
Licensed Product.

            5.2.5 No Other Active Ingredients. For clarity, it is understood
that, notwithstanding Section 1.44 above, the licenses to GSK under this Section
5.2 shall not extend to any active ingredient included within a Licensed Product
other than a Compound, a Development Compound, or in the case of a Licensed
Product for which GSK exercised its CK Product Option pursuant to Section 4.5
above, the active ingredients incorporated by CK into the CK Product that became
such Licensed Product.

      5.3 Commercialization License to CK.

            5.3.1 CK Compounds and CK Products. Subject to GSK's Option for a
license under Section 4.5 above, GSK hereby grants CK an exclusive license, with
the right to grant and authorize sublicenses, under GSK Existing Technology
(subject to Section 5.3.2 below), and GSK's interest in Collaboration Technology
and Post-Collaboration Technology, (a) to make, have made, use, sell, offer for
sale and import CK Compounds and CK Products in the Field in the Territory and
(b) to make and use CK Targets, and any subject matter within the Collaboration
Technology or Post-Collaboration Technology, solely for the purpose of
discovering, developing and commercializing CK Compounds and CK Products.

            5.3.2 GSK Library Compounds; Additional Research License.

                  (a) Notwithstanding Sections 1.13, 1.16, 1.34 and 1.53, a GSK
Library Compound shall not be deemed within the GSK Existing Technology, unless
and until such time as IND Enabling Studies are commenced by or under authority
of CK with respect to such GSK Library Compound. However, CK is hereby granted a
non-exclusive license to make and use GSK Library Compounds and GSK Existing
Technology to pursue discovery (including optimization) and initial development
of such GSK Library Compounds and derivatives thereof, for the purpose of
identifying and conducting initial development of CK Compounds that meet
criteria similar to that of Development Compounds; provided that the GSK Library
Compounds that CK is so licensed to make and use under this Section 5.3.2 shall
be limited to those (i) that were identified as Compounds against such Mitotic
Kinesin Target before such Mitotic Kinesin Target was designated as a CK Target,
or (ii) that are derived from (i.e., tracing its chemical lineage to a GSK
Library Compound or resulting from the direct progression through a continuing
medicinal chemistry program from a GSK Library Compound, in each case as
evidenced by contemporaneous written laboratory records) the GSK Library
Compounds described in the preceding clause (i). CK shall have no research
license under this Section 5.3.2 with respect to GSK Library Compounds that are
not described in (i) or (ii) above.

                  (b) Notwithstanding (a) above, if GSK has progressed a GSK
Library Compound licensed to CK under this Section 5.3.2. to a stage equivalent
to a Development Compound, where the primary mode of pharmacological action of
such GSK Library Compound is not through inhibition of one or more Mitotic
Kinesin Targets, prior to CK progressing such GSK Library Compound to a stage
equivalent to a Development Compound, CK's licenses to such GSK Library Compound
shall terminate. A compound shall be deemed to have reached a "stage

                                      -41-
<PAGE>

equivalent to a Development Compound" if such compound would meet criteria
comparable those specified in Exhibit 2.5, or IND Enabling Studies have been
conducted for such compound. Upon request, GSK shall use good faith efforts to
advise CK whether it is actively pursuing such GSK Library Compound and GSK
shall notify CK at such time as a GSK Library Compound has progressed to a stage
equivalent to a Development Compound as described in this Section 5.3.2(b).

                  (c) Notwithstanding Section 5.3.2(a) above, CK agrees not to
engage in optimization activities to discover CK Compounds that are derived from
a GSK Library Compound in a manner that intentionally optimizes such CK
Compounds specifically to exploit the activity of such CK Compound against any
target, other than a CK Target.

            5.3.3 No Other Active Ingredients. For clarity, it is understood
that, notwithstanding Section 1.9 above, the licenses to CK under this Section
5.3 shall not extend to any active ingredient included within a CK Product other
than a CK Compound.

      5.4 Additional Licenses for Unpatented Collaboration and
Post-Collaboration Technology.

            5.4.1 License to GSK. CK hereby grants to GSK a non-exclusive
license, including the right to grant and authorize sublicenses, under CK's
interest in any Collaboration Technology and Post-Collaboration Technology,
other than CK Patents, to use and otherwise exploit the same for any purpose,
subject to Sections 4.1-4.3, and Section 5.3, above.

            5.4.2 License to CK. GSK hereby grants to CK a non-exclusive
license, including the right to grant and authorize sublicenses, under GSK's
interest in any Collaboration Technology and Post-Collaboration Technology,
other than GSK Patents, to use and otherwise exploit the same for any purpose,
subject to Sections 4.1-4.3, and Section 5.2, above.

      5.5 Cytometrix(TM) Technology. It is understood that CK has developed
certain Cytometrix(TM) Technology, which may be useful in the discovery of
Compounds, and that CK will apply such Cytometrix(TM) Technology to the Research
Program, as described more fully in the Research Plan. Notwithstanding any other
provision of this Agreement, however, the Parties agree that CK's Cytometrix(TM)
Technology is [*] or [*], and CK is [*] to [*] GSK with such Cytometrix(TM)
Technology; provided, however, that (i) [*], as applicable, and (ii) [*] within
the Cytometrix(TM) Technology would [*] be [*] by the [*] or [*] of a Compound,
Development Compound, or Licensed Product, such [*] shall be [*], [*] for such
purposes. [*] (i) [*]; (ii) [*]; and (iii) [*].

      5.6 [*]. If a chemical entity that would otherwise be a Compound or CK
Compound hereunder, meets the Compound Criteria for both a [*] and a [*], then
such chemical entity shall be considered a "[*]" if the difference in [*]
activity ([*]) is less than [*] between the [*] and the [*]. Furthermore, such a
chemical entity shall be deemed a Compound, and not a CK Compound, if its [*]
activity ([*]) is [*] greater against the [*] than against the [*]. Such a
chemical entity shall be deemed a CK Compound, and not a Compound, if its [*]
activity ([*]) is [*] greater against a [*] than against the [*]. With respect
to [*], either Party shall have the right to pursue research and optimization of
such [*] for the purpose of identifying Compounds or CK Compounds that meet the
criteria for Development Compounds (or, in the case of CK Compounds, criteria
similar thereto);

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provided, however, that neither Party shall commence clinical development or
commercialize a [*] as a Compound, Development Compound, Licensed Product, CK
Compound or CK Product without the prior written approval of the other Party.
Notwithstanding the foregoing, GSK shall not engage in optimization activities
to discover Compounds in a manner that intentionally optimizes such Compounds
specifically to exploit the activity of such Compound against a [*]; and, CK
shall not engage in optimization activities to discover CK Compounds in a manner
that intentionally optimizes such CK Compounds specifically to exploit the
activity of such CK Compound against a [*]. As used herein, [*] activity ([*])
shall mean the first criterion set forth in Exhibit 1.17.

      5.7 No Implied Licenses. Each Party acknowledges that the licenses granted
under this Article V are limited to the scope expressly granted, and all other
rights to Licensed Technology are expressly reserved to the Party owning such
Licensed Technology. Without limiting the foregoing, it is understood that where
an exclusive license under Licensed Technology is granted to a Party under this
Article V for a particular purpose, the Party granting such license retains all
of its rights to such Licensed Technology for all purposes not expressly
licensed. Accordingly, for example, the license granted under Section 5.2.1(b)
above shall not preclude CK from making or using a Collaboration Target for
purposes outside the Field.

      5.8 Nothing in this Article V shall be construed as limiting or changing
the rights and obligations of the Parties under Sections 4.1.1 and 4.1.2, except
to the extent provided in Section 5.5 above.

                              ARTICLE VI - PAYMENTS

      6.1 Initial Payments.

                  (a) Technology Access Fee. In consideration of CK's
development efforts prior to the Effective Date and the performance of its
obligations during the Research Program, on the Closing Date, GSK shall pay to
CK an initial fee of Fourteen Million U.S. Dollars (U.S. $14,000,000), which
amount shall be non-refundable and non-creditable against any other amounts due
CK under this Agreement.

                  (b) Equity Investment. It is understood that GSK has also
agreed to make an equity investment in CK, on the Closing Date, in the amount of
Fourteen Million U.S. Dollars (U.S. $14,000,000) pursuant to the terms and
conditions of a Stock Purchase Agreement of even date referencing this
Agreement.

      6.2 Research Payments - Funding. Subject to the limitations set forth
below, from and after the Effective Date, GSK shall reimburse costs incurred by
CK in performing the Research Program in accordance with the Research Plan, in
the following manner:

            6.2.1 FTEs. An FTE rate determined in accordance with this Section
6.2.1 shall be used for purposes of determining the costs incurred by CK with
respect to CK personnel performing work on the Research Program. The FTE rate
shall be [*] U.S. Dollars (U.S. $[*]) per FTE (as adjusted below). The FTE rate
includes all salary, employee benefits, incidental materials and other expenses
including support staff and overhead for or associated with an FTE and travel
and lodging

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expenses incurred by such FTEs in performance of the Research Program. Effective
beginning with the calendar year 2002, the FTE rate shall increase no more than
once annually by the percentage increase, if any, in (i) the Radford Associates
Annual Biotechnology Compensation and Benefits Survey for the San Francisco Bay
Area, or (ii) the Consumer Price Index, for All Urban Consumers for the San
Francisco Bay Area, as published by the U.S. Department of Labor, Bureau of
Labor Statistics, in each case whichever increase is higher since the last such
increase under this Section 6.2.1, (or in the case of the first such increase,
the Effective Date) (the "Cost of Labor Increase"), upon thirty (30) days prior
written notice to GSK and such increase shall be effective for the then-current
and all subsequent Research Plans hereunder until further modified under this
Section 6.2.1.

            6.2.2 Non-FTE Costs. If the JRC specifically requests, as confirmed
by GSK in writing or in the written Research Plan approved by the JRC, that CK
conduct and fund a research activity at an external center, CK's out-of-pocket
external costs incurred by CK in following such request shall be reimbursed at
CK's cost; provided that, if CK identifies that a particular task can be
efficiently performed by a Third Party, CK may satisfy its FTE commitment with
personnel from such Third Party if such Third Party is approved by the JRC, and
that, unless the JRC determines otherwise, such Third Party personnel will be
deemed a CK FTE for purposes of the Research Plan and this Agreement.

            6.2.3 Payment. On or before the first day of each calendar [*]
during the Research Term, after receipt of an invoice from CK, GSK shall pay to
CK an amount equal to the costs budgeted to be incurred by CK under the Research
Plan for such [*]. Unless otherwise specified in the applicable Research Plan,
amounts budgeted for the full year will be deemed budgeted in equal amounts for
each calendar [*] during such year. Within sixty (60) days following the end of
each calendar [*] during the Research Term, CK shall provide to GSK a summary of
the costs actually incurred during each calendar [*] in performing the Research
Plan during such period, in a form mutually agreed by the Parties. If the costs
so incurred by CK in such period are less than the amounts budgeted for CK to so
incur during such period under the Research Plan, then the difference will be
carried forward and credited against the next payment due to CK under this
Section 6.2. If CK incurs in such period costs in excess of the amounts so
budgeted, the excess may be carried forward and treated as costs incurred in a
subsequent period. Notwithstanding the foregoing, for the period from the
Effective Date through September 30, 2001, GSK shall pay to CK, within ten (10)
business days after the Effective Date, an amount equal to the costs budgeted to
be incurred by CK under the Research Plan for such period; provided, however,
that if GSK or CK terminates this Agreement pursuant to Section 11.1.1, CK shall
reimburse any payments made by GSK to CK under this Section.

            6.2.4 Interim Periods. In the event the JRC is unable for any reason
to establish a Research Plan for any period during the Research Term, then in
such case the [*] advance payments to CK for each [*] during any such interim
period shall equal [*] of the FTE rate multiplied by the actual number of CK
FTEs covered by the last Research Plan that was approved by the JRC, for the
last [*] covered by such approved Research Plan; provided that, if such number
exceeds the minimum number of CK FTEs required to be included in any Research
Plan for the particular Contract Year, as reflected in Section 2.6 above, then
GSK may elect to [*] the number of CK FTEs for such interim period to a number
[*] specified in Section 2.6, by so notifying CK in writing. If

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GSK so elects, the [*] advance payments to CK for each [*] during any such
interim period shall equal [*] of the FTE rate multiplied by the actual number
of CK FTEs listed in GSK's notice (which shall [*] number of CK's FTEs for such
period specified in Section 2.6 above). Any payments made under this Section
6.2.4 shall be non-refundable.

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      6.3 Research Milestone Payments.

            6.3.1 Milestones. GSK shall pay to CK the following amounts upon
achievement of each occurrence of the following events (each a "Research
Performance Milestone"):

<TABLE>
<CAPTION>
                                                                  CASH PAYMENT
                                                               (IN U.S. DOLLARS)
                                                               -----------------
<S>   <C>                                                      <C>
                                    MILESTONE

1.    [*]                                                             $[*]

2.    [*]                                                             $[*]

3.    [*]                                                             $[*]

4.    [*]                                                             $[*]

5.    [*]                                                             $[*]

6.    [*]                                                             $[*]
</TABLE>

            6.3.2 Certain Terms and Conditions.

                  (a) "[*]" shall have the meaning set forth in Exhibit [*],
attached hereto and incorporated herein.

                  (b) In the event that the first Compound against the [*]
Mitotic Kinesin Target induces [*], but [*], in its [*] discretion, elects to
approve the Compound as a [*], then Research Performance Milestone 5 shall be
[*] to [*] United States dollars (U.S. $[*]). "[*]" shall have the meaning set
forth in Exhibit 6.3.2(b), attached hereto and incorporated herein. If such [*]
does not exhibit evidence of [*] in [*] (as defined in Exhibit 6.4.4), then the
Development Milestone under Section 6.4 below (initiation of [*]) for a Licensed
Product incorporating such [*] shall be [*] by [*] U.S. Dollars (U.S. $[*]).

                  (c) It is understood that Research Performance Milestone 5 may
be satisfied by [*], if and when [*] by [*] as a [*] in accordance with Section
[*].

                  (d) Selection of [*] shall be in accordance with Section [*].
It is understood that Research Performance Milestone [*] shall be paid on a
Target-by-Target basis, so that the selection of the first [*] for each [*]
Mitotic Kinesin Target shall trigger a separate payment of [*] U.S. Dollars
(U.S. $[*]).

      6.4 Development Milestones. Except as set forth below, GSK shall pay to CK
upon achievement of the corresponding events set forth below (each, a
"Development Milestone") for each Licensed Product, regardless of whether the
development, promotion, or marketing of such Licensed Product is discontinued at
any time after the achievement of such milestone:

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            6.4.1 [*]. For each Licensed Product that [*]:

<TABLE>
<CAPTION>
               MILESTONE       [*]       [*]                  [*]
               ---------       ---       ---                  ---
<S>                           <C>       <C>                  <C>
1.   [*]                      $[*]       [*]                  [*]

2.   [*]                      $[*]       [*]                  [*]

3.   [*]                      $[*]       [*]                 $[*]

4.   [*]                      $[*]       [*]                 $[*]

5.   [*]                      $[*]       [*]                 $[*]

6.   [*]                      $[*]      $[*]                 $[*]

7.   [*]                      $[*]      $[*]                 $[*]
</TABLE>

* Certain information on this page has been omitted and filed separately with
  the Commission. Confidential treatment has been requested with respect to the
  omitted portions.

                                      -47-
<PAGE>

            6.4.2 [*]. For each Licensed Product that [*], on a Collaboration
Target-by-Target basis:

<TABLE>
<CAPTION>
MILESTONE       [*]       [*]       [*]
---------       ---       ---       ---
<S>            <C>       <C>       <C>
1.   [*]       $[*]       [*]       [*]

2.   [*]       $[*]       [*]       [*]

3.   [*]       $[*]       [*]      $[*]

4.   [*]       $[*]       [*]      $[*]

5.   [*]       $[*]       [*]      $[*]

6.   [*]       $[*]      $[*]      $[*]

7.   [*]       $[*]      $[*]      $[*]
</TABLE>

            6.4.3 Certain Terms. For purposes of the Development Milestones due
under this Section 6.4:

                  (a) In no event will multiple Development Milestone payments
be made for the same Licensed Product, except in the event where a Licensed
Product for [*] is also the [*] Licensed Product directed against that Mitotic
Kinesin Target to be [*] for a [*].

                  (b) It is understood that the Development Milestone payments
reflected under the column "[*]" shall be payable whether or not Development
Milestones have been paid for such Licensed Product with respect to [*]. In
addition, the "[*]" need not be the same Licensed Product as the "[*]."

                  (c) Notwithstanding the definition of [*] under Section [*], a
clinical trial that is a [*] shall not be deemed a [*] trial that meets such
Development Milestone [*], and accordingly, the payment corresponding to such
Development Milestone [*] shall not become due by reason of such a [*]. For
purposes of this Section 6.4.3, a "[*]" shall mean a [*], as provided in [*],
submitted for the sole purpose of conducting a [*] study or [*] study of the [*]
of no more than [*] ([*]) [*] to compare the [*] of at least [*] ([*]), but not
more than [*] ([*]), [*]. Any clinical trial that includes activities in
addition to those listed in this Section, including without limitation [*] or
any subsequent clinical trial of the particular Compound, shall not be deemed a
[*], and upon initiation of such trial, Development Milestone [*] shall be
immediately due and payable.

                  (d) For purposes of this Section 6.4, and Section 6.6 below,
all dosage forms, and all formulations, of the same active ingredient shall be
deemed a single Licensed Product. Licensed Products having a different or
additional active ingredient shall be deemed a separate Licensed Product;
provided, however, that the different or additional active ingredient is a
different or additional Development Compound than the original Development
Compound contained in the Licensed Product.

*  Certain information on this page has been omitted and filed separately with
   the Commission. Confidential treatment has been requested with respect to the
   omitted portions.

                                      -48-
<PAGE>

                  (e) The Development Milestone payments under Section 6.4.2
shall be determined on a Mitotic Kinesin Target-by-Target basis, meaning, for
example, that the [*] that is directed to a particular Mitotic Kinesin Target
shall trigger the payments under the column "[*]" milestone, and that the [*]
for another Mitotic Kinesin Target shall also trigger those payments.

                  (f) "[*]" of a particular clinical trial shall mean the date
of [*] of the [*] subject in such trial.

                  (g) If a subsequent Development Milestone is achieved with
respect to a particular Licensed Product before a prior Development Milestone
("prior" and "subsequent" referring to a lower number in the tables above, e.g.,
Development Milestone 2 being "prior" to Development Milestone 3), then all such
prior Development Milestones shall be deemed achieved upon achievement of the
subsequent Development Milestone.

                  (h) "[*]" of an [*] shall mean the date of receipt by GSK of
written notice of [*] from the FDA (or its equivalent in a country outside the
U.S.) of an [*] for the Licensed Product for [*].

                  (i) "[*] of an [*] by [*]" shall mean the date that an [*] has
been [*] for a Licensed Product in [*]; provided that, if such application is
[*] by the [*] ("[*]") under the [*] the Development Milestone will be met (in
full). For purposes of the foregoing, validation of an [*] by [*] or the [*]
shall be deemed "[*]" of such [*] by such [*] or [*], as applicable, and if an
[*] is submitted under the [*] and validated by the [*] ("[*]"), such [*] shall
be deemed [*] by a [*] upon confirmation that the resulting [*] in the [*] will
serve as the basis for [*] in such [*].

                  (j) "Receipt of [*] from [*]" shall mean the [*] for the
Licensed Product, in [*]; provided, however, that GSK shall pay CK [*] ([*]) of
Development Milestone [*] under Sections 6.4.1 and 6.4.2, as applicable, upon
the date that GSK receives [*] from [*]. GSK shall subsequently pay CK an
additional [*] ([*]) of Development Milestone [*] when GSK receives [*] from
each of [*].

            6.4.4 Credits.

                  (a) Should all development of a particular Licensed Product
for a particular Collaboration Target discontinue prior to [*] in [*], for any
reason, and be replaced by an alternative Licensed Product against that
Collaboration Target, then, for the next Licensed Product for such Collaboration
Target to achieve a milestone for which a corresponding milestone payment was
made for the discontinued Licensed Product, no payment shall be due with respect
to such alternative Licensed Product with respect to such milestone.

                  (b) If there is evidence of [*] in [*] for a particular
Licensed Product, but GSK, in its sole discretion, elects to continue
development of such Licensed Product, then (i) Development Milestone [*] shall
be [*] by [*] percent ([*]%), and (ii) Development Milestones [*] through [*]
shall each be [*] by [*] percent ([*]%). "[*]" shall have the meaning set forth
in Exhibit 6.4.4, attached hereto and incorporated herein. Notwithstanding the
foregoing, in the event that such Licensed Product receives [*] in the [*] or a
[*], and the [*] required by such [*] does not

*  Certain information on this page has been omitted and filed separately with
   the Commission. Confidential treatment has been requested with respect to the
   omitted portions.

                                      -49-
<PAGE>

[*], then the amount of all such milestone [*] for such Licensed Product shall
be paid to CK upon receipt of such [*].

      6.5 Milestone Payment Timing. The payments set forth in Sections 6.3 and
6.4 hereof shall each be due and payable by GSK to CK within forty-five (45)
days of the occurrence of the milestone event set forth therein. For milestones
accomplished by CK, such payment shall be due forty-five (45) days after receipt
by GSK of an invoice from CK therefor to GSK, subject to GSK's verification
during such forty-five (45) day period that the milestone occurred. GSK and CK
agree to promptly notify the other of its achievement of any milestone.

      6.6 Earned Royalties For Licensed Products. GSK shall pay CK a royalty on
worldwide Net Sales of Licensed Products by GSK, its Affiliates or Sublicensees.
Such royalty shall be paid based on the total annual worldwide Net Sales for
each calendar year, on a Licensed Product-by-Licensed Product basis.

*  Certain information on this page has been omitted and filed separately with
   the Commission. Confidential treatment has been requested with respect to the
   omitted portions.

                                      -50-

<PAGE>

      6.6.1 General. Subject to Section 6.6.2 below, the annual royalty rate for
a particular Licensed Product in a given year shall be determined by the total
worldwide annual Net Sales of such Licensed Product for the particular calendar
year, according to the following schedules.

                  (a) For each Licensed Product that [*]:

<TABLE>
<CAPTION>
       Total Annual Net Sales                       Royalty
<S>                                                 <C>
           Less than $[*]                             [*]%
        Between $[*] and $[*]                         [*]%
          Greater than $[*]                           [*]%
</TABLE>

                  (b) For each Licensed Product that [*]:

<TABLE>
<CAPTION>
       Total Annual Net Sales                       Royalty
<S>                                                 <C>
           Less than $[*]                             [*]%
        Between $[*] and $[*]                         [*]%
          Greater than $[*]                           [*]%
</TABLE>

      6.6.2 Licensed Products Subject to Co-Funding Option. With respect to
Licensed Products for which CK has exercised its Co-Funding Option pursuant to
Section 3.4, the annual royalty rate for a particular Licensed Product in a
given calendar year shall be determined by the total annual worldwide Net Sales
of such Licensed Product in that calendar year and the percentage of Later Stage
Development Costs for such Licensed Product that CK elected to fund, according
to the following schedules.

            (a) If CK elected to fund the Later Stage Development Costs with
respect to a Co-Funded Product at a CK Percentage of [*] percent ([*]%),

                       (i) For each Licensed Product [*]:
<TABLE>
<CAPTION>
       Total Annual Net Sales                       Royalty
<S>                                                 <C>
           Less than $[*]                             [*]%
        Between $[*] and $[*]                         [*]%
          Greater than $[*]                           [*]%
</TABLE>

*  Certain information on this page has been omitted and filed separately with
   the Commission. Confidential treatment has been requested with respect to the
   omitted portions.

                                     - 51 -
<PAGE>
                    (ii)For each Licensed Product that [*]:

<TABLE>
<CAPTION>
       Total Annual Net Sales                       Royalty
<S>                                                 <C>
           Less than $[*]                             [*]%
        Between $[*] and $[*]                         [*]%
          Greater than $[*]                           [*]%
</TABLE>

            (b) If CK elected to fund the Later Stage Development Costs with
respect to a Co-Funded Product at a CK Percentage of [*] percent ([*]%),

                     (i) For each Licensed Product that [*]:

<TABLE>
<CAPTION>
       Total Annual Net Sales                       Royalty
<S>                                                 <C>
           Less than $[*]                             [*]%
        Between $[*] and $[*]                         [*]%
          Greater than $[*]                           [*]%
</TABLE>

                     (ii)For each Licensed Product that [*]:

<TABLE>
<CAPTION>
       Total Annual Net Sales                       Royalty
<S>                                                 <C>
           Less than $[*]                             [*]%
        Between $[*] and $[*]                         [*]%
          Greater than $[*]                           [*]%
</TABLE>

      (c) For any particular Co-Funded Product for which CK terminates its
obligation to fund Later Stage Development Costs under Section 3.4.2(e), GSK
shall pay the royalty rate under this Section 6.6.2 corresponding to the CK
Percentage elected by CK for such Co-Funded Product; provided that GSK's
obligation to pay the royalty rate set forth in this Section 6.6.2 for Net Sales
of such Co-Funded Product shall continue only until such time as the difference
between the cumulative royalties paid under this Section 6.6.2 for such
Co-Funded Product, and the cumulative royalties for Net Sales of such Co-Funded
Product that would have otherwise been payable under Section 6.6 if CK had not
exercised its Co-Funding Option, equals the amount paid by CK to GSK for Later
Stage Development Costs, plus interest at a rate of [*] percent ([*]%) per
annum, for such Co-Funded Product prior to the effective date of the
termination. Thereafter, GSK shall pay royalties on Net Sales of such Co-Funded
Product according to Section 6.6.1.

*  Certain information on this page has been omitted and filed separately with
   the Commission. Confidential treatment has been requested with respect to the
   omitted portions.

                                     - 52 -
<PAGE>
      6.6.3 Other.

            (a) For purposes of determining the royalty rates applicable
hereunder, it is understood that "total annual Net Sales" shall be determined on
a world-wide, calendar year basis, and shall be determined separately for each
separate Licensed Product.

            (b) Further, it is understood that if the total annual Net Sales for
a particular calendar year are within a particular Net Sales range, as reflected
in the tables in paragraphs (a) or (b) of either 6.6.1 or 6.6.2 above, then the
royalty corresponding to such range shall apply to all total Net Sales for the
particular calendar year (i.e., not just to those Net Sales within the range).
For example, for a Licensed Product [*] covered by Section 6.6.1(a) above, if
the total Net Sales in a particular calendar year are $[*], then the royalty for
all Net Sales of such Licensed Product for such calendar year shall equal [*]
percent ([*]%). Eighteen (18) months after the date of the initial commercial
sale of a Licensed Product in the Territory, GSK and CK shall agree upon a
reasonable mechanism to smooth out the quarterly payment of royalties based on
the expected levels of Net Sales of Licensed Products for the particular
calendar year, and the corresponding royalty expected to be due for such
calendar year, so that the royalties paid for each quarter shall equal as
approximately as practical the actual royalty that will be payable for the
calendar year in which such quarter occurs, based on the application of this
Section 6.6.

            (c) GSK agrees to establish list prices and discounts for each
Licensed Product in the best interests of such Licensed Product, taking into
account the competitive environment, product profile and commercial potential of
the Licensed Product. Without limiting the foregoing, GSK agrees that it shall
establish list prices and discounts for each Licensed Product in a manner to
maximize the commercial success of the Licensed Product in a particular country.
Such pricing and discounting decisions shall take into consideration their
impact on CK.

      6.7 Term For Royalty Payment. Royalties payable under Section 6.6 shall be
paid on a country-by-country basis from the date of the first commercial sale of
each Licensed Product with respect to which royalty payments are due for a
period which is the longer of:

                  (i) the expiration of the last to expire Patent in such
country covering the composition of matter or use of a Compound or Licensed
Product; or

                  (ii)[*] ([*]) years following the date of the first commercial
sale of such Licensed Product in such country.

      6.8 Payment; Foreign Exchange. All payments under this Agreement shall be
made from the United States by a United States entity or from the United Kingdom
by a U.K. entity. The remittance of royalties payable on Net Sales will be
payable in U.S. dollars to a bank and to an account designated by CK using a
rate of exchange of the currency in which the Net Sales occurred with U.S.
dollars, as published in the Wall Street Journal on the last day of the quarter
for which such payment was due.

      6.9 Taxes. Subject to Section 12.5, in the event that GSK is required to
withhold and remit any tax to the revenue authorities in any country in the
Territory regarding any milestone

*  Certain information on this page has been omitted and filed separately with
   the Commission. Confidential treatment has been requested with respect to the
   omitted portions.

                                     - 53 -
<PAGE>
payment or royalties payable to CK due to the laws of such country, such amount
shall be withheld by GSK, and GSK shall notify CK and promptly furnish CK with
copies of any documentation evidencing such withholding.

      6.10 Timing of Royalty Payments and Reports. Royalty payments under this
Agreement shall be made to CK or its designee quarterly within sixty (60) days
following the end of each calendar quarter for which royalties are due. Each
royalty payment shall be accompanied by a report summarizing the Net Sales
during the relevant three (3) month period.

      6.11 Accounting. The Parties shall maintain complete and accurate records,
in accordance with generally accepted accounting practices, which are relevant
to costs, expenses and payments under this Agreement. Such records shall be open
during reasonable business hours for examination at the other Party's expense,
upon written notice to the other Party, and not more often than once each year
by a certified public accountant or other representative selected by the Party
for the sole purpose of verifying the correctness of calculations or such costs,
expenses or payments made under this Agreement. In the event that such
examination establishes a discrepancy for any period covered by such examination
in excess of [*] percent ([*]%), the Party owing any payment shall reimburse the
other Party for such unpaid amount in addition to the expense of the
examination. Any records or accounting information received from the other Party
shall be Confidential Information for purposes of Article IX.

      6.12 [*].

      6.12.1 Right of [*]. In the event that (i) it becomes necessary for [*] to
[*] under [*] of a Third Party, where such [*] or [*] of a Development Compound
comprising a Licensed Product, or the [*] or [*] (as defined below) of the
Collaboration Target to which such Licensed Product is directed, which
Development Compound or Collaboration Target is within the CK Existing
Technology or consists of Collaboration or Post-Collaboration Technology owned
solely or jointly by CK, and such [*] would [*] or [*] of such Licensed Product
(but not, for example, by reason of its [*] or [*]), and (ii) [*] must [*] such
Third Party for such [*] on [*] such Licensed Product [*], [*] may [*] that [*]
of the [*] to such Third Party as the Parties agree under [*] below, but in no
event more than [*] percent ([*]%) of such [*], against [*] on [*] of such
Licensed Product [*], subject in each case to the [*] of [*] specified in [*]
below. [*] shall not be entitled to such [*] in [*] of the [*] in the event the
[*] of such Third Party for which such [*] have been incurred are [*] or [*].
For purposes of this Section 6.12.1, a [*] shall "[*] of the Collaboration
Target" if such [*] a [*] or [*] by [*] of such Collaboration Target.

      6.12.2 Consultation; Disputes. [*] shall consult with [*] prior to
entering into any [*] with a Third Party for which [*] would seek to [*] under
this Section 6.12, and shall take into account reasonable suggestions of [*]
with respect to such proposed [*]. Any dispute under this Section 6.12,
including any dispute as to whether such a [*] is necessary, shall be resolved
in accordance with Section 12.3.1 below.

      6.12.3 [*]. In addition to the [*], it is understood that on a
case-by-case basis, GSK and CK may agree that it would be in their mutual best
interests to [*] a [*] for [*] with a Licensed Product, and in such case may
similarly agree that it would be in their mutual best interests to [*]

*  Certain information on this page has been omitted and filed separately with
   the Commission. Confidential treatment has been requested with respect to the
   omitted portions.

                                     - 54 -
<PAGE>
with respect to such [*]; provided, however, that neither Party shall be
obligated to agree to any such [*] or [*], and no such [*] shall be made unless
so agreed.

      6.13 [*] in [*] for [*]. If, during the Exclusivity Period or Extension
Period, as applicable, [*] occurs in [*] or [*] of the [*] between a Licensed
Product being marketed and sold under this Agreement by GSK, its Affiliates or
Sublicensees and any [*] (as defined below) [*] and [*] (other than a GSK
Affiliate or Sublicensee), and for so long as such [*] is [*] and [*] in such
[*] or [*] of [*], and [*] of such [*] percent ([*]%) of the total [*] of such
[*] and the Licensed Product in the [*] in such Contract Year, the [*] in
respect of such [*] or [*] shall be [*] to the extent provided in Section [*]
below. GSK shall give CK [*] of such [*] with suitable and reasonable supporting
documentation. Any [*] in the [*] as a result of such [*] shall apply from the
[*] by GSK to CK of such [*] and shall be [*] only for the period such [*],
subject in each case to Section [*] below. For the purposes of this Section
6.13, a "[*]" shall mean any [*] (other than a Licensed Product sold by or under
authority of GSK) containing the [*] as the [*] in the Licensed Product being
sold by GSK, or its Affiliate or Sublicensee in [*], and which [*] the Licensed
Product in the [*] or [*].

      6.14 Conditions to [*]; Amount of [*].

            6.14.1 Conditions to [*]. It is understood that, if [*] of a
Licensed Product [*] are [*] by the [*] or by [*], [*] will be [*] by [*] due to
[*]. Consequently, the Parties acknowledge that Sections 6.12 and 6.13 are
intended only to avoid a [*] on [*] in the event described herein. Accordingly,
notwithstanding Section 6.12 or 6.13 above, the [*] with respect to [*] of a
Licensed Product [*] shall only be [*] if [*] and [*] of such Licensed Product
in [*] have been [*] by reason of either [*] or [*], and the [*] would create
[*] between GSK and CK with respect to the [*] of such Licensed Product in [*]
without a [*] under Section 6.12 or 6.13, as applicable. In addition, (i) before
any [*] under Section 6.12 or 6.13 shall take effect, GSK shall consult with CK
as to measures that can reasonably be taken to [*] of such [*] or [*], and (ii)
[*] under Section 6.12 or 6.13 shall continue only if GSK reasonably initiates
and continues to progress such [*]; and (iii) any [*] under Section 6.12 or 6.13
shall continue only if GSK continues to pursue all reasonably available legal
measures that could [*] or [*] for [*] or [*] or [*], as applicable, including
the [*] of any [*] that could [*] or [*] of a [*], directly or indirectly, and
the [*] of any applicable [*] or [*] that could affect the [*].

            6.14.2 Amount of [*]. The amount of the [*] under Sections 6.12 and
6.13 shall be reasonably agreed by GSK and CK, taking into account the factors
described in this Section 6.14 above, provided that the [*] otherwise [*] on
such [*] shall not be so [*], after [*] or [*] under this Agreement, if any, to
[*] specified in the tables below:

                  (a) For Licensed Products [*]:

*  Certain information on this page has been omitted and filed separately with
   the Commission. Confidential treatment has been requested with respect to the
   omitted portions.

                                     - 55 -
<PAGE>
<TABLE>
<CAPTION>
                             NO CO-FUNDING            [*]% CO-FUNDING               [*]% CO-FUNDING
<S>                         <C>                       <C>                           <C>
TOTAL ANNUAL NET SALES

< $[*]                            [*]%                     [*]%                          [*]%

$[*] - $[*]                       [*]%                     [*]%                          [*]%

> $[*]                            [*]%                     [*]%                          [*]%
</TABLE>

                       (b) For Licensed Products that [*]:

<TABLE>
<CAPTION>
                             NO CO-FUNDING            [*]% CO-FUNDING               [*]% CO-FUNDING

TOTAL ANNUAL NET SALES
<S>                         <C>                       <C>                           <C>
<  $[*]                           [*]%                     [*]%                          [*]%

$[*] - $[*]                       [*]%                     [*]%                          [*]%

> $[*]                            [*]%                     [*]%                          [*]%
</TABLE>

      Accordingly, under the foregoing table, (i) if Net Sales of a particular
Licensed Product are less than [*] U.S. Dollars (U.S. $[*]), the royalty payable
shall be [*] percent ([*]%); (ii) if Net Sales of a particular Licensed Product
are between than [*] U.S. Dollars (U.S. $[*]) and [*] U.S. Dollars (U.S. $[*]),
the royalty payable shall be [*] percent ([*]%); and (iii) if Net Sales of a
particular Licensed Product exceed [*] U.S. Dollars (U.S. $[*]), the royalty
payable shall be [*] percent ([*]%). For example, if GSK is entitled under
Section 6.12 above to [*] on [*] of a Licensed Product [*] that is co-funded by
CK at the [*] percent ([*]%) level, and GSK's total annual Net Sales for such
Licensed Product is [*] U.S. Dollars (U.S. $[*]), then the royalties due CK
shall [*] percent ([*]%).

            6.14.3 In the event the Parties are unable to agree on such [*], the
amount of the [*] shall be established in accordance with Section 12.3.1 below.
In any event, however, the [*] shall only apply for so long as the circumstances
and conditions described in Sections 6.12 and 6.13 above continue to exist, and
shall only apply to [*] on [*] of the particular Licensed Product [*].

      6.15 [*]. In the event that a [*] in [*] or [*], other than a GSK
Affiliate or Sublicensee, for the Licensed Product, and as a result, the
conditions of Section 6.13 apply, then it is understood that [*] may be entitled
to a [*] in accordance with Section 6.14 above, as a result of such [*].

                         ARTICLE VII - COMMERCIALIZATION

      7.1 Commercialization Rights. Subject to the provisions of Section 7.4
below, GSK shall be responsible for the establishment, control and
implementation of the strategy, plans and budgets for marketing and promotion of
the Licensed Products.

*  Certain information on this page has been omitted and filed separately with
   the Commission. Confidential treatment has been requested with respect to the
   omitted portions.

                                     - 56 -
<PAGE>
      7.2 Commercialization Committee.

            7.2.1 Establishment. No later than at the initiation of the first
Phase III clinical study for a Licensed Product, the Parties shall establish a
Joint Commercialization Committee ("JCC"). The JCC shall have responsibility to
monitor the conduct and progress of the commercialization strategy, plans, and
budgets, including establishment of a plan and budget for the marketing,
promotion, sale and distribution of such Licensed Product (each a "Sales and
Marketing Plan"). The JCC shall update the Sales and Marketing Plan
periodically, and no less often than annually, and shall include therein
detailed plans and budgets for the marketing, promotion, sale and distribution
of each Licensed Product.

            7.2.2 Meetings; Information. The JCC shall meet at least monthly.
GSK shall notify CK at least two weeks in advance of the date of each JCC
meeting, and CK shall have the opportunity to send [*] to each such meeting, who
shall be designated as [*] of the JCC. Either Party may replace its respective
JCC representative(s) at any time with prior written notice to the other Party.
GSK shall provide such [*] with schedules of all such meetings, as well as any
other information distributed to GSK members of the JCC. GSK agrees to keep CK
informed regarding the Sales and Marketing Plan (including by providing CK at
least quarterly such reports regarding shipments and sales of Licensed
Products), and the activities being undertaken with respect to the
commercialization of the Licensed Product, and shall consider all reasonable
suggestions of CK in formulating and implementing the Sales and Marketing Plan.
GSK shall have right of final decision regarding all matters under the
jurisdiction of the JCC, subject to Section 7.2.3 below.

            7.2.3 Section 4.5 Products. With respect to any Licensed Product for
which GSK exercised the CK Product Option under Section 4.5 above, then for all
matters pertaining to such Licensed Product: (i) the JCC shall be comprised of
an equal number of representatives of each of GSK and CK, (ii) decisions of the
JCC shall be by majority vote, provided that if there is not an equal number of
representatives of each Party voting, then only an equal number of
representatives of each Party shall be entitled to vote on the matter, and (iii)
notwithstanding Section 7.2.2 above, GSK shall not have the right of final
decision with respect to such matters.

      7.3 Commercialization Efforts.

            7.3.1 Generally. GSK shall use diligent efforts to discover,
research, develop and commercialize Licensed Products, and to perform its
obligations under Sections 2.1, 3.1-3.3 and 7.1 of this Agreement, and to obtain
the optimum commercial return for each Licensed Product in all major markets
throughout the world, consistent with high professional standards for the
research, development, commercialization, and marketing of pharmaceutical
products of similar commercial value potential. GSK shall develop and
commercialize Licensed Products in the best interests of maximizing the success
of such Licensed Product.

            7.3.2 Reversion to CK. If after the second anniversary of the
Exclusivity Period, or with respect to a particular Collaboration Target that
was an Extended Target, the second anniversary of the end of the Extension
Period under Section 4.2 with respect to such Collaboration Target, (i) GSK is
not actively and diligently performing IND Enabling Studies, or human clinical
trials or pursuing Marketing Approval with respect to a Development Compound or
Licensed

*  Certain information on this page has been omitted and filed separately with
   the Commission. Confidential treatment has been requested with respect to the
   omitted portions.

                                     - 57 -
<PAGE>
Product directed to a Collaboration Target, and (ii) is not then actively
marketing a Licensed Product directed to such Collaboration Target, then such
Target shall cease to be a Collaboration Target for all purposes of this
Agreement and shall thereafter be deemed a CK Target. Notwithstanding the
foregoing, if prior to or during the period described in this Section 7.3.2, GSK
has conducted IND Enabling Studies or clinical trials of a Development Compound
or Licensed Product directed to a particular Collaboration Target, but later
ceased such Studies or trials, then such Target shall not so cease to be a
Collaboration Target by reason of this Section 7.3.2 if GSK has then ongoing and
is actively conducting a [*] Program with respect to such Collaboration Target,
and satisfies the conditions of (i) above within thirty-six (36) months after
the prior IND Enabling Studies and clinical trials ceased, whichever is later.
It is understood that this Section 7.3.2 shall not be deemed to limit Sections
4.2.1 or 7.3.1 above.

            7.3.3 After the Exclusivity Period, if GSK acquires a product that
is directed to a Mitotic Kinesin Target, GSK shall continue to commit resources
to the discovery, development and commercialization of Compounds, Development
Compounds and Licensed Products hereunder for their maximal commercial success
and in a manner that will not disadvantage the Licensed Product to the benefit
of the newly acquired product. In addition, in the event GSK is required by a
regulatory agency to divest a Licensed Product in North America or a Major
European Country, CK shall have the first right to negotiate with GSK to acquire
full rights to such Licensed Product on commercially reasonable terms. GSK shall
provide written notice to CK of its intent to divest the Licensed Product prior
to entering into any agreement with a Third Party, shall use commercially
reasonable efforts to reach such an agreement with CK, and shall provide
reasonable assistance to CK with respect to its discussions with the relevant
governmental authority(ies) overseeing the divestiture of such Licensed Product,
including encouraging the relevant governmental authority(ies) to select CK as
the acquirer of the Licensed Product. It is understood that any agreement for
CK's acquisition of the Licensed Product would be subject to agreement between
the Parties on the financial terms and other conditions of CK's acquisition of
the Licensed Product.

      7.4 Co-Promotion Option of CK. Provided that CK has exercised its
Co-Funding Option under Section 3.4 or 4.5.2(d) with respect to a Licensed
Product, at any time prior to the MAA submission for a Licensed Product in the
United States and Canada (respectively), CK will have an option (the
"Co-Promotion Option") to co-promote such Licensed Product in the United States
and/or Canada (respectively) according to the terms and conditions set forth in
this Section 7.4. This Co-Promotion Option may be exercised, at CK's discretion,
on a product-by-product basis, for each Licensed Product with respect to which
CK has exercised its Co-Funding Option and has participated in funding [*] for
such Licensed Product under Section 3.4 or for which GSK exercised the CK
Product Option under Section 4.5 above. CK shall notify GSK of its intent to
exercise its Co-Promotion Option with respect to a particular Licensed Product
at any time prior to submission of an MAA for such Licensed Product (each such
Licensed Product for which CK exercises the Co-Promotion Option being referred
as a "Co-Promoted Product"). As used in this Section 7.4, "co-promote" shall
mean to promote jointly a Licensed Product through GSK and CK's respective sales
forces under a single trademark in a given country; "details" shall mean
face-to-face sales presentations made to physicians, nurses, pharmacists and
other individuals who provide health care services to patients, in their
capacity as such.

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            7.4.1 Scope of Co-Promotion. At such time as CK exercises its
Co-Promotion Option with respect to a Co-Promoted Product, it shall notify GSK
of the [*] that CK intends to perform annually for such Co-Promoted Product
(such total being referred to as the "Co-Promotion Percentage" for such
Co-Promoted Product) in each of the United States and Canada. This Co-Promotion
Percentage shall not be greater than [*] percent ([*]%), nor less than [*]
percent ([*]%), of the [*], in each of the United States and Canada, [*] to be
conducted for such Co-Promoted Product in any calendar year, unless otherwise
agreed by the Joint Commercialization Committee. CK shall have the right to [*]
over the initial [*] ([*]) years of co-promoting a Co-Promoted Product; provided
that CK must commit to [*] at least [*] percent ([*]%) of [*] in the [*], and
[*] percent ([*]%) of such commitment in the [*], calendar year of such
Co-Promoted Products.

            7.4.2 [*]. The Parties recognize that CK, under its Co-Promotion
Option, may receive orders from Third Parties for the Co-Promoted Product. CK
shall transmit such orders to GSK and [*].

            7.4.3 Co-Promotion Coordination. The JCC shall be responsible for
coordinating the co-promotion activities under this Section 7.4, and shall
develop the strategies and programs to optimally carry-out details, including
but not limited to, the assignment of details in accordance with the Sales and
Marketing Plan. In the event CK exercises its Co-Promotion Option, the Sales and
Marketing Plan shall include detailed plans and budgets for the [*], and shall
at all times provide for CK sales representatives to conduct the [*] to be
conducted in the particular country (subject to CK's right to [*] CK's [*], as
described in Section 7.4.1 above); provided that such [*] be [*], and that [*]
will include at least a [*] in the particular therapeutic areas.

            7.4.4 Co-Promotion Obligations. CK shall employ a professional and
trained sales force to co-promote the Co-Promoted Product in the country(s) in
which it has elected to co-promote, and such sales force shall meet standards of
competence and professionalism as is common in the pharmaceutical industry. With
the prior written consent of GSK (which shall not be withheld or delayed
unreasonably), CK may sub-contract its Co-Promotion obligations to a Third
Party, provided that CK has the right to approve the hiring of sales personnel
performing details for a Licensed Product hereunder and to cause the removal
from such detailing activities of such sales personnel. In all events, CK's
Co-Promotion and detailing shall be conducted in accordance with the then
current Sales and Marketing Plan and in accordance with all applicable laws. [*]
(including samples) as are reasonably necessary to effectively promote the
particular Co-Promoted Product consistent with the Sales and Marketing Plan.

            7.4.5 Reimbursement. GSK shall reimburse CK for the costs incurred
by CK in [*] in accordance with this Section 7.4, [*]. Promptly following CK's
exercise of the Co-Promotion Option for a particular Co-Promoted Product, the
Parties shall reasonably agree [*] to be paid to CK for [*] performed by CK in
accordance with the Sales and Marketing Plan then in effect (the "[*]"). Such
[*] shall equal CK's [*] cost of performing [*] over the particular period, on a
fully allocated basis, provided that the [*] shall not exceed [*] for the
Co-Promoted Product ([*]) for the [*] period. The [*] shall be paid to CK
quarterly in advance, based on the [*] budgeted to be conducted by CK during
such quarter under the Sales and Marketing Plan. Promptly following the end of
each calendar quarter, CK shall provide to GSK a report, in a form reasonably
agreed by the Parties, summarizing the [*] actually [*] during such quarter. In
the event the actual [*] was less than the [*]

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for which CK received advance payment, then GSK shall be entitled to a credit
for the [*] associated with such shortfall against the next payment due to CK
under this Section 7.4.5.

            7.4.6 CK and GSK Right to Terminate. CK shall have the right to
terminate its Co-Promotion of any Co-Promoted Product, and its obligations under
this Article VII with respect to such Product, on a product-by-product,
country-by-country basis, upon [*] ([*]) days prior notice to GSK. Upon such
termination by CK, CK shall have no further right to [*] under Section 7.4.5,
other than for services provided prior to the date of termination. GSK shall
have the right to terminate CK's Co-Promotion of any Co-Promoted Product, on a
product-by-product, country-by-country basis, upon [*] ([*]) days prior notice
to CK, in the event that employees or consultants promoting the Co-Promoted
Product, do not perform in accordance with GSK's Sales and Marketing Plan for
the Co-Promoted Product, and CK fails to correct such non-performance during
such [*]-day period. Upon such termination by GSK, CK shall have no further
right to [*] under Section 7.4.5, other than for services provided prior to the
date of termination.

      7.5 CK Logo. The name and logo of CK shall appear, with reasonable size
and prominence, on all packaging, package inserts, labeling, marketing and sales
materials and advertisements for Licensed Products for which CK exercised the
Co-Funding Option under Section 3.4 above. In the case of such Co-Funded
Products that became Licensed Products pursuant to Section 4.5 above, the name
and logos of CK and GSK shall be of equal size and prominence.

       ARTICLE VIII - OWNERSHIP OF INTELLECTUAL PROPERTY AND PATENT RIGHTS

      8.1 Ownership.

            8.1.1 Generally. Each Party shall retain all of its rights, title
and interest in and to its Existing Technology, including the right to transfer
or license such intellectual property to others for any purpose, subject only to
its obligations under this Agreement, including but not limited to the
exclusivity obligations below. All right, title and interest in and to all
inventions made solely by personnel of a Party shall be owned by such Party. All
right, title and interest in and to all other inventions made jointly by
personnel of GSK and CK shall be jointly owned by GSK and CK in equal and
undivided shares. Except as expressly provided in this Agreement, neither Party
shall have any obligation to account to the other for profits, or to obtain any
consent of the other Party to license or exploit patented jointly-owned subject
matter, by reason of joint ownership thereof, and each Party hereby waives any
right it may have under the laws of any jurisdiction to require any such consent
or accounting.

            8.1.2 CK Targets. Notwithstanding the foregoing, all inventions and
Information (including all Patents and intellectual property rights in such
inventions and Information) made by CK personnel in connection with activities
specifically pertaining to CK Targets, CK Compounds or CK Products shall be
owned by CK. All inventions and Information (including all Patents and
intellectual property rights in such inventions and Information) made by GSK
personnel in connection with activities specifically pertaining to CK Targets,
CK Compounds or CK Products shall be owned by GSK, and GSK hereby grants to CK
an exclusive, worldwide license, with the right to grant and authorize
sublicenses, to make, have made, use, sell, offer for sale, import and otherwise
exploit subject matter within such inventions, Information or intellectual
property. It is

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understood that the inventions and Information licensed to CK under this Section
shall be limited to inventions and Information that pertain to CK Targets, CK
Compounds or CK Products prior to their designation as such (e.g., with respect
to CK Targets prior to the time that the particular Mitotic Kinesin Target had
been designated as a CK Target).

      8.2 Patent Filings. The Party responsible for Prosecution and Maintenance
(as defined below) of patents covering inventions within the Collaboration
Technology or Post-Collaboration Technology shall use [*] to obtain a reasonable
scope of protection of Compounds and CK Compounds, and will consider in good
faith reasonable comments provided by the other Party.

            8.2.1 Joint Patents. The Prosecution and Maintenance of jointly
owned Patents shall be only as mutually agreed by GSK and CK. In such
connection, the Parties agree to cooperate in good faith to obtain appropriate
patent protection for Compounds, Licensed Products, CK Compounds, and CK
Products. Accordingly, the Parties agree to cooperate and to prepare and
prosecute patent applications for Patents within the Licensed Technology
directed to such claims in a manner that ensures reasonable scope of protection
for such subject matter. Subject always to the foregoing, [*] will be
responsible at the expense of [*] for drafting, filing, prosecuting and
maintaining any jointly owned Patent directed primarily to Compounds, including
but not limited to processes for making Compounds, methods of use of Compounds
or intermediates of such.

            8.2.2 Solely Owned Patents. GSK or CK, as the case may be, shall
control the Prosecution and Maintenance of Patents within the Collaboration
Technology and Post-Collaboration Technology that are owned by such Party, in
each case [*] and using counsel of its choice and in such countries as such
Party determines is appropriate.

            8.2.3 Other Matters Pertaining to Prosecution of Patents.

                  (a) Disclosure. Prior to the filing of any patent claiming
Collaboration Technology, the JRC shall establish a subcommittee to coordinate
Prosecution and Maintenance of patents covering inventions within the
Collaboration Technology and Post-Collaboration Technology (the "Patent
Subcommittee"). After the end of the Research Term, the Patent Subcommittee
shall report to the JSC. Prior to filing any patent application claiming
Collaboration Technology or Post-Collaboration Technology, each Party shall
submit to the Patent Subcommittee an invention disclosure containing such
information and in a form to be mutually agreed by the Parties. Each Party shall
keep the Patent Subcommittee informed as to material developments with respect
to the Prosecution and Maintenance of Patents claiming Collaboration Technology
or Post-Collaboration Technology, including without limitation, by providing
upon request copies of any substantive documents that such Party receives from
any patent office, including notice of all interferences, reissues,
re-examinations, oppositions or requests for patent term extensions, and by
providing the other Party the opportunity to have reasonable input into the
strategic aspects of such Prosecution and Maintenance. Without limiting the
foregoing, neither Party shall file an application for such a Patent unless it
has first disclosed the same to the Patent Subcommittee.

                  (b) If, during the term of this Agreement, the Party
responsible for prosecuting a Patent within the Collaboration Technology or
Post-Collaboration Technology, as specified in this Section 8.2, (the
"Prosecuting Party") intends to allow such Patent to lapse or

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become abandoned without having first filed a substitute, the Prosecuting Party
shall, whenever practicable, notify the other Party of such intention at least
sixty (60) days prior to the date upon which such Patent shall lapse or become
abandoned, and such other Party shall thereupon have the right, but not the
obligation, to assume responsibility for the Prosecution and Maintenance and
defense thereof at its own expense with counsel of its own choice.

                  (c) "Prosecution and Maintenance" or "Prosecute and Maintain"
with regard to a Patent shall mean the preparing, filing, prosecuting and
maintenance of such Patent, as well as re-examinations, reissues, requests for
patent term extensions and the like with respect to such Patent, together with
the conduct of interferences, the defense of oppositions and other similar
proceedings with respect to the particular Patent.

      8.3 Patent Costs.

            8.3.1 Collaboration and Post-Collaboration Technology. Each Party
shall be responsible for costs associated with the Prosecution and Maintenance
of such Patents within the Collaboration Technology or Post-Collaboration
Technology that it owns solely. CK and GSK shall share the Patent Costs
associated with the Prosecution and Maintenance of jointly owned Patents, as the
Parties agree.

            8.3.2 CK and GSK Existing Technology. CK shall be responsible for
[*] percent ([*]%) of the Patent Costs incurred by CK prior to and after the
Effective Date in all countries in the Territory with respect to CK Existing
Technology. GSK shall be responsible for [*] percent ([*]%) of the Patent Costs
incurred by GSK prior to and after the Effective Date in all countries in the
Territory with respect to GSK Existing Technology. If a Party chooses not to
Prosecute and Maintain a Patent within its Existing Technology that it solely
owns in a country or countries of the Territory, it shall use [*] efforts to
promptly notify the other Party of its decision, and, if such patent pertains to
a Collaboration Target, Compound, Development Compound, Licensed Product, CK
Compound or CK Product licensed to the other Party hereunder, the other Party
shall have the right to Prosecute and Maintain such Patent and at its own
expense with counsel of its own choice.

            8.3.3 Definition of Patent Costs. "Patent Costs" shall mean the
reasonable fees and expenses paid to outside legal counsel, and filing,
maintenance and other out-of-pocket expenses paid to Third Parties, incurred in
connection with the Prosecution and Maintenance of Patents.

      8.4 Third Party Technologies.

            8.4.1 Existing Third Party Technology. It is understood that certain
Patents within the CK Existing Technology have been in-licensed pursuant to that
certain Exclusive License Agreement dated April 21, 1998, as modified, among CK,
the Regents of the University of California and the Board of Trustees of the
Leland Stanford Junior University (the "University License"), and that CK shall
be responsible for payment of all partnership and other fees required pursuant
to Section 5.2 thereof. As required for the furtherance of the objectives of
this Agreement, CK shall use [*] to maintain the University License and to
timely pay all fees due under the University License. Should CK be unable to
make any payment required under the University

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License, it shall notify GSK, and GSK shall thereupon have the option to make
such payment on behalf of CK and to seek reimbursement from CK for such payment.

            8.4.2 Acquired After Effective Date. In addition, if after the
Effective Date, CK or GSK (the "Sublicensing Party") acquire from a Third Party
subject matter within the Licensed Technology ("Third Party Technology"), but
that is subject to royalty or other payment obligations to the Third Party, then
the following shall apply: The licenses granted to the other Party (the
"Commercializing Party") under Section 5.2 and 5.3 above with respect to such
Third Party Technology shall be subject to the Commercializing Party's promptly
reimbursing the Sublicensing Party for any milestones, royalties or other
amounts that become owing to such Third Party by reason of the Commercializing
Party's exercise of such license or sublicense to the Third Party Technology.
Upon request by the Commercializing Party, the Sublicensing Party shall disclose
to the Commercializing Party a true, complete and correct written description of
such payment obligations, and the Commercializing Party's obligation to
reimburse such amounts following such request shall be limited to those payment
obligations as so disclosed by the Commercializing Party, with any such payments
made [*] under [*] (to the extent [*] applies). In the event that the
Commercializing Party does not promptly reimburse the Sublicensing Party for
such amounts upon request, then such Third Party Technology shall thereafter be
deemed excluded from the Licensed Technology. Notwithstanding the foregoing,
neither Party shall utilize in performing the Research Program any Third Party
Technology that would impose a royalty or other payment obligation to a Third
Party for which the other Party would become responsible under this Section
8.4.2 with respect to a Licensed Product or CK Product, unless the JRC has
approved such utilization.

      8.5 Enforcement Rights.

            8.5.1 Defense and Settlement of Third Party Claims. If a Third Party
asserts that a Patent or other right owned by it is infringed by the
manufacture, use, sale or importation of any Licensed Product, [*] shall have
the primary right but not the obligation to defend against any such assertions
at its cost and expense. In the event [*] elects to defend against any such
Third Party claims, [*] shall have the sole right to direct the defense of any
such Third Party claims and to elect to settle such claims. In any event, the
Parties shall assist one another and cooperate in any such litigation at the
other's request without expense to the requesting Party. Each Party may at its
own expense and with its own counsel join any defense brought by the other
Party.

            8.5.2 Infringement by Third Parties.

                  (a) If any Patent within the Licensed Technology Controlled by
CK is infringed by a Third Party in any country in connection with the
manufacture, use and sale of a product substantially similar to a Licensed
Product in such country, GSK shall have the primary right, but not the
obligation to institute, prosecute, and control any action or proceeding with
respect to such infringement of such Patent, by counsel of its own choice, and
CK shall have the right, at its own expense, to be represented in that action by
counsel of its own choice. If GSK fails to bring an action or proceeding within
a period of [*] ([*]) days after a request by CK to do so, CK shall have the
right to bring and control any such action by counsel of its own choice, and GSK
shall have the right to be represented in any such action by counsel of its own
choice at its own expense.

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                  (b) If any Patent within the Licensed Technology that is
Controlled by GSK is infringed by the manufacture, sale or importation of a
product substantially similar to a CK Product, CK shall have the primary right,
but not the obligation, to institute, prosecute, and control any action or
proceeding with respect to such infringement of such Patent, by counsel of its
own choice, and GSK shall have the right, at its own expense, to be represented
in that action by counsel of its own choice. If CK fails to bring an action or
proceeding within a period of [*] ([*]) days after a request by GSK to do so,
GSK shall have the right to bring and control any such action by counsel of its
own choice, and CK shall have the right to be represented in any such action by
counsel of its own choice at its own expense.

                  (c) If one Party brings any such action or proceeding in
accordance with this Section 8.5.2, the second Party agrees to be joined as a
party plaintiff and to give the first Party reasonable assistance and authority
to file and prosecute the suit. The costs and expenses of the Party bringing
suit under this Section shall be borne by such Party, and any damages or other
monetary awards recovered shall be shared as follows: The amount of such
recovery actually received by the Party controlling such action shall first be
applied to the out-of-pocket costs of such action, and then shall be shared (a)
in the event of an action with respect to an infringing product substantially
similar to a Licensed Product, CK shall receive a percentage of such net
recovery equal [*] that would have been payable to CK with respect to such
Licensed Product (without giving effort to Sections [*] or [*] above) (e.g., if
CK were entitled [*] for such Licensed Product, CK would be entitled to receive
[*] of the net recovery), and GSK shall be entitled to the remainder of such net
recovery; and (b) in the event of an action with respect to an infringing
product substantially similar to a CK Product, GSK shall receive a percentage of
such net recovery equal to [*] that would be payable to GSK under this Agreement
with respect to such CK Product, and CK shall be entitled to the remainder of
such net recovery. A settlement or consent judgment or other voluntary final
disposition of a suit under this Section 8.5.2(c) may be entered into without
the consent of the Party not bringing the suit; provided that such settlement,
consent judgment or other disposition does not admit the invalidity or
unenforceability of any Patent within the Licensed Technology and provided
further, that any rights to continue the infringing activity in such settlement,
consent judgment or other disposition shall be limited to those rights that the
granting Party otherwise has the right to grant.

                  (d) General. Subject to Paragraphs (a), (b) and (c) above,
with respect to jointly owned Patents, each Party may proceed in such manner as
the law permits. Each Party shall bear its own expenses, and any recovery
obtained by either Party may be retained by such Party unless otherwise agreed.

                          ARTICLE IX - CONFIDENTIALITY

      9.1 Confidentiality; Exceptions. Except to the extent expressly authorized
by this Agreement or otherwise agreed in writing, the Parties agree that the
receiving Party shall keep confidential and shall not publish or otherwise
disclose or use for any purpose other than as provided for in this Agreement any
Information and other confidential and proprietary information and materials
furnished to it by the other Party pursuant to this Agreement or any Information
developed during the term of this Agreement (collectively, "Confidential
Information"), except to the extent that it can be established by the receiving
Party that such Confidential Information:

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                  (i) was in the lawful knowledge and possession of the
receiving Party prior to the time it was disclosed to, or learned by, the
receiving Party, or was otherwise developed independently by the receiving
Party, as evidenced by written records kept in the ordinary course of business,
or other documentary proof of actual use by the receiving Party;

                  (ii) was generally available to the public or otherwise part
of the public domain at the time of its disclosure to the receiving Party;

                  (iii) became generally available to the public or otherwise
part of the public domain after its disclosure and other than through any act or
omission of the receiving Party in breach of this Agreement; or

                  (iv) was disclosed to the receiving Party, other than under an
obligation of confidentiality, by a Third Party who had no obligation to the
disclosing Party not to disclose such information to others.

      9.2 Authorized Disclosure. Except as expressly provided otherwise in this
Agreement, each Party may use and disclose Confidential Information of the other
Party as follows: (i) under appropriate confidentiality provisions substantially
equivalent to those in this Agreement, in connection with the performance of its
obligations or exercise of rights granted or reserved in this Agreement
(including the rights to commercialize Licensed Products and CK Products and to
grant licenses and sublicenses hereunder), or (ii) to the extent such disclosure
is reasonably necessary in filing or prosecuting patent, copyright and trademark
applications, complying with the terms of licenses from Third Parties with
respect to a Party's Existing Technology, prosecuting or defending litigation,
complying with applicable governmental regulations, obtaining regulatory
approval, conducting preclinical or clinical trials, marketing Licensed Products
or CK Products, or otherwise required by law, provided, however, that if a Party
is required by law or regulation to make any such disclosure of the other
Party's Confidential Information it will, except where impracticable for
necessary disclosures, for example in the event of medical emergency, give
reasonable advance notice to the other Party of such disclosure requirement and,
except to the extent inappropriate in the case of patent applications, will use
its reasonable efforts to secure confidential treatment of such Confidential
Information required to be disclosed or (iii) in communication with investors,
consultants, advisors or others on a need to know basis, in each case under
appropriate confidentiality provisions substantially equivalent to those of this
Agreement, or (iv) to the extent mutually agreed to by the Parties.

      9.3 Termination of Prior Agreement. This Agreement supersedes the
Confidentiality Agreement between the Parties (or their predecessors) dated May
18, 2000 (including amendments) and the Materials Transfer Agreement between the
Parties dated May 18, 2000, including all modifications. All information
exchanged between the Parties under that Agreement shall be deemed Confidential
Information and shall be subject to the terms of this Article IX.

      9.4 Publications. Each Party shall submit any proposed publication
containing Confidential Information to the other Party at least [*] ([*]) days
in advance to allow that Party to review such planned public disclosure. The
reviewing Party will promptly review such proposed publication and make any
objections that it may have to the publication of Confidential Information

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of the reviewing Party contained therein. Should the reviewing Party make an
objection to the publication of any such Confidential Information, then the
Parties shall discuss the advantages and disadvantages of publishing such
Confidential Information. If the Parties are unable to agree on whether to
publish the same, subject to Section 12.1 below, the JRC shall attempt to
resolve the matter. If the JRC is unable to resolve the matter promptly, the
Chief Executive Officer of CK and the Chairman, Research and Development,
Pharmaceuticals of GSK shall reasonably agree on the extent to which the
publication of such Confidential Information shall be made.

      9.5 Limit on Disclosure of Information Relating to Mitotic Kinesin
Targets. Notwithstanding Section 9.2(i) above:

                  (a) for both Parties during the Exclusivity Period and any
Extension Period, on a Target-by-Target basis with respect to any Mitotic
Kinesin Targets that have not been designated as a Collaboration Target or a CK
Target,

                  (b) for CK, for the duration of its obligation under Section
4.2.3 with respect to a particular Collaboration Target and with respect to
matters pertaining specifically to such Collaboration Target, and

                  (c) for GSK, with respect to matters relating to CK Targets,

such Party in question shall not disclose to a Third Party any CK Existing
Technology, GSK Existing Technology, Collaboration Technology or
Post-Collaboration Technology specifically directed to matters within the Field
specifically pertaining to such Mitotic Kinesin Target(s), such as
structure/activity relationship data, target validation data and the like;
provided, however, that CK shall have the right to disclose such data in (b)
above (other than data that is directed specifically to one or more Mitotic
Kinesin Targets other than CK Targets) (i) in connection with research and
development on CK Targets, CK Compounds and CK Products, or (ii) in connection
with commercialization of CK Products (subject to GSK's CK Product Option under
Section 4.5); and provided, further, that GSK shall have the right to disclose
such data in (c) above (other than data that is directed specifically to one or
more Mitotic Kinesin Targets other than Collaboration Targets) (i) in connection
with research and development on Collaboration Targets, Compounds, Development
Compounds and Licensed Products, or (ii) in connection with commercialization of
Licensed Products. This Section 9.5 shall not be deemed to restrict CK's
disclosure of any such Licensed Technology in connection with activities
pertaining to (x) performance of its obligations under the Research Program, (y)
[*] or [*] after such [*] are excluded from the Field pursuant to Section 2.6.4,
or (z) any disclosure authorized under Section 9.2(ii), (iii) or (iv) above.

                   ARTICLE X - REPRESENTATIONS AND WARRANTIES;
                          COVENANTS AND INDEMNIFICATION

      10.1 Representations and Warranties. Each of the Parties hereby represents
and warrants and covenants as follows:

                  (a) This Agreement is a legal and valid obligation binding
upon such Party and enforceable in accordance with its terms. Except as
otherwise noted in Exhibit 10.1

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hereto, the execution, delivery and performance of the Agreement by such Party
does not conflict with any agreement, instrument or understanding, oral or
written, to which it is a party or by which it is bound, nor violate any law or
regulation of any court, governmental body or administrative or other agency
having jurisdiction over it.

                  (b) Other than the notification requirements under the
Hart-Scott-Rodino ("HSR") Act and approval of the transaction contemplated by
this Agreement by the Federal Trade Commission ("FTC"), no government
authorization, consent, approval, license, exemption of or filing or
registration with any court or governmental department, commission, board,
bureau, agency or instrumentality, domestic or foreign, under any applicable
laws, rules or regulations currently in effect, is or will be necessary for, or
in connection with, the transaction contemplated by this Agreement or any other
agreement or instrument executed in connection herewith, or for the performance
by it of its obligations under this Agreement and such other agreements.

                  (c) Each Party has not, and during the term of the Agreement
will not, grant any right to any Third Party relating to its respective
technology in the Field which conflicts with the rights granted to the other
Party hereunder. Each Party will not, during the Exclusivity Period or Extension
Period, as applicable, encumber its respective CK Patents or GSK Patents within
the Licensed Technology, as applicable, with liens, mortgages, security
interests or another similar interest that would give the holder the right to
convert the interest into patent ownership, unless the encumbrance is expressly
subject to the licenses herein.

                  (d) Each Party owns or otherwise controls all of the rights,
title and interest in and to its Patents and Know-How within the Licensed
Technology.

                  (e) Each Party has no present knowledge from which it
concludes that the CK Patents or GSK Patents within the Licensed Technology, as
applicable, are invalid or that their exercise would infringe patent rights of
Third Parties.

                  (f) Each Party has not omitted to furnish the other with any
information requested by the other Party, or intentionally concealed from the
other Party any information in its possession concerning the Mitotic Kinesin
Targets or the transactions contemplated by this Agreement which would be
material to the other Party's decision to enter into this Agreement and to
undertake the commitments and obligations set forth herein.

      10.2 Indemnification.

            10.2.1 Indemnification by GSK. GSK hereby agrees to indemnify,
defend and hold CK and its agents, directors and employees harmless from and
against any and all suits, claims, actions, demands, liabilities, expenses
and/or loss, including reasonable legal expense and attorney's fees ("Losses")
resulting directly from the development, manufacture, use, handling, storage,
sale or other disposition of chemical agents or Licensed Products by GSK, its
Affiliates, agents or Sublicensees.

            10.2.2 Indemnification by CK. CK hereby agrees to indemnify, defend
and hold GSK and its agents, directors and employees harmless from and against
any and all Losses resulting
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directly from the development, manufacture, use, handling, storage, sale or
other disposition of chemical agents or CK Products by CK, its Affiliates,
agents or Sublicensees.

            10.2.3 Procedure. In the event a Party is seeking indemnification
under Sections 10.2.1 or 10.2.2, it shall inform the other Party (the
"Indemnifying Party") of a claim as soon as reasonably practicable after it
receives notice of the claim, shall permit the Indemnifying Party to assume
direction and control of the defense of the claim (including the right to settle
the claim) and shall cooperate as requested (at the expense of the Indemnifying
Party) in the defense of the claim.

      10.3. Covenants of the Parties.

                  (a) Upon the terms and subject to the conditions hereof, each
of the Parties hereto shall use its good faith efforts, before the Closing to
(i) take, or cause to be taken, all actions necessary, proper or advisable under
applicable law or otherwise to consummate and make effective the transactions
contemplated by this Agreement, (ii) make all necessary filings, and thereafter
make any other advisable submissions, with respect to this Agreement and the
transactions contemplated by this Agreement required under the HSR Act; provided
that, with respect to this clause (a), neither GSK nor CK shall be required to
agree to any modification or amendment that, in the reasonable opinion of the
Party's legal and/or financial counsel, would be adverse to such Party. The
Parties hereto shall cooperate with each other in connection with the making of
all such filings. The Parties hereto shall furnish all information required for
any application or other filing to be made pursuant to the rules and regulations
of any applicable law in connection with the transactions contemplated by this
Agreement.

                  (b) GSK and CK shall file as soon as practicable (but not
later than five (5) business days) after the Effective Date notifications under
the HSR Act and shall respond as promptly as practicable to all inquiries or
requests received from the FTC, the Antitrust Division of the Department of
Justice, for additional information or documentation and shall respond as
promptly as practicable to all inquiries and requests received from any such
authority (including any state attorney general) in connection with antitrust
matters. The Parties shall cooperate with each other in connection with the
making of all such filings or responses. GSK agrees to pay the filing fees and
all associated costs for required HSR filings related to this Agreement.

                        ARTICLE XI - TERM AND TERMINATION

      11.1 Term. Unless earlier terminated, the Agreement and the payment
obligations under Article VI will continue in effect, on a product-by-product
and country-by-country basis until the later of (i) the expiration of the last
to expire Patent within the Licensed Technology covering such Compound or
Licensed Product in such country, or (ii) fifteen (15) years after the date of
the first commercial sale of such Licensed Product in such country. Effective
upon the expiration (but not earlier termination) of this Agreement, CK hereby
grants to GSK a fully-paid-up, royalty-free license under CK Existing Technology
and CK's interest in Collaboration Technology and Post-Collaboration Technology
to make, have made, use and sell the Development Compounds and Licensed Products
in the Territory without further payment or consideration to CK. Effective upon
the expiration of this Agreement, GSK hereby grants to CK a fully-paid-up,
royalty-free license,

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under GSK Existing Technology and GSK's interest in Collaboration Technology and
Post-Collaboration Technology, to make, have made, use and sell the CK Compounds
and CK Products, in the Territory without further payment or consideration to
GSK.

            11.1.1 Termination Prior to Closing. This Agreement may be
terminated at any time prior to the Closing:

                  (a) by GSK or CK, if all applicable waiting periods for the
HSR filing made in connection with this Agreement have not lapsed or been
terminated early by August 1, 2001 or the FTC initiates an investigation into
the transaction contemplated by this Agreement; or

                  (b) by GSK or CK, if the Closing has not occurred by August 1,
2001; or

                  (c) by the mutual written consent of GSK and CK.

      11.2 Termination For Breach. Either Party may terminate this Agreement in
the event the other Party shall have materially breached or defaulted in the
performance of any of its material obligations hereunder, and such default shall
have continued for ninety (90) days after written notice thereof was provided to
the breaching party by the non-breaching party. Any termination shall become
effective at the end of such ninety (90) day period unless the breaching party
(or any other party on its behalf) has cured any such breach or default prior to
the expiration of the ninety (90) day period.

      11.3 Termination Upon Notice.

            11.3.1 Termination by GSK on Notice. GSK may terminate this
Agreement upon six (6) months written notice to CK, provided that such notice is
given after the fifth anniversary of the Effective Date; and provided further
that if GSK extends the Research Term in accordance with Section 2.8 above, such
termination may not take effect prior to the end of the Research Term.

            11.3.2 Termination by GSK on a Product-by-Product Basis. In addition
GSK may terminate this Agreement as to any particular Licensed Product by so
notifying CK, which termination shall be effective six (6) months after the date
of such notice; provided, however, if the Research Term has ended and as a
result of such termination: (i) GSK is not actively performing substantial
research and/or development activities with respect to a Collaboration Target or
any Compound, Development Compound or Licensed Product directed to the
Collaboration Target that is so terminated, and is not then actively marketing a
Licensed Product directed to such Collaboration Target, then such Target shall
cease to be a Collaboration Target for all purposes of this Agreement, and shall
thereafter be deemed a CK Target; or (ii) GSK is not then actively pursuing
substantial research and/or development activities or human clinical trials with
respect to any Collaboration Target, Compound, Development Compound or Licensed
Product directed to any Collaboration Target, and is not then actively marketing
a Licensed Product directed to any Collaboration Target, then the termination of
such Licensed Product shall be deemed a termination of this Agreement in its
entirety under Section 11.3.1 above. This Section 11.3.2 shall not be deemed to
limit Sections 4.2.1 or 7.3.2 above.

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<PAGE>
            11.3.3 Termination by CK on Notice. If at any time after the
Research Term the conditions in clause (ii) of Section 11.3.2 above are met
(i.e., regardless of whether GSK has formally terminated a particular Licensed
Product under Section 11.3.2), CK shall have the right to terminate this
Agreement upon six (6) months notice to GSK.

      11.4 Termination on Bankruptcy. Either Party may terminate this Agreement,
if, at any time, the other Party shall file in any court or agency pursuant to
any statute or regulation of any state or country, a petition in bankruptcy or
insolvency or for reorganization or for an arrangement or for the appointment of
a receiver or trustee of the Party or of substantially all of its assets, or if
the other Party proposes a written agreement of composition or extension of
substantially all of its debts, or if the other Party shall be served with an
involuntary petition against it, filed in any insolvency proceeding, and such
petition shall not be dismissed within sixty (60) days after the filing thereof,
or if the other Party shall propose or be a party to any dissolution or
liquidation, unless in connection with such dissolution or liquidation this
Agreement is assigned under Section 12.5, or if the other Party shall make an
assignment of substantially all of its assets for the benefit of creditors.

      11.5 Intentionally left blank.

      11.6 Certain Payment Terms.

            11.6.1 Milestone Payments. Notwithstanding anything herein to the
contrary, GSK shall not be obligated to pay any payment otherwise payable under
Section 6.3 as a result of occurrence of a Research Performance Milestone or
under Section 6.4 as the result of occurrence of a Development Milestone if the
Research Performance Milestone or Development Milestone occurs after (i) a
termination notice is properly given pursuant to Section 11.3 above or (ii) a
termination pursuant to Section 11.2 above by reason of a breach by CK.
Similarly, in the event that GSK terminates this Agreement with respect to a
particular Licensed Product in accordance with Section 11.3.2 above, GSK shall
not be obligated to pay any payment under Section 6.4 above as the result of
occurrence of a Development Milestone with respect to such terminated Licensed
Product if the milestone event occurs after a notice of such termination is
properly given by GSK pursuant to Section 11.3.2.

      11.7 Effect of Termination.

            11.7.1 Termination Prior to Closing. Notwithstanding any other
provision of this Agreement, in the event that this Agreement is terminated
pursuant to Section 11.1.1, this Agreement shall be deemed terminated ab initio,
and notwithstanding Section 11.7.3 below, no provisions of this Agreement shall
survive such termination. All amounts paid prior to the date of such termination
shall be non-refundable; provided that CK shall promptly reimburse to GSK any
amounts paid to CK under Sections 3.1.2 (a), 6.2 or 6.3 above. All Confidential
Information disclosed prior to such termination shall be deemed Confidential
Information pursuant to the Confidentiality Agreement (as amended) between the
Parties dated May 18, 2000, which Confidentiality Agreement shall survive.

      11.7.2 Accrued Rights, Surviving Obligations. Termination, relinquishment
or expiration of the Agreement for any reason shall be without prejudice to any
obligations which shall

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have accrued prior to such termination, relinquishment or expiration, including,
without limitation, the payment obligations under Article 6 hereof and any and
all damages arising from any breach hereunder.

            11.7.3 Survival. Except as provided under Section 11.7.1, Articles
1, 10, 11 and 12 (other than Section 12.2) and Sections 8.1, 8.3, 9.1, and 9.2
shall survive the expiration and any termination of this Agreement; and Article
5 shall survive the expiration but not an earlier termination (except as
provided below) of this Agreement. In addition, the following provisions shall
survive termination of this Agreement in the events set forth below:

                  (a) Certain Terminations. In the event of a termination of
this Agreement pursuant to Section 11.3, or termination by CK pursuant to
Section 11.2: (i) Section 4.4.2 shall survive, and all Licensed Products,
Compounds and Collaboration Targets shall be deemed CK Products, CK Compounds
and CK Targets, respectively; (ii) without limiting any other provisions of this
Section 11.7.3, CK's rights and GSK's obligations (but not GSK's rights or CK's
obligations) under Sections 2.4, 8.2.3 and 8.4.2 and under the last two
sentences of Section 3.2 shall survive; (iii) Sections 5.3 and 5.4.2 shall
survive, and in addition, CK shall have an irrevocable, exclusive, worldwide
license, with the right to grant and authorize sublicenses, under GSK's interest
in the Collaboration Technology and Post-Collaboration Technology, and any
trademarks owned by GSK and used specifically by GSK to identify the Licensed
Products (excluding the GlaxoSmithKline trade name and trade dress) to make,
use, sell, import and otherwise exploit products directed to Mitotic Kinesin
Targets for use in the Field (without giving effect to any modification under
Section 2.6.4), including the right to practice any invention within such
Technology for the purpose of conducting research or development activities
directed to such products; and (iv) without limiting the foregoing, GSK's
obligations under Section 4.1.1, 4.1.2 and 4.3.2 above shall continue for the
Exclusivity Period as if the Agreement had not been terminated. From and after
the date of a notice of termination in the events described in this Section
11.7.3(a), CK shall have no further obligations under this Agreement beyond
those obligations that survive termination in such events as specified in this
Section 11.7.3.

                  (b) Breach by CK. In the event of a termination of this
Agreement by GSK pursuant to Section 11.2: (i) in the event that such
termination occurs before the end of the Research Term, those Lead Targets
identified as of the termination effective date but not selected pursuant to
Section 2.7 shall become Collaboration Targets, all other Mitotic Kinesin
Targets shall revert to CK and the licenses granted to GSK under Section 5.1
shall be expanded to include conducting research independently beyond the
Research Term for the purpose of identifying Compounds directed to such
Collaboration Targets, without any further payment by GSK to CK (subject to
(b)(ii)); (ii) the provisions of Article 6 (other than 6.2) and Sections 5.2
(other than 5.2.4), 5.4, 4.1.3 and 7.3.1, and GSK's rights and CK's obligations
(but not CK's rights or GSK's obligations) under Sections 2.4, 8.2.3 and 8.4.2
shall survive and, in addition, GSK shall have an irrevocable, non-exclusive,
worldwide license, with the right to grant and authorize sublicenses, under CK's
interest in the Collaboration Technology and Post-Collaboration Technology, to
make, use, sell, import and otherwise exploit products directed to Collaboration
Targets for use in the Field (without giving effect to any modification under
Section 2.6.4), including the right to practice any invention within such
Technology for the purpose of conducting research or development activities
directed to such products; and (iii) without limiting the foregoing, CK's
obligations under

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<PAGE>
Section 4.1.1 and 4.1.2 above shall continue for the Exclusivity Period as if
the Agreement had not been terminated. From and after the date of a notice of
termination in the events described in this Section 11.7.3(b), GSK shall have no
further obligations under this Agreement beyond those obligations that survive
termination in such events as specified in this Section 11.7.3.

                  (c) Termination under Section 11.3.3. In the event CK provides
notice to GSK of its intent to terminate this Agreement pursuant to Section
11.3.3, then, with respect to any CK Compound or CK Product for which CK had
begun IND Enabling Studies that would otherwise be subject to the CK Product
Option, but for which CK has not completed [*] ([*]) [*] studies, prior to the
date of such notice (each, a "Potential Option Product"), GSK may exercise its
CK Product Option pursuant to Section 4.5, as follows:

                        (i) Upon request by GSK within thirty (30) days after
receiving CK's notice of termination under Section 11.3.3, GSK may request that
CK notify GSK of such Potential Option Products (the "GSK Information Request").
Within thirty (30) days after receiving such GSK Information Request, CK shall
notify GSK of such Potential Option Products, together with a copy of any IND
that has been filed by CK with respect to such Potential Option Product as of
the date of such notice by CK (the "CK Notice"). Then, within [*] ([*]) days
after GSK's receipt of the CK Notice, GSK may exercise the CK Product Option
with respect to such Potential Option Products (i.e., as if CK had completed [*]
([*]) [*] studies for such Potential Option Products and provided GSK a proper
CK [*] Notice therefore in accordance with Section 4.5). In such case, and
solely for purposes of such case, (i) the first three sentences of Section 4.5
shall not apply to GSK's exercise of the CK Product Option for such Potential
Option Products, (ii) notwithstanding Section 4.5.2(d) or any other provision of
Section 4.5, CK shall not be obligated to exercise the Co-Funding Option with
respect to any Potential Option Product for which GSK exercises the CK Product
Option under this Section 11.7.3, and (iii) CK's obligations under Section 4.6
shall thereafter terminate.

                        (ii)In the event that GSK so exercises the CK Product
Option with respect to one or more Potential Option Products, then CK's notice
of termination described above shall not be effective under Section 11.3.3, and
this Agreement shall continue in force and effect, subject to the terms and
conditions hereof. However, in such case, upon such exercise by GSK, all
Collaboration Targets and Unselected Targets shall be deemed CK Targets
(notwithstanding Sections 2.7, 2.8, 4.2 or any other provision of this
Agreement), all Compounds, Development Compounds and Licensed Products shall be
deemed CK Compounds and CK Products, and the CK Product Option shall terminate
with respect to all such CK Targets, and all CK Compounds and CK Products
directed to such CK Targets (i.e., all rights of GSK under Section 4.5 shall
terminate with respect to CK Products directed to all Mitotic Kinesin Targets
other than those that were CK Targets at the time of CK's notice of termination
under Section 11.3.3). Once GSK has exercised the CK Product Option under this
Section 11.7.3(c), GSK shall not have any further right under this Section
11.7.3(c) upon a subsequent termination by CK under Section 11.3.3.

      11.8 Termination Not Sole Remedy. Termination is not the sole remedy under
this Agreement and, whether or not termination is effected, all other remedies
will remain available except as agreed to otherwise herein.

*  Certain information on this page has been omitted and filed separately with
   the Commission. Confidential treatment has been requested with respect to the
   omitted portions.

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                           ARTICLE XII - MISCELLANEOUS

      12.1 Publicity.

            12.1.1 Financial Terms. Each of the Parties hereto agrees not to
disclose to any Third Party the financial terms of this Agreement without the
prior written consent of the other Party hereto, except to advisors, investors
and others on a need-to-know basis under circumstances that reasonably ensure
the confidentiality thereof, or to the extent necessary to comply with the terms
of licenses from Third Parties with respect to a Party's Existing Technology, or
to the extent required by law. Notwithstanding the foregoing, following the
Effective Date, the Parties shall agree upon a press release to announce the
execution of this Agreement together with a corresponding Question & Answer
outline for use in responding to inquiries about the Agreement; thereafter, GSK
and CK may each disclose to Third Parties the information contained in such
press release and Question & Answer outline without the need for further
approval by the other.

            12.1.2 Publicity Review. The Parties acknowledge the importance of
supporting each other's efforts to publicly disclose results and significant
developments regarding Licensed Products, CK Products and other activities in
connection with this Agreement, beyond what is required by law, and each Party
may make such disclosures from time to time with the approval of the other
Party, which approval shall not be unreasonably withheld or delayed. Such
disclosures may include, without limitation, achievement of Research Performance
Milestones, Development Milestones, significant events in the research,
development and regulatory process with respect to such a Development Compound,
Licensed Product or CK Product, commercialization activities and the like. When
a Party (the "Requesting Party") elects to make any such public disclosure under
this Section 12.1.2, it will give the other Party (the "Cooperating Party") at
least five (5) business days notice to review and comment on such statement, it
being understood that if the Cooperating Party does not notify the Requesting
Party in writing within such five day period of any reasonable objections, as
contemplated in this Section 12.1.2, such disclosure shall be deemed approved,
and in any event the Cooperating Party shall work diligently and reasonably to
agree on the text of any proposed disclosure in an expeditious manner. The
principles to be observed in such disclosures shall be accuracy, compliance with
applicable law and regulatory guidance documents, reasonable sensitivity to
potential negative reactions of the FDA (and its foreign counterparts) and the
need to keep investors informed regarding the Requesting Party's business.
Accordingly, the Cooperating Party shall not withhold its approval of a proposed
disclosure that complies with such principles.

      12.2 Overall Management of Collaboration.

            12.2.1 Joint Steering Committee. The Parties shall establish an
overall committee ("Joint Steering Committee") to review and coordinate the
conduct of the collaboration under this Agreement. The Joint Steering Committee
shall be comprised of three (3) members each from CK and GSK, with the members
selected from senior management of each Party. Unless otherwise agreed, the
Joint Steering Committee shall at all times include [*]. The Joint Steering
Committee shall meet at least annually, or as more frequently as is requested by
either Party, to review and discuss the performance of the collaboration. All
other committees under this Agreement shall be subordinate to the Joint Steering
Committee.

*  Certain information on this page has been omitted and filed separately with
   the Commission. Confidential treatment has been requested with respect to the
   omitted portions.

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<PAGE>
            12.2.2 Mutual Decisions. CK and GSK shall cause each of their
representatives on the JRC, JDC, or any other committee established under this
Agreement to vote, and shall otherwise perform their respective activities under
this Agreement, in the best interests of the collaboration contemplated herein,
including the timely research, development and commercialization of Compounds,
Development Compounds, Licensed Products and not in the present or future
interest of either Party outside the collaboration. Where this Agreement calls
for specified officers of CK and GSK to meet and resolve a particular issue,
each Party shall make its respective officer reasonably available for an
in-person meeting on at least three particular dates and times within the thirty
(30) days after the request.

      12.3 Short-Form Arbitration.

            12.3.1 Certain Disputes.

                  (a) If the Parties do not agree upon (i) a matter to be
decided by the JDC, or the JCC, for which [*] does not have the right to [*]
(i.e., pursuant to the last sentence of Section [*], or under Section [*],
above) or the JRC (e.g., pursuant to Sections 2.2 and 2.3.2); or (ii) the
royalty terms to be established under Section 4.7 above; (iii) whether one or
more amounts are required to be reimbursed under Section 3.4.4 or 4.5.2(a); or
(iv) a dispute under Section 6.12, 6.13 or 6.14 above, then such matters in
issue shall be determined by binding arbitration conducted pursuant to this
Section 12.3.1 by one (1) arbitrator. In such arbitration, the arbitrator shall
be an independent expert (including in the area of the dispute) in the
pharmaceutical or biotechnology industry mutually acceptable to the Parties. If
the Parties are unable to agree on an arbitrator, the arbitrator shall be an
independent expert as described in the preceding sentence selected by the chief
executive of the Chicago office of the American Arbitration Association.

                  (b) In the event of a dispute under (a) above, (i) each Party
shall prepare a written report setting forth its position with respect to the
substance of the dispute and (ii) in the case of a dispute under (a)(i), (a)(ii)
or (a)(iv) above (but not under (a)(iii)), the arbitrator shall select one of
the Party's positions as his decision, and shall not have authority to render
any substantive decision other than to so select the position of either GSK or
CK. Except as provided in the preceding clause (ii) such arbitration shall be
conducted in all respects under the rules of the American Arbitration
Association.

                  (c) The costs of any arbitration under this Section 12.3.1
shall be shared equally by the Parties, and each Party shall bear its own
expenses in connection with such arbitration. The Parties shall use diligent
efforts to cause the completion of any such arbitration within ninety (90) days
following a request by any Party for such arbitration.

            12.3.2 Disputes as to CK Products. In the event that GSK disputes
under Section 2.6.4 or 4.5 above CK's right to develop or otherwise
commercialize products under Section 2.6.4 or 4.5 above, GSK shall initiate an
arbitration proceeding under this Section 12.3.2 within [*] ([*]) days of its
receipt of notice from CK that CK intends to so develop or otherwise
commercialize such a compound, product or Mitotic Kinesin Target. If GSK does
not initiate such arbitration within such [*] ([*]) day period, it shall have no
further right to dispute CK's right to develop and commercialize such
compound(s), product(s) or Target(s). Any such dispute shall be finally settled
by binding

*  Certain information on this page has been omitted and filed separately with
   the Commission. Confidential treatment has been requested with respect to the
   omitted portions.

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arbitration in Chicago under the Licensing Rules of American Arbitration
Association by a single arbitrator appointed in accordance with such rules. The
arbitrator shall be a retired federal judge with experience trying patent cases,
and the Parties shall use their respective best efforts to obtain a final
determination by the arbitrator within sixty (60) days after the initiation of
such proceeding. THE FOREGOING REMEDY SHALL BE THE PARTIES' SOLE AND EXCLUSIVE
REMEDY WITH RESPECT TO ANY DISPUTE DESCRIBED IN THIS SECTION 12.3.2.

            12.3.3 Retention of Rights. Nothing in this Section 12.3 shall
preclude GSK or CK from resorting to judicial or equitable remedies for any
disputes not within Section 12.3.1 or 12.3.2.

      12.4 Governing Law. This Agreement and any dispute arising from the
performance or breach hereof shall be governed by and construed and enforced in
accordance with the laws of the State of New York, U.S.A., without reference to
conflicts of laws principles.

      12.5 Assignment.

            12.5.1 General. This Agreement shall not be assignable by either
Party to any Third Party hereto without the written consent of the other Party
hereto. Notwithstanding the foregoing, either Party may assign this Agreement,
without the written consent of the other Party, to an Affiliate or to an entity
that acquires all or substantially all of the business or assets of such Party
to which this Agreement pertains (whether by merger, reorganization,
acquisition, sale or otherwise), and agrees in writing to be bound by the terms
and conditions of this Agreement. Notwithstanding the foregoing, either Party
may assign and/or delegate any rights and/or obligations hereunder without the
consent of the other Party to an Affiliate that is at least ninety percent (90%)
owned by such Party, or, in the case of GSK, to an Affiliate that is at least
ninety percent (90%) owned, directly or indirectly, by the ultimate parent of
Glaxo Group Limited (for so long as such Party or parent maintains at least that
level of ownership); provided in each case, however, that such assignment shall
not relieve the assigning Party of any of its obligations hereunder. It is
understood that the provisions of Section 12.5.2 shall apply in the event of
assignment of this Agreement under the circumstances described therein. If any
permitted assignment would result in withholding or other similar taxes becoming
due on payments to the other Party under this Agreement, the assigning Party
shall be responsible for all such taxes and the amount of such taxes shall not
be withheld or otherwise deducted from the amounts payable to such other Party.
If, in such event, such other Party actually reduces the amount of income tax
paid by such Party as a result of using a credit for the amount of such
withholding or similar taxes paid by the assigning Party, then such other Party
shall promptly refund to the assigning Party the amount of such reduction in
income tax resulting from the use of such credit. No assignment and transfer
shall be valid and effective unless and until the assignee/transferee shall
agree in writing to be bound by the provisions of this Agreement. The terms and
conditions of this Agreement shall be binding on and inure to the benefit of the
permitted successors and assigns of the Parties.

            12.5.2 Certain Matters Relating to Acquisitions. In the event of an
assignment of this Agreement to a Third Party, or another transaction in which a
Third Party becomes an Affiliate of CK that controls CK (as "control" is defined
in Section 1.2 above) (each such event, a "Subject Transaction"), then the
following shall apply:

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                  (a) Notwithstanding the definitions of Collaboration
Technology, Post-Collaboration Technology, CK Patents and CK Know-How, CK
Existing Technology, Cytometrix Technology, Compounds, Development Compounds,
Licensed Products, CK Compounds, CK Products, CK Library Compounds, or Mitotic
Kinesin Targets (together, "Collective CK Technologies"), the Collective CK
Technologies shall not include any intellectual property or subject matter (the
"Previously Existing Subject Matter") that, prior to the Subject Transaction,
was held or Controlled by such Third Party (or an Affiliate of such Third Party
that was not an Affiliate of CK at the time of such assignment or transaction,
each such Third Party and Affiliate being referred to as a "Subsequently
Affiliated Company") and GSK shall have no right or license under this Agreement
to any such Previously Existing Subject Matter except as may be agreed under
Section 12.5.2(b)(i) or (b)(ii) below.

                  (b) If, at the time of the Subject Transaction, the
Subsequently Affiliated Company had [*], or [*] for the [*] of [*] to [*] which
is then subject to [*] under Section [*] or [*], then:

                        (i) CK in its sole discretion, may elect to [*],
including any [*], with the [*] efforts under this Agreement, on the same terms
and conditions.

                        (ii)If CK does not make the election in (i), then, on
request by either Party, GSK and CK shall meet, together with representatives of
the Subsequently Affiliated Company, to discuss [*] to [*] activities, including
all relevant [*], on such terms as the parties may agree. It is understood that
any such [*] would [*] involve a [*] of the [*] granted to CK and GSK hereunder.
It is understood, however, that neither GSK nor CK shall be obligated to enter
into any agreement to so [*]. In the event the Parties do not agree to so [*],
then the provisions of subparagraphs (iii)-(vii) below shall apply.

                        (iii) Following the Subject Transaction, the [*]
immediately prior to the Subject Transaction (the "[*] ") shall [*] and [*] to
those that were [*] to research activities (A) in the Research Program and (B)
which generate [*] that would reasonably accrue to the Research Program or that
are reasonably necessary for CK to fulfill its obligations under the Research
Program, to the extent CK would otherwise have [*] and [*] had the Subject
Transaction not occurred. The obligations under this paragraph (b)(iii) shall
terminate on the [*] of the Effective Date of this Agreement.

                        (iv)[*] shall not disclose non-public Collaboration
Technology, Post-Collaboration Technology or GSK Existing Technology to any
Subsequently Affiliated Company for use in connection with the research,
development or commercialization of products within the Field, the primary mode
of pharmacological action of which is through the inhibition of one or more
Mitotic Kinesin Targets, other than those CK Targets for which the CK Product
Option under Section 4.5 above does not apply at that time (i.e., CK Products
directed to such CK Targets would not be subject to the CK Product Option) (such
Mitotic Kinesin Targets, excluding such CK Targets, being referred to as
"Restricted Mitotic Kinesin Targets"), unless [*] could have disclosed such item
to a Third Party.

*  Certain information on this page has been omitted and filed separately with
   the Commission. Confidential treatment has been requested with respect to the
   omitted portions.

                                     - 76 -
<PAGE>
                        (v) No Subsequently Affiliated Company shall have any
license under Collaboration Technology, Post-Collaboration Technology, GSK
Existing Technology, or CK Existing Technology for any purpose unless such
license could also be granted to a Third Party herein.

                        (vi)The Parties shall use diligent efforts to put
procedures in place to [*] of GSK or CK Confidential Information to a
Subsequently Affiliated Company that would not [*] Third Party herein and to
prevent [*] of any [*], including requiring each Party's representatives on the
JRC, JDC, JSC and any employees performing research in connection with this
Agreement to [*] agreeing to comply with the [*] of this Agreement. Without
limiting the foregoing, any employee of [*] immediately prior to the Subject
Transaction who is transferred to a Subsequently Affiliated Company shall [*]
with respect to a Restricted Mitotic Kinesin Target at any Subsequently
Affiliated Company or in collaboration with personnel of such Subsequently
Affiliated Company, for so long as [*] activities with respect to such
Restricted Mitotic Kinesin Target are prohibited under Section 4.1.2 or 4.2.3
above.

                        (vii) Notwithstanding the foregoing, the conditions of
subparagraphs (iii)-(vi) above shall be deemed satisfied in all respects, if
such [*] (or its successor) is maintained and operated as an independent
company. Such entity shall be deemed to be operated as an independent company
if, after the Subject Transaction (A) [*] can remain fully bound under all terms
and conditions of this Agreement, (B) [*] has the capability to perform as would
have CK prior to the Subject Transaction for all purposes under this Agreement
and (C) [*] and the Subsequently Affiliated Company contractually commit that
there shall be no disclosures or licenses with respect to Licensed Technology
under this Agreement from [*] to the Subsequently Affiliated Company that would
not have been either (x) permitted to be disclosed or granted to a Third Party
under this Agreement or (y) permitted to be used or disclosed by CK for its
independent efforts under this Agreement.

                  (c) Unless this Agreement is [*] under Section 12.5.2(b)(i) or
(ii) above, the Collective CK Technologies shall not include any intellectual
property or subject matter created or acquired by such Subsequently Affiliated
Company following the Subject Transaction, and no activities of the Subsequently
Affiliated Company shall be deemed within the Research Program. It is
understood, however, that if Cytokinetics, Inc. (i.e., the Party to this
Agreement) is legally merged with and into another corporate entity, then the
resulting merged corporate entity shall be fully bound by all provisions of this
Agreement and shall not be a "Subsequently Affiliated Company" under this
Section 12.5.2.

                  (d) Subject to the foregoing and paragraph (b) above, Sections
4.1.2 and 4.2.3 shall not apply with respect to activities of the Subsequently
Affiliated Company. In addition, subject to paragraph (b) above, Section
2.6.4(b) shall not apply to a Subsequently Affiliated Company, and no officer or
representative of a Subsequently Affiliated Company shall be required or
permitted to serve on the JRC or JSC (e.g., under Section 2.2(a) above).

            12.5.3 Certain Additional Matters on Change of Control of CK.
Notwithstanding the provisions of Section 12.5.2, in the event CK assigns this
Agreement (i) to [*] US Dollars ($[*]), or in (ii) the event that CK merges or
consolidates or enters into a similar transaction with such a

*  Certain information on this page has been omitted and filed separately with
   the Commission. Confidential treatment has been requested with respect to the
   omitted portions.

                                     - 77 -
<PAGE>
pharmaceutical or biotechnology entity in which such entity becomes an Affiliate
of CK, and, in either case, then upon request by GSK, the Parties will each use
their respective diligent efforts to put procedures into place to [*] under any
of Section 2.2, 3.2, 3.5, 7.2 and/or 7.4 above, including, without limitation,
requiring each Party's representatives on the JRC, JDC, JSC and any employees
performing research in connection with this Agreement to [*] agreeing to comply
with the [*] of this Agreement. It is understood that the provisions of Section
12.5.2 may also apply in the event of the occurrence of the events described in
this Section 12.5.3.

      12.6 Performance Warranty. Each Party hereby warrants and guarantees the
performance of any and all rights and obligations by its Affiliate(s).

      12.7 Notices. All notices, requests and communications hereunder shall be
in writing and shall be personally delivered or sent by facsimile transmission
(confirmed by prepaid registered or certified mail, return receipt requested or
by international express delivery service) (e.g., Federal Express), mailed by
registered or certified mail (return receipt requested), postage prepaid, or
sent by international express courier service, and shall be deemed to have been
properly served to the addressee upon receipt of such written communication, to
following addresses of the Parties, or such other address as may be specified in
writing to the other Party hereto:

IF TO CK,

                  ADDRESSED TO:     CYTOKINETICS, INC.
                                    280 East Grand Avenue
                                    South San Francisco, California 94080
                                    Attention: Robert Blum,
                                               Vice President, Business
                                                 Development
                                    Telephone: (650) 624-3002
                                    Telecopy:  (650) 624-3010

                  WITH COPY TO:     WILSON SONSINI GOODRICH & ROSATI
                                    PROFESSIONAL CORPORATION
                                    650 Page Mill Road
                                    Palo Alto, CA  94304-1050
                                    Attention: Kenneth A. Clark, Esq.
                                    Telephone:  (650) 493-9300
                                    Telecopy:    (650) 493-6811

IF TO GSK,

                  ADDRESSED TO:     GLAXO GROUP LIMITED, DOING BUSINESS AS
                                    GLAXOSMITHKLINE
                                    709 Swedeland Road
                                    King of Prussia, Pennsylvania 19406
                                    Attention:  Vice President, Business
                                                  Development
                                    Telephone:  (610) 270-5973
                                    Telecopy:   (610) 270-5962

*  Certain information on this page has been omitted and filed separately with
   the Commission. Confidential treatment has been requested with respect to the
   omitted portions.

                                     - 78 -
<PAGE>
                  WITH A COPY TO:   GLAXOSMITHKLINE
                                    Corporate Legal Department
                                    One Franklin Plaza
                                    200 N. 16th Street / FP 2360
                                    Philadelphia, PA 19103

                                    Attention:  Senior Vice President and
                                                  Assistant General Counsel-R&D
                                                  Legal Operations
                                    Telephone:  215-751-4000
                                    Telecopy:   215-751-3935

      12.8 Waiver. Neither Party may waive or release any of its rights or
interests in this Agreement except in writing. The failure of either Party to
assert a right hereunder or to insist upon compliance with any term or condition
of this Agreement shall not constitute a waiver of that right or excuse a
similar subsequent failure to perform any such term or condition. No waiver by
either Party of any condition or term in any one or more instances shall be
construed as a continuing waiver of such condition or term or of another
condition or term.

      12.9 Severability. If any provision hereof should be held invalid, illegal
or unenforceable in any jurisdiction, the Parties shall negotiate in good faith
a valid, legal and enforceable substitute provision that most nearly reflects
the original intent of the Parties and all other provisions hereof shall remain
in full force and effect in such jurisdiction and shall be liberally construed
in order to carry out the intentions of the Parties hereto as nearly as may be
possible. Such invalidity, illegality or unenforceability shall not affect the
validity, legality or enforceability of such provision in any other
jurisdiction. In the event a Party seeks to avoid a provision of this Agreement
by asserting that such provision is invalid, illegal or otherwise unenforceable,
the other Party shall have the right to terminate this Agreement upon sixty (60)
days' prior written notice to the asserting Party, unless such assertion is
eliminated and the effect of such assertion cured within such sixty (60) day
period. Any termination in accordance with the foregoing sentence shall be
deemed a termination pursuant to Section 11.3.1 if the Party who made such
assertion was GSK, and shall be deemed a termination under Section 11.2 by
reason of a breach by CK, if CK is the Party who made such assertion.

      12.10 Entire Agreement. This Agreement and the accompanying Stock Purchase
Agreement set forth all the covenants, promises, agreements, warranties,
representations, conditions and understandings between the Parties hereto and
supersede and terminate all prior agreements and understanding between the
Parties. There are no covenants, promises, agreements, warranties,
representations, conditions or understandings, either oral or written, between
the Parties other than as set forth herein and therein. No subsequent
alteration, amendment, change or addition to this Agreement shall be binding
upon the Parties hereto unless reduced to writing and signed by the respective
authorized officers of the Parties.

      12.11 Independent Contractors. Nothing herein shall be construed to create
any relationship of employer and employee, agent and principal, partnership or
joint venture between the Parties. Each Party is an independent contractor.
Neither Party shall assume, either directly or indirectly, any liability of or
for the other Party. Neither Party shall have the authority to bind or obligate
the other Party and neither Party shall represent that it has such authority.

                                     - 79 -
<PAGE>
      12.12 Headings. Headings used herein are for convenience only and shall
not in any way affect the construction of or be taken into consideration in
interpreting this Agreement.

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

                             ARTICLE XIII - CLOSING

      13.1 Upon the terms and subject to the conditions of this Agreement, the
closing of this Agreement and the closing of the Stock Purchase Agreement shall
take place at a closing (the "Closing") to be held at the offices of Wilson
Sonsini Goodrich & Rosati, at 10:00 A.M. Pacific Daylight Time on such date as
agreed by the Parties (the "Closing Date"), or at such other place or at such
other time contemporaneous with satisfaction of the last closing condition as
GSK and CK may mutually agree upon in writing.

                                     - 80 -
<PAGE>
      IN WITNESS WHEREOF, the Parties have executed this Agreement in duplicate
originals by their duly authorized representatives as of the date and year first
above written.

CYTOKINETICS, INC.                                GLAXO GROUP LIMITED,
                                                  A GLAXOSMITHKLINE CORPORATION

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

                                     - 81 -
<PAGE>
                                  EXHIBIT 1.17

                                COMPOUND CRITERIA

                                      [*]

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   the Commission. Confidential treatment has been requested with respect to the
   omitted portions.
<PAGE>
                                  EXHIBIT 1.55

                             [*] PROGRAM ACTIVITIES

                                       [*]

*  Certain information on this page has been omitted and filed separately with
   the Commission. Confidential treatment has been requested with respect to the
   omitted portions.
<PAGE>
                                  EXHIBIT 1.65

                           TRACTABLE COMPOUND CRITERIA

                                      [*]

*  Certain information on this page has been omitted and filed separately with
   the Commission. Confidential treatment has been requested with respect to the
   omitted portions.
<PAGE>
                                   EXHIBIT 2.5

                          DEVELOPMENT COMPOUND CRITERIA

                                      [*]

*  Certain information on this page has been omitted and filed separately with
   the Commission. Confidential treatment has been requested with respect to the
   omitted portions.
<PAGE>
                                  EXHIBIT 4.5.1

                              CLINICAL REPORT FORM

                                       [*]

*  Certain information on this page has been omitted and filed separately with
   the Commission. Confidential treatment has been requested with respect to the
   omitted portions.
<PAGE>
                                  EXHIBIT 6.3.2

                                FEASIBILITY STUDY

                                      [*]

*  Certain information on this page has been omitted and filed separately with
   the Commission. Confidential treatment has been requested with respect to the
   omitted portions.
<PAGE>
                                EXHIBIT 6.3.2(B)

                                       [*]

*  Certain information on this page has been omitted and filed separately with
   the Commission. Confidential treatment has been requested with respect to the
   omitted portions.
<PAGE>
                                  EXHIBIT 6.4.4

                                       [*]

*  Certain information on this page has been omitted and filed separately with
   the Commission. Confidential treatment has been requested with respect to the
   omitted portions.
<PAGE>
                                  EXHIBIT 10.1

                             THIRD PARTY AGREEMENTS

<TABLE>
<CAPTION>
                                                            AGREEMENT WITH
EFFECTIVE DATE                COMPANY/CONSULTANT              CYTOKINETICS
<S>                           <C>                           <C>
[*]                                   [*]                          [*]
[*]                                   [*]                          [*]
[*]                                   [*]                          [*]
[*]                                   [*]                          [*]
[*]                                   [*]                          [*]

</TABLE>

*  Certain information on this page has been omitted and filed separately with
   the Commission. Confidential treatment has been requested with respect to the
   omitted portions.<PAGE>
                                                                  EXHIBIT 10.30

[*]   CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY
      BRACKETS, HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND
      EXCHANGE COMMISSION PURSUANT TO RULE 406 OF THE SECURITIES EXCHANGE ACT OF
      1933, AS AMENDED.

AZ AND CK CONFIDENTIAL

                       COLLABORATION AND LICENSE AGREEMENT

      THIS COLLABORATION AND LICENSE AGREEMENT (this "AGREEMENT") is made and
entered into as of the 15th day of December, 2003 (the "EFFECTIVE DATE") by and
between Cytokinetics, Inc. a Delaware corporation, having a place of business at
280 East Grand Avenue, South San Francisco, CA 94080 ("CK") and AstraZeneca AB,
a company incorporated in Sweden under no. 556011-7482 with offices at S-151 85
Sodertalje, Sweden ("AZ"). CK and AZ are each referred to herein by name or as a
"PARTY" or, collectively, as "PARTIES."

                                    RECITALS

      A. WHEREAS CK has developed Cytometrix(TM)* cellular phenotyping
technologies for compound profiling (the "CM SYSTEM," as further defined below);

      B. WHEREAS AZ is performing internal projects aimed at the discovery and
development of novel therapeutic products; and

      C. WHEREAS CK and AZ wish to collaborate on a research program utilizing
AZ and CK's knowledge, skills, and proprietary technology to develop a module of
the CM System for use as an in vitro predictor of hepatotoxicity.

      NOW, THEREFORE, in consideration of the promises and mutual covenants
herein contained, and for other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the Parties hereto agree as
follows:

                            ARTICLE I - DEFINITIONS

      Unless otherwise specifically provided in this Agreement, the following
capitalized terms shall have the following meanings as used in this Agreement:

      1.1 "AFFILIATE" means, with respect to a Person, any Person that Controls,
is Controlled by or is under common Control with such first Person. For purposes
of this Section 1.1 only, "CONTROL" means (a) to possess, directly or
indirectly, the power to direct the management or policies of a Person, whether
through ownership of voting securities or by contract relating to voting rights
or corporate governance, or (b) to own, directly or indirectly, fifty percent
(50%) or more of the outstanding voting securities or other ownership interest
of such Person; provided

----------

     *Cytometrix(TM) is a trademark of Cytokinetics, Inc
<PAGE>
AZ AND CK CONFIDENTIAL

that, if local law in any country other than the United States requires a
maximum percentage of local ownership such that the maximum percentage that may,
under such local law, be owned by foreign interests is less than fifty percent
(50%), "CONTROL" means to own the maximum ownership percentage that may, under
such local law, be owned by foreign interests.

      1.2 "APPLICABLE LAW" means the applicable laws, rules and regulations,
including any rules, regulations, guidelines or other requirements of regulatory
authorities that may be in effect from time to time.

      1.3 "AZ BACKGROUND TECHNOLOGY" means any and all Technology Controlled by
AZ as of the Effective Date or during the Research Term (regardless of when
disclosed) and described on EXHIBIT 1.3, or included as AZ Background Technology
pursuant to Section 3.5. The AZ Background Technology excludes (i) any and all
Collaboration Technology and Collaboration Knowledge, and (ii) any and all
Technology provided to CK hereunder by or on behalf of AZ consisting of General
Methods.

      1.4 "AZ COMPOUND" means each Compound intended or provided for use in the
Research Program hereunder by or for AZ, in each case identified by an AZ
Compound identifier listed on EXHIBIT 1.4 and identified therein as Public or
Proprietary, including additional AZ Compounds added pursuant to Section 3.2 and
excluding Compounds removed as Proscribed Compounds pursuant to Section 3.2.

      1.5 "AZ COMPOUND DATA" means data proprietary to AZ and conclusions
derived by or for AZ from such data (other than Collaboration Technology),
existing as of the Effective Date or during the Research Term, comprised of data
and information that describes or otherwise relates to an AZ Compound and (i)
described in, included or required to be provided to CK under Section 3.2 or the
Research Plan, or (ii) otherwise disclosed by AZ to CK in accordance with this
Agreement.

      1.6 "AZ FACILITY(IES)," when used in the singular, means the primary
location at which AZ performs the Research Program, as designated and updated in
accordance with Section 2.3 from time to time; and when used in the plural,
means any and all of AZ's facilities, also as designated and updated in
accordance with Section 2.3 from time to time.

      1.7 "AZ IMPROVEMENTS" means Improvements that are made during the Pilot
License Term that are adaptations or modifications to the Cytometrix(TM)
Hepatotoxicity Module required solely for purposes of achieving compatibility of
the Cytometrix(TM) Hepatotoxicity Module with AZ's information technology or
bioinformatics infrastructure.

      1.8 "AZ KNOWLEDGE" means Technology provided to CK by or on behalf of AZ
during the Research Term for use in the Research Program, which in each case is
not AZ Background Technology, Collaboration Technology, AZ Compounds or AZ
Compound Data.

      1.9 "CHANGE OF CONTROL" means an event in which (i) any Person, other than
the shareholders of a Party as of the Effective Date of the Agreement, acquires
or becomes the beneficial owner of more than fifty percent (50%) of the voting
securities of that Party, (ii) a

                                      -2-
<PAGE>
AZ AND CK CONFIDENTIAL

Party enters into a merger, consolidation or other similar transaction with
another Person or Persons and is not the surviving entity in such transaction,
or (iii) a Party sells to any Person(s) in one or more related transactions all
or substantially all of its consolidated total assets. The public or private
sale of equity securities by the current shareholders of a Party in a single or
related series of transactions shall not constitute a Change in Control unless
as a result of such sale or sales one Person or group of Persons acting in
concert attains control of that Party or acquires or becomes the beneficial
owner of more than fifty percent (50%) of the voting securities of that Party or
such entity into which that Party has merged or consolidated.

      1.10 "CK BACKGROUND TECHNOLOGY" means any and all Technology Controlled by
CK as of the Effective Date or during the Research Term (regardless of when
disclosed) and consisting of the CM System, embodied in CK's proprietary
standard operating procedures described on EXHIBIT 1.10, or included as CK
Background Technology pursuant to Section 3.5. The CK Background Technology
excludes (i) any and all Collaboration Technology and Collaboration Knowledge,
(ii) any and all Technology primarily related to the Prohibited Field, and (iii)
Technology provided to AZ hereunder by or on behalf of CK consisting of General
Methods.

      1.11 "CK COMPOUND" means each Compound intended or provided for use in the
Research Program hereunder by or for CK, in each case identified by a CK
Compound identifier listed on EXHIBIT 1.11 and identified therein as Public or
Proprietary, including additional CK Compounds added pursuant to Section 3.2,
and excluding CK Compounds removed as Proscribed Compounds pursuant to Section
3.2.

      1.12 "CK COMPOUND DATA" means data proprietary to CK and conclusions
derived by or for CK from such data (other than Collaboration Technology),
existing as of the Effective Date or during the Research Term, comprised of data
and information that describes or otherwise relates to a CK Compound, and (i)
described in, included, or required to be provided to AZ under the Research
Plan, or (ii) otherwise disclosed by CK to AZ in accordance with this Agreement.

      1.13 "CK FACILITY" means the primary location at which CK performs the
Research Program, as designated and updated in accordance with Section 2.2 from
time to time.

      1.14 "CK KNOWLEDGE" means Technology provided to AZ by or on behalf of CK
during the Research Term for use in the Research Program, which in each case is
not CK Background Technology, Collaboration Technology, Collaboration Knowledge,
CK Compounds or CK Compound Data.

      1.15 "CM SYSTEM" means that certain Technology Controlled by CK as of the
Effective Date or during the Research Term consisting of the Cytometrix(TM)
cellular phenotyping technologies system employing high-throughput fluidics,
automation, microscopy, imaging analysis and advanced bioinformatics to automate
cellular phenotyping, as described in more detail on EXHIBIT 1.15.

      1.16 "COLLABORATION KNOWLEDGE" means all Technology conceived and/or
reduced to practice or otherwise generated through activities performed under or
in the scope of the

                                      -3-
<PAGE>
AZ AND CK CONFIDENTIAL

Research Program to the extent consisting of General Methods. For clarity,
Collaboration Knowledge excludes all Technology developed in the course of the
Exempt Activities.

      1.17 "COLLABORATION TECHNOLOGY" means all Technology conceived and/or
reduced to practice or otherwise generated through activities performed under or
in the scope of the Research Program, solely by either AZ or CK or jointly by
the Parties, excluding Collaboration Knowledge and excluding any Technology
developed in the course of the Exempt Activities.

      1.18 "COMPOUND" means a unique chemical entity.

      1.19 "COMPOUND DATA" means the AZ Compound Data or the CK Compound Data,
as applicable, and similar data generated pursuant to the Research Program.

      1.20 "CONTRACT YEAR" means a year of 365 days (or 366 days in a leap year)
beginning on the Effective Date and ending one (1) year thereafter and so on
year-by-year. "CONTRACT YEAR ONE" means the first such year; "CONTRACT YEAR TWO"
means the second such year, and so on, year-by-year.

      1.21 "CONTROL" means, with respect to any item of Technology, or a
particular Compound, or the related Intellectual Property Rights thereto, the
possession of the right, whether directly or indirectly, and whether by
ownership, license or otherwise, to disclose, deliver, assign, or grant a
license, sublicense or other right to or under such applicable Technology,
Compound or related Intellectual Property Rights, of the scope and as provided
for herein, without any of the following: (i) violating the terms of any
agreement or other arrangement with any Third Party existing as of the Effective
Date; (ii) the granting Party being required to pay any royalty or other
consideration to any Third Party that would not have been required had the
applicable right or license not been provided under this Agreement; or (iii)
violating any law, regulation, rule, code, order or other requirement of any
federal, state, foreign, local, or other government body or the need for any
additional permits, payments, authorizations, or approvals under any such law,
regulation, rule, code, order or requirement.

      1.22 "CYTOMETRIX(TM) HEPATOTOXICITY MODULE" or "CHM" means that certain
module of the CM System developed in the course of performance and scope of the
Research Program, and directed to in vitro predictions of hepatotoxicity (i.e.,
in vitro image-based assays that can be used to support selection of chemical
entities for drug discovery and development that may have a lower intrinsic
potential to cause liver toxicity).

      1.23 "DELIVERABLES" means certain identified items required to be
delivered or provided by one Party to the other pursuant to the Research
Program, as set forth in EXHIBIT 1.23.

      1.24 "EFFECTIVE DATE" means the date as set forth in the preamble to this
Agreement.

      1.25 "EXEMPT ACTIVITIES" means, with respect to the specific Party
identified on EXHIBIT 1.25, the corresponding activities set forth on EXHIBIT
1.25.

                                      -4-
<PAGE>
AZ AND CK CONFIDENTIAL

      1.26 "FIELD" means the use of imaging-based cellular phenotyping, together
with the use of analysis for the in vitro prediction of hepatotoxicity to
support drug discovery and development. For the avoidance of doubt, "FIELD"
excludes, without limitation, (i) any and all [*] applications (i.e., the direct
or indirect [*]), (ii) [*] applications (i.e., the direct or indirect [*]
whether by [*], [*], [*] or otherwise), (iii) any and all [*] or similar
applications, or uses as a commercial service (e.g., as a service bureau or on
behalf of any Third Party) or product, and (iv) the use of the CM System or any
other Cytometrix(TM) cellular phenotyping and/or analysis technologies or
similar technologies (other than the Cytometrix(TM) Hepatotoxicity Module) to
investigate and engage in activities related to discovery and validation of any
[*] and/or [*].

      1.27 "FTE" means the equivalent of one researcher employed by CK or AZ
having the requisite skills to fulfill CK's or AZ's obligations under this
Agreement and devoting the equivalent hours of a full time employee. For
purposes of this Agreement, "full time" shall mean 1880 hours per year as
determined in accordance with the applicable Party's regular project hour
reporting system.

      1.28 "FULL LICENSE" has the meaning set forth in Section 5.7.

      1.29 "FULL LICENSE TERM" means the period of time during which the Full
License is in effect, beginning as of the date the Full License is first
effective.

      1.30 "GENERAL METHODS" means (a) methods or techniques for (i) cell
culture, (ii) cell plating and conditions therefor, (iii) automation, (iv)
automated image acquisition, (v) variable exposure of cells to treatment, and
(vi) automated addition of treatment and stains; and (b) general knowledge of
use to practitioners of toxicological studies or cellular phenotyping and
analysis.

      1.31 "IMPROVEMENT" means any improvement, adaptation, modification or
upgrade arising during the Pilot License Term and/or the Full License Term.

      1.32 "INTELLECTUAL PROPERTY RIGHTS" means any and all intellectual
property rights in, to, or arising out of any (i) Patents; (ii) trade secrets;
(iii) know-how (iv) copyrights, copyright registrations, or any national or
regional application therefor, in any territory, or any other right
corresponding thereto throughout the world, including moral rights; or (v) any
other intellectual property or proprietary right anywhere in the world,
including rights in or to any data bases, data collections (including knowledge
databases) or software (including any source code or object code form).

      1.33 "JOINT RESEARCH COMMITTEE" or "JRC" means the committee established
pursuant to Section 2.4 herein.

      1.34 "JOINT STEERING COMMITTEE" or "JSC" means the committee established
pursuant to Section 2.5 herein.

      1.35 "PATENT" means any and all rights under any of the following, whether
existing now or in the future: (i) all national, regional and international
patents and patent applications,

* Certain information on this page has been omitted and filed separately with
  the Commission. Confidential treatment has been requested with respect to the
  omitted portions.

                                      -5-
<PAGE>
AZ AND CK CONFIDENTIAL

including provisional patent applications, utility model, design registration,
certificate of invention, patent of addition or substitution, or other
governmental grant for the protection of inventions or industrial designs
anywhere in the world, including any reissue, renewal, re-examination or
extension thereof; and (ii) any application for any of the foregoing, including
any international, provisional, divisional, continuation, continuation-in-part,
or continued prosecution application.

      1.36 "PERFORMANCE CRITERIA" means the functional criteria for performance
of the Cytometrix(TM) Hepatotoxicity Module, as set forth in EXHIBIT 1.36, as
may be revised by the JRC or by mutual written agreement of the Parties.

      1.37 "PERSON" means an individual, sole proprietorship, partnership,
limited partnership, limited liability partnership, corporation, limited
liability company, business trust, joint stock company, trust, incorporated
association, joint venture or similar entity or organization, including a
government or political subdivision, department or agency of a government.

      1.38 "PILOT LICENSE" has the meaning set forth in Section 5.6.1.

      1.39 "PILOT LICENSE TERM" is the period during which the Pilot License is
effective, (A) commencing on the earlier of (i) the date after the last day of
the Research Term or (ii) the date that the prototype Cytometrix(TM)
Hepatotoxicity Module, installed at the CK Facility and used in connection with
CK's infrastructure and instrumentation, first meets the Performance Criteria
therefor, as determined pursuant to Section 3.4, and then (B) continuing until
the earlier of (x) the date that the Cytometrix(TM) Hepatotoxicity Module,
installed at the AZ Facility and used in connection with AZ's infrastructure and
instrumentation, first meets the Performance Criteria therefor, as determined
pursuant to Section 3.4, or (y) the first anniversary of the date of
commencement (as described in clause (A) above) of the Pilot License Term,
subject to extension by mutual written agreement of the Parties.

      1.40 "PRINCIPAL SCIENTIST" means the AZ Principal Scientist or the CK
Principal Scientist, as applicable, as each is defined in Sections 2.3.2 and
2.2.2, respectively.

      1.41 "PROHIBITED FIELD" means any and all research, development or
commercialization activities directed toward any [*] or products for any such
applications.

      1.42 "PROPRIETARY" means (i) with respect to a Compound, that the Party
providing such Compound hereunder Controls Patents which specifically recite and
specifically, but not solely generically, claim the making, possession, use,
sale, import or export of such Compound or has maintained, as a trade secret,
the composition of matter of such Compound, and (ii) with respect to Compound
Data, such data has been maintained as a trade secret by the providing Party.

      1.43 "PROSCRIBED COMPOUND" means:

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            1.43.1 with respect to an AZ Compound, a Compound that is marked
with the development flag in the [*] system. The development flag shall be
applied only to a Compound meeting any of the following criteria: (i) the
Compound is being actively developed; (ii) the Compound is commercially
sensitive to AZ; or (iii) the Compound is an isomer of a Compound described in
clause (i) or (ii). In marking with a development flag any Compound that is an
AZ Compound hereunder, AZ shall apply the same criteria in a manner consistent
with current internal policy and past practice as it does with other Compounds
under similar circumstances.

            1.43.2 with respect to a CK Compound, a Compound that has been
designated as having restricted use within CK. Such restricted use applies only
to a Compound meeting any of the following criteria: (i) the Compound is being
actively developed; (ii) the Compound is commercially sensitive to CK; or (iii)
the Compound is an isomer of a Compound described in clause (i) or (ii). In
designating a Compound as having restricted use, CK shall apply the same
criteria in a manner consistent with current internal policy and past practice
as it does with other Compounds under similar circumstances.

      1.44 "PUBLIC" means (i) with respect to a Compound, such Compound is not
Proprietary, and (ii) with respect to AZ Compound Data or CK Compound Data, such
data is not Proprietary.

      1.45 "RESEARCH PLAN" means the document attached hereto as EXHIBIT 1.45
outlining the Research Program, the budget for the Research Program, and each
Parties' undertakings and obligations, including allocation of FTEs by CK and
AZ, in relation thereto.

      1.46 "RESEARCH PROGRAM" has the meaning described in Section 2.1 hereof.

      1.47 "RESEARCH TERM" means the period beginning on the Effective Date and
continuing for two (2) years thereafter, as may be extended in accordance with
Section 2.7 or by mutual written agreement of the Parties.

      1.48 "TERM" means the period beginning on the Effective Date and
continuing until the earlier of the date upon which this Agreement expires by
its terms, is terminated in accordance with Article VIII, or extended by mutual
written agreement of the Parties.

      1.49 "TECHNOLOGY" means any and all of the following, including tangible
copies and embodiments thereof:

            1.49.1 information and materials (including Compounds) relating to
the subject matter of this Agreement and including data such as test data
(including pharmacological, toxicological and clinical test data) and image data
and in vitro and in vivo data;

            1.49.2 experimental methods and techniques, including those that are
part of or related to assays and cell cultures, screens, models, practices, and
know-how, techniques, trade secrets, and inventions (whether or not patented or
patentable);

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      1.49.3 instrumentation, including selection and arrangement of
instrumentation and setup or calibration settings;

      1.49.4 computer software and code, and related technology, including flow
diagrams, designs, assemblers, applets, compilers, algorithms, routines, design
tools and user interfaces, in source code or object code form; and

      1.49.5 antibodies, markers, cells and cell lines;

      in each case (i) to the extent and for so long as such subject matter or
materials are not generally available in the public domain or otherwise from a
Third Party without restriction, except as a result of a Party's activities in
violation of the terms or conditions of this Agreement, or (ii) to the extent
and for so long as there are protectable Intellectual Property Rights subsisting
in or encompassing those materials. 1.50 "THIRD PARTY" means any Person other
than CK or AZ and the Affiliates of either.

                         ARTICLE II - RESEARCH PROGRAM

      2.1 RESEARCH PROGRAM.

            2.1.1 GENERALLY. CK and AZ agree to conduct a collaborative research
program with the specific goal of creating the Cytometrix(TM) Hepatotoxicity
Module for use in the Field as an in vitro predictor of hepatotoxicity (the
"RESEARCH PROGRAM"). The Research Program shall be conducted solely in
accordance with the Research Plan then in effect unless otherwise mutually
agreed in writing by the Parties or through the JRC in accordance with Section
2.4.4.

            2.1.2 DILIGENT EFFORTS. Each Party shall apply the same diligent
efforts with respect to the Research Program as each, respectively, expends for
its own high priority discovery technology programs. Without limiting the
foregoing, each Party shall apply diligent efforts toward the performance of
activities under the Research Program and allocate personnel and other resources
as reasonably necessary to successfully complete those activities within the
timeframes set forth in the Research Plan then in effect.

            2.1.3 CONTRIBUTIONS. Each Party shall contribute to the Research
Program the items identified in Article III.

      2.2 CK FACILITIES AND CK PRINCIPAL SCIENTIST.

            2.2.1 CK shall provide the facilities, equipment, and manpower that
are reasonably necessary or useful to carry out the work undertaken by CK under
the Research Program at 280 East Grand Avenue, South San Francisco, CA 94080
(the "CK FACILITY"). CK shall have the right to change the location of the CK
Facility upon reasonable advance written notice to AZ.

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            2.2.2 The principal scientist designated by CK (the "CK PRINCIPAL
SCIENTIST") shall be responsible for all Research Program activities undertaken
by CK and shall supervise the work of all personnel engaged by CK in the
Research Program. The CK Principal Scientist shall serve as the primary contact
for AZ on all matters related to the Research Program. The CK Principal
Scientist is [*]. CK may change the CK Principal Scientist, but only to a
similarly qualified individual and only on providing AZ with prior written
notice. Notwithstanding any change in the identity of the CK Principal
Scientist, CK shall continue to be responsible for performing the activities
undertaken by it under the Research Program and any consent or agreement by AZ
pursuant to this Section 2.2.2 shall not be deemed to be a waiver of any right
or remedy AZ may have in relation to any failure of CK to conduct such
activities.

      2.3 AZ FACILITIES AND AZ PRINCIPAL SCIENTIST.

            2.3.1 AZ shall provide the facilities and equipment that are
reasonably necessary or useful to carry out the work undertaken by AZ under the
Research Program at [*] (the "AZ FACILITIES"). To the extent AZ is authorized to
use the Collaboration Technology or CK Background Technology at more than one
facility controlled by AZ, AZ shall designate in writing to CK each such
facility at which it is using the Collaboration Technology or CK Background
Technology. AZ shall provide prompt written updates of changes in the location
of any AZ Facility and AZ shall have the right to change the locations of the AZ
Facilities upon reasonable advance written notice to CK; provided that after
CK's delivery of the Cytometrix(TM) Hepatotoxicity Module such changes shall
only be effective upon CK's written approval.

            2.3.2 The principal scientist designated by AZ (the "AZ PRINCIPAL
SCIENTIST") shall be responsible for all Research Program activities undertaken
by AZ and shall supervise the work of all personnel engaged by AZ in the
Research Program. The AZ Principal Scientist shall serve as the primary contact
for CK on all matters related to the Research Program. The AZ Principal
Scientist is [*]. AZ may change the AZ Principal Scientist, but only to a
similarly qualified individual and only on providing CK with prior written
notice. Notwithstanding any change in the identity of the AZ Principal
Scientist, AZ shall continue to be responsible for performing the activities
undertaken by it under the Research Program, and any consent or agreement by CK
pursuant to this Section 2.3.2 shall not be deemed to be a waiver of any right
or remedy CK may have in relation to any failure of AZ to conduct such
activities.

      2.4 THE JOINT RESEARCH COMMITTEE. Promptly after the Effective Date, the
Parties shall establish a Joint Research Committee (the "JRC") as set forth in
this Section 2.4. The JRC will exist until the end of the Pilot License Term.
Each Party shall keep the JRC informed of its progress and activities within the
Research Program.

            2.4.1 MEMBERSHIP. The JRC shall be comprised of an equal number of
representatives from each of AZ and CK, initially three (3) from each of AZ and
CK, including one lead representative from each Party (who may be but is not
required to be the CK Principal Scientist for CK and the AZ Principal Scientist
for AZ) and any ad hoc members as requested by either Party and approved by the
other Party in writing. For CK, the lead representative is [*]; for AZ, the lead
representative is [*]. A Party may replace its lead representative or other

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representatives to the JRC with other similarly qualified individuals by
providing advance written notice to the other Party.

            2.4.2 MEETINGS. The JRC shall meet regularly during the Research
Term and the Pilot License Term, including face-to-face meetings to be held at
least quarterly, telephone or videoconference calls to be held at least monthly,
with additional regular e-mail and telephone exchanges among the members. The
JRC shall create and agree on written minutes for each meeting of the JRC. The
Parties shall alternate responsibility for chairing the meetings. Each Party
shall bear the expenses of its JRC members related to such members'
participation on the JRC and attendance at JRC meetings.

            2.4.3 RESPONSIBILITIES.

                  (a) The JRC shall have responsibility for: (i) reviewing and
coordinating the Research Program, and for expediting work progress under the
Research Plan currently in effect; (ii) overseeing, reviewing, recommending the
direction of, and allocating resources under the Research Program; (iii)
preparing the Research Plan for each Contract Year (other than Contract Year
One); (iv) adapting and revising the Research Plan, if appropriate; (v)
approving any use of a Third Party's Technology or Intellectual Property Rights
in connection with the Research Program; (vi) tracking and recording Compound
Data provided under Section 3.2 or otherwise generated pursuant to the Research
Program; (vii) monitoring performance of the Research Program, including
comparing its progress to established goals and revising the Performance
Criteria as may be required or appropriate from time to time, including to
address removal of Proscribed Compounds or Proscribed Compounds pursuant to
Section 3.2.4 or 3.2.5; and (viii) carrying out other responsibilities or making
any other decisions as are expressly allocated to the JRC under this Agreement.

                  (b) The Parties, through the JRC, shall discuss and consider a
proposal to expand the Research Program to include [*] activities with respect
to AZ Compounds and CK Compounds. Such discussions shall commence no more than
[*] ([*]) months after the Effective Date. If such proposal is approved by the
Parties following the recommendation of the JRC, then the Research Plan and this
Agreement will be revised to reflect such expansion, which may include
modification of the Field to include [*]. If such expansion is not approved,
then the Parties, through the JRC, shall discuss and consider a proposal to
extend the licenses to AZ Compound Data and AZ Compounds to permit CK to conduct
[*] at its own expense outside the Research Program.

            2.4.4 DECISION MAKING. The JRC shall endeavor to reach consensus on
all matters brought before it. Decisions of the JRC must be made with
participation of at least two (2) representatives of each Party and by unanimous
vote of each participating representative. Decisions will be included in the
written minutes of a meeting, with such written minutes approved by all Persons
present at such a meeting of the JRC. In the event the JRC is unable to resolve
an outstanding matter, such matter shall be referred for resolution in good
faith by the Joint Steering Committee (JSC) as described in Section 2.5.

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      2.5 THE JOINT STEERING COMMITTEE. Promptly after the Effective Date, the
Parties shall establish a Joint Steering Committee (the "JSC") as set forth in
this Section 2.5. The JSC will exist throughout the term of this Agreement.

            2.5.1 MEMBERSHIP. The JSC shall be comprised of two (2)
representatives from each of AZ and CK. For AZ, the representatives are [*] and
[*]. For CK, the representatives are [*] and another individual to be selected
by CK by written notice to AZ. Each Party may replace its representatives on the
JSC at any time by providing written notice to the other Party. Replacements
must have comparable seniority, responsibility and knowledge or experience.

            2.5.2 MEETINGS. The JSC shall meet at least once annually during the
Research Term, and as necessary from time to time during the remainder of the
Term, including face-to-face meetings, telephone or video conference calls. The
location and other logistics of any meeting will be determined by the JSC. The
JSC shall create and agree on written minutes for each meeting of the JSC. Each
party shall bear the expenses of its JSC members related to such members'
participation on the JSC and attendance at JSC meetings.

            2.5.3 RESPONSIBILITIES. The JSC shall have responsibility to oversee
and review the Research Program and to arbitrate decision making as described
below.

            2.5.4 DECISION MAKING. Decisions of the JSC shall be made by
unanimous vote, with each Party having a single vote irrespective of the number
of representatives actually in attendance at a meeting. Decisions will be
included in the written minutes of a meeting, with such written minutes approved
by all persons present at such a meeting of the JSC. If the Parties are unable
to reach resolution within [*] ([*]) days following the date the matter in
dispute is first brought to the attention of the JSC, that matter shall be
resolved in accordance with Section 10.2.

      2.6 RESEARCH PLAN.

            2.6.1 INITIAL RESEARCH PLAN. The initial Research Plan, which covers
the Research Program during Contract Year One, is attached as EXHIBIT 1.45. The
Parties acknowledge and agree that such initial Research Plan sets forth the
goals and objectives of the Research Program and the broad terms of the Parties'
respective undertakings to achieve those goals and objectives. The Parties
further acknowledge and agree that the Research Plan will be supplemented and
otherwise amended by the JRC from time to time during the Research Term for each
stage of the Research Program to identify and define the specific undertakings
of the Parties required to implement the Research Program.

            2.6.2 NEW RESEARCH PLANS. At least three (3) months prior to the end
of each Contract Year during the Research Term, the JRC shall meet to establish
the Research Plan for the upcoming Contract Year. The JRC shall establish such
Research Plan no later than thirty (30) days prior to the end of the
then-current Contract Year.

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            2.6.3 REVISED RESEARCH PLANS. In addition to new Research Plans, the
JRC shall review each Research Plan on an ongoing basis and may make changes
thereto in accordance with the procedures in Section 2.4.4.

            2.6.4 REQUIREMENTS OF THE RESEARCH PLAN. Unless otherwise agreed by
each Party, the Research Plan must be consistent with the terms in Article III
and this Agreement generally.

      2.7 EXTENSION OF RESEARCH TERM. [*] ([*]) days prior to the expiration of
the initial Research Term, the JRC shall discuss the possibility of extending
the Research Program and correspondingly the Research Term. In such event, if
the Parties do not reach agreement on an extension of the Research Term prior to
the expiration of the initial Research Term, then the expiration date for the
initial Research Team will be extended for [*] ([*]) days, in order to continue
negotiation of the terms and conditions for an extension of the Research Term,
if any.

      2.8 INFORMATION AND REPORTS. During the Research Term, each Party shall
provide to the other, through the JRC, a written report summarizing the progress
of its activities and performance of the Research Program, and including data
and information pertaining to assays, protocols and procedures developed for use
with the Cytometrix(TM) Hepatotoxicity Module, and other information and
Technology as otherwise provided in the applicable Research Plan. Unless
otherwise agreed, such reports shall be due thirty (30) days after the end of
each calendar quarter and after the end of the Research Term. Upon the written
request of a Party, the other Party shall provide that requesting Party with raw
data generated by or on behalf of such other Party within the Collaboration
Technology and Collaboration Knowledge, to the extent not previously provided
hereunder. Without limiting the foregoing, each Party shall disclose to the
other Party, any and all Collaboration Technology and Collaboration Knowledge,
including any discoveries or inventions made by such Party in the scope of the
Research Program or pursuant to carrying out the Research Program, with
significant discoveries or advances being communicated as soon as practical
after such Collaboration Technology or Collaboration Knowledge is developed.

              ARTICLE III - CONTRIBUTIONS TO THE RESEARCH PROGRAM

      3.1 FTES. In its conduct of its activities under the Research Program and
unless otherwise mutually agreed in writing or determined by the JRC, each Party
shall assign the number of FTEs to the Research Program as follows: CK shall
commit [*] ([*]) FTEs during each Contract Year to perform activities under the
Research Program in accordance with the Research Plan then in effect, and AZ
shall commit [*] FTEs during the Research Term to perform activities under the
Research Program in accordance with the Research Plan then in effect. For
clarity, AZ has agreed to fund during each Contract Year of the Research Term
[*] ([*]) of the FTEs committed by CK, as described in Section 6.1.

      3.2 COMPOUNDS AND COMPOUND DATA.

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            3.2.1 AZ shall identify the AZ Compounds to be used in the Research
Program, and shall provide to CK the AZ Compounds in reasonable quantities, but
at least [*] for each AZ Compound. For each AZ Compound, AZ shall provide the
information, to the extent such information exists on the Effective Date,
contemplated by the version of EXHIBIT 1.4 attached to this Agreement as of the
Effective Date (which information, it is understood, may be different for
Proprietary and Public AZ Compounds). In addition to the information on EXHIBIT
1.4, for each AZ Compound, AZ shall provide compound purity and analytical and
quality control data and procedures, to the extent such information exists on
the Effective Date. AZ is not required to provide [*] for any Proprietary AZ
Compounds. During the Research Term, AZ may include additional Compounds as AZ
Compounds upon written notice to CK or by mutual written agreement of the
Parties. For each such AZ Compound, AZ shall provide the AZ Compound Data on
EXHIBIT 1.4 and the other AZ Compound Data required pursuant to this Section
3.2.1, to the extent such information exists at the time such AZ Compound is
added.

            3.2.2 CK shall identify the CK Compounds to be used in the Research
Program, and make available for use in the Research Program, the CK Compounds in
reasonable quantities, but at least [*] for each CK Compound. For each CK
Compound, CK shall provide the information, to the extent such information
exists on the Effective Date, contemplated by the version of EXHIBIT 1.11
attached to this Agreement as of the Effective Date (which information, it is
understood, may be different for Proprietary and Public CK Compounds). In
addition to the information on EXHIBIT 1.11, for each CK Compound, CK shall
provide compound purity and analytical and quality control data and procedures,
to the extent such information exists on the Effective Date. CK is not required
to provide [*] for any Proprietary CK Compounds. During the Research Term, CK
may include additional Compounds as CK Compounds upon written notice to AZ or by
mutual written agreement of the Parties. For each such CK Compound, CK shall
provide the CK Compound Data on EXHIBIT 1.11 and other CK Compound Data required
pursuant to this Section 3.2.2, to the extent such information exists at the
time such CK Compound is added.

            3.2.3 Each Party's rights with respect to the Compounds and Compound
Data delivered under this Agreement are as set forth in Section 5.3.

            3.2.4 AZ may remove any Proprietary AZ Compound from use in the
Research Program, upon written notice to CK, if that Proprietary AZ Compound
becomes or is named a Proscribed Compound. EXHIBIT 1.4 shall be amended
accordingly and such Compound no longer shall be an "AZ Compound" for purposes
of this Agreement. Upon CK's receipt of notice that a Compound is a Proscribed
Compound and is being removed as an AZ Compound, CK shall, in AZ's sole
discretion and at AZ's direction and expense, return or destroy those removed
Proscribed Compounds.

            3.2.5 CK may remove a Proprietary CK Compound from use in the
Research Program, upon written notice to AZ, if that Proprietary CK Compound
becomes or is named a Proscribed Compound. EXHIBIT 1.11 shall be amended
accordingly and such Compounds no longer shall be "CK Compounds" for purposes of
this Agreement. Upon AZ's receipt of notice that a Compound is a Proscribed
Compound and is being removed as a CK Compound, AZ shall,

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in CK's sole discretion and at CK's direction and expense, return or destroy
those removed Proscribed Compounds.

            3.2.6 For clarity, nothing herein shall be deemed to create an
obligation on behalf of either Party to provide the other Party with Compounds
after the expiration of the Research Term, except that on an ongoing basis after
termination or expiration of the Research Term, AZ shall provide Proprietary AZ
Compounds to CK in specific amounts under the conditions described in this
Section 3.2.6 for the purpose of enabling CK to [*]. AZ shall provide
Proprietary AZ Compounds on the limited basis described herein in accordance
with the restrictions set forth in Section 3.2.7, Section 5.3 and other
reasonable and customary terms, provided the amount of payment for those
Proprietary AZ Compounds shall not exceed AZ's documented direct and reasonably
allocable indirect costs in obtaining such Compounds for any reason.

            3.2.7 AZ's obligations under Section 3.2.6 shall extend for no
longer than five (5) years after the date of expiration or termination of the
Research Term, but shall cease immediately upon termination of this Agreement
under Section 8.2.1 for CK's material breach or upon termination of this
Agreement under Section 8.2.3 for lack of feasibility.

            3.2.8 AZ represents and warrants that no AZ Compound on EXHIBIT 1.4
is, as of the Effective Date, a Proscribed Compound. CK represents and warrants
that no CK Compound on EXHIBIT 1.11 is, as of the Effective Date, a Proscribed
Compound.

      3.3 DELIVERABLES. CK shall deliver or otherwise make available to AZ the
Deliverables, as defined in EXHIBIT 1.23. The timing, form and manner of
delivery are set forth on the Research Plan, including which of the software
components of the Cytometrix(TM) Hepatotoxicity Module or other Deliverables
will be delivered in source code form and which in object code form. The
Research Plan also sets forth the infrastructure and instrumentation required
for use of the Cytometrix(TM) Hepatotoxicity Module, and objectives for
development, delivery and functionality of the Cytometrix(TM) Hepatotoxicity
Module, including parameters for expandability and flexibility.

      3.4 EVALUATION OF CYTOMETRIX(TM) HEPATOTOXICITY MODULE. After the
prototype Cytometrix(TM) Hepatotoxicity Module is installed at the CK Facility
and used in connection with CK's infrastructure and instrumentation, and then
again after the Cytometrix(TM) Hepatotoxicity Module is installed at the AZ
Facility and used in connection with AZ's infrastructure and instrumentation,
the Parties jointly shall perform mutually agreed testing and other evaluation
procedures to determine whether the Cytometrix(TM) Hepatotoxicity Module meets
the Performance Criteria. If the Parties disagree as to whether the Performance
Criteria have been met, then the Parties shall cooperate to resolve any
disagreement. Where resolution is within the scope of the then-existing Research
Plan, the Parties shall cooperate to resolve the disagreement first under
Section 2.4 through the JRC, then under Section 2.5 through the JSC, and then
pursuant to Section 10.2. Where resolution is outside the scope of the
then-existing Research Plan, the Parties shall cooperate to resolve the
disagreement under Section 2.5 through the JSC, and then pursuant to Section
10.2.

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AZ AND CK CONFIDENTIAL

      3.5 TECHNOLOGY AND DELIVERY. AZ shall use diligent efforts to make
available for disclosure and delivery to CK, and CK shall use diligent efforts
to make available for disclosure and delivery to AZ, any and all Technology that
is (a) Controlled by the disclosing Party, (b) known to the disclosing Party's
personnel responsible for the Research Program or to individuals that report to
such personnel, and (c) is either reasonably required or known to be useful to
undertaking the activities under the Research Program or performing the
obligations required and activities contemplated under this Agreement, whether
such Technology arises out of Exempt Activities or otherwise (such Technology,
"RELEVANT TECHNOLOGY"). Relevant Technology includes AZ Knowledge, CK Knowledge,
AZ Background Technology and CK Background Technology. Notwithstanding the
foregoing, Relevant Technology shall exclude a Party's Technology to the extent
that disclosure of that Technology would materially compromise an ongoing drug
discovery or development program conducted by or on behalf of that Party.
Relevant Technology shall be disclosed in accordance with this Section 3.5
below. Such disclosure shall occur within [*] ([*]) months from the time the
disclosing Party's personnel responsible for the Research Program or individuals
that report to such personnel become aware of such Relevant Technology.

            3.5.1 If a disclosing Party deems Relevant Technology to be AZ
Background Technology or CK Background Technology, as applicable, then prior to
disclosing that Relevant Technology to the other Party hereunder, the disclosing
Party shall provide to the JRC a summary of that Relevant Technology, in
sufficient detail to determine whether that Relevant Technology is AZ Background
Technology or CK Background Technology, as applicable. The JRC will confirm that
such Relevant Technology is AZ Background Technology or CK Background
Technology; provided that it is not required to do so to the extent the Relevant
Technology consists of General Methods; and provided further and notwithstanding
the foregoing that the JRC is required to agree that Relevant Technology is AZ
Background Technology or CK Background Technology to the extent it consists of a
type of Technology already similar to that within CK Background Technology or AZ
Background Technology.

            3.5.2 If the JRC confirms that Relevant Technology is AZ Background
Technology or CK Background Technology, as applicable, then the Party to receive
such Technology hereunder shall promptly notify the disclosing Party, within [*]
([*]) business days after confirmation by the JRC, if it does not wish to
receive such Relevant Technology; and provided further that AZ may not decline
to receive Relevant Technology to the extent that Relevant Technology is
reasonably necessary for the CHM to meet the Performance Criteria. The Parties
may agree that certain Technology should be disclosed in a different form or
manner (e.g., in object code rather than in source code), as appropriate.
Exhibit 1.3 or Exhibit 1.10, as applicable, shall be amended to include such
additional AZ Background Technology or CK Background Technology.

            3.5.3 If the JRC does not confirm such Relevant Technology as AZ
Background Technology or CK Background Technology and the receiving Party has
declined to receive such Relevant Technology, then the disclosing Party has no
obligation to disclose such Relevant Technology, and if the disclosing Party, at
its option, discloses such Technology, then it will be deemed AZ Knowledge or CK
Knowledge, as appropriate.

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                      ARTICLE IV - EXCLUSIVITY OF EFFORTS

      4.1 EXCLUSIVITY OF EFFORTS. Except for the Exempt Activities, during [*],
neither AZ nor CK shall collaborate or otherwise cooperate with any Third Party
to, and neither AZ nor CK shall, perform research or development specifically
directed to the Field, other than under the Research Program. For the avoidance
of doubt, during [*], nothing herein shall restrict either Party in any way from
[*] which could have application in or out of the Field so long as such [*] are
not used in the Field. It is understood that even if the foregoing exclusivity
provision terminates or expires, each Party shall continue diligently to
endeavor to fulfill all of its obligations hereunder during the remainder of the
term of the Agreement, including those obligations directed at enabling the
Cytometrix(TM) Hepatotoxicity Module to meet the Performance Criteria.

      4.2 PERMITTED ACTIVITIES. Nothing herein shall be deemed to prevent or
restrict AZ's or CK's rights to undertake and perform the Exempt Activities and
CK's right to develop and commercialize the CM System for any and all
applications outside of the Field. Likewise, nothing herein shall be deemed to
prevent or restrict either Party's right to develop or commercialize methods of
or systems for in vitro prediction of hepatotoxicity when those methods or
systems are outside of the Field; provided that the Party is complying with its
obligations hereunder with respect to Confidential Information and Intellectual
Property Rights of the other Party.

                    ARTICLE V - OWNERSHIP AND LICENSE GRANTS

      5.1 OWNERSHIP.

            5.1.1 AZ OWNERSHIP. AZ owns and shall own all right, title and
interest in and to the AZ Background Technology, AZ Compounds, AZ Compound Data,
AZ Knowledge and all Intellectual Property Rights therein. As between the
Parties, AZ has the exclusive right, at its sole discretion and expense, to
apply for, register, maintain and enforce Patents and other Intellectual
Property Rights as it deems appropriate with respect to any of the AZ Background
Technology, AZ Compounds, AZ Compound Data and AZ Knowledge.

            5.1.2 CK OWNERSHIP. CK owns and shall own all right, title and
interest in and to the CM System, CK Compounds, CK Compound Data, CK Background
Technology, CK Knowledge and all Intellectual Property Rights therein. Further,
CK owns and shall own all right, title and interest in and to the Collaboration
Technology and Collaboration Knowledge, and in and to the Cytometrix(TM)
Hepatotoxicity Module, and all Intellectual Property Rights therein.
Accordingly, AZ hereby assigns to CK any and all right, title and interest in
and to the Collaboration Technology, Collaboration Knowledge, and the
Cytometrix(TM) Hepatotoxicity Module, together in each case with all
Intellectual Property Rights therein that AZ may acquire as a result of its
performance of the Research Program or activities under the Pilot License (1)
except that AZ shall not assign those Improvements (and the Intellectual
Property Rights therein) owned by AZ pursuant to Section 5.1.3, and (2) the
foregoing assignment is subject to the licenses granted by CK to AZ under
Sections 5.4.2, 5.4.3, 5.5, 5.6 and 5.7. As between the

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AZ AND CK CONFIDENTIAL

Parties, CK has the exclusive right, at its sole expense, to apply for,
register, maintain and enforce Patents and other Intellectual Property Rights as
it deems appropriate with respect to any of the CK Background Technology, CK
Knowledge, CK Compounds, CK Compound Data, Cytometrix(TM) Hepatotoxicity Module,
Collaboration Technology, Collaboration Knowledge and Improvements owned by CK
under Section 5.1.3. AZ agrees to execute documents, render such reasonable
assistance, and take such other reasonable action at CK's expense as CK may
reasonably request to apply for, register, perfect, confirm, and protect the
rights it assigns to CK under this Section 5.1.2.

            5.1.3 IMPROVEMENTS. Without limiting Section 5.1.2, (i) all AZ
Improvements are owned by AZ (subject to the licenses granted to CK under
Section 5.1.4), and (ii) all other Improvements to the Cytometrix(TM)
Hepatotoxicity Module arising during the Pilot License Term, whether created
jointly or solely by one of the Parties, are owned by CK. Accordingly, AZ hereby
assigns to CK any and all right, title and interest in and to any Improvements
owned by CK pursuant to this Section 5.1.3. AZ agrees to execute documents,
render such reasonable assistance, and take such other reasonable action at CK's
expense as CK may reasonably request to apply for, registered, perfect, confirm
and protect the rights it assigns to CK under this Section 5.1.3. After the end
of the Pilot License Term, Improvements to the Cytometrix(TM) Hepatotoxicity
Module made by CK shall be owned by CK and Improvements to the Cytometrix(TM)
Hepatotoxicity Module made by AZ shall be owned by AZ. For avoidance of doubt,
neither Party has any right, license or access to Improvements made by the other
Party after the end of the Pilot License Term.

            5.1.4 LICENSE TO AZ IMPROVEMENTS. AZ agrees to grant and hereby
grants CK a worldwide, perpetual, irrevocable, non-exclusive right and license,
including the right to grant and authorize sublicenses, under AZ Intellectual
Property Rights in AZ Improvements.

      5.2 LICENSES TO BACKGROUND TECHNOLOGY.

            5.2.1 AZ GRANT TO CK. AZ agrees to grant and hereby grants CK a
non-exclusive, worldwide, royalty-free right and license, under AZ Intellectual
Property Rights in AZ Background Technology, to use AZ Background Technology
solely for the purposes of CK performing the Research Program during the
Research Term. Upon completion of the Research Program and CK delivering to AZ
the items required to be provided under the Research Plan, and upon the
Cytometrix(TM) Hepatotoxicity Module, as installed at the CK Facility, meeting
the Performance Criteria, AZ agrees to grant and hereby grants to CK a
non-exclusive, worldwide, royalty-free, perpetual right and license, limited to
the Field, under AZ Intellectual Property Rights in AZ Background Technology,
for CK to practice AZ Background Technology in the production, use and
modification of the Cytometrix(TM) Hepatotoxicity Module and Improvements
thereof. For [*] ([*]) years following the expiration of the Research Term, CK's
license under this Section 5.2.1 shall be restricted solely for internal
research purposes, which internal research purposes include CK's use of the
Cytometrix(TM) Hepatotoxicity Module in its research collaborations with any
collaborator when required to advance the research collaboration or CK's
internal drug discovery and development programs; provided that the
Cytometrix(TM) Hepatotoxicity Module is not the predominant component of the

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AZ AND CK CONFIDENTIAL

relationship between CK and such collaborator and provided further that in any
research collaboration the Cytometrix(TM) Hepatotoxicity Module is used for
activities such as to inform lead generation or to triage hits and leads rather
than solely for activities such as screening entire libraries of compounds. For
the avoidance of doubt however, such internal research use shall expressly
exclude exploitation of the Cytometrix(TM) Hepatotoxicity Module as a commercial
product or service (e.g., as a service bureau), except as expressly provided
above. In connection with such internal research purposes, CK may authorize
collaborators and others to access and use of the AZ Background Technology at
CK's facility. After the first [*] ([*]) years after the Research Term, CK is
free to sublicense its rights under this Section 5.2.1 without restriction.

            5.2.2 CK GRANT TO AZ. CK agrees to grant and hereby grants AZ a
non-exclusive, worldwide, royalty-free right and license, outside the Prohibited
Field and limited to the Field, under CK Intellectual Property Rights in CK
Background Technology, to use CK Background Technology solely for the purposes
of AZ performing the Research Program during the Research Term. To the extent
that CK Background Technology is software and is delivered to AZ in object code
form, AZ shall not reverse engineer or otherwise attempt to derive source code
from that software.

      5.3 LICENSES TO COMPOUNDS AND COMPOUND DATA.

            5.3.1 AZ GRANT TO CK.

                  (a) AZ agrees to grant and hereby grants CK a non-exclusive,
worldwide, royalty-free license under AZ Intellectual Property Rights in AZ
Compounds and AZ Compound Data in the Field (a) during the Research Term, solely
in connection with CK's performance of the Research Program and in accordance
with the Research Plan, (b) during and after the Research Term, to perform
purity analysis, and (c) after the Research Term (1) for CK to [*] thereof, and
(2) as expressly provided in Section 7.3. CK agrees that although it may perform
purity analysis as set forth above, neither it nor any of its employees, agents
or assigns shall attempt to determine the chemical structure of, or otherwise
characterize, the AZ Compounds proprietary to AZ without the prior written
consent of AZ. For [*] ([*]) years following the expiration of the Research
Term, CK's license under this Section 5.3.1 shall be restricted solely for
internal research purposes. For purposes of this Agreement, internal research
purposes include CK's use of the Cytometrix(TM) Hepatotoxicity Module in its
research collaborations with any collaborator when required to advance the
research collaboration or CK's internal drug discovery and development programs;
provided that the Cytometrix(TM) Hepatotoxicity Module is not the predominant
component of the relationship between CK and such collaborator and provided
further that in any research collaboration the Cytometrix(TM) Hepatotoxicity
Module is used for activities such as to inform lead generation or to triage
hits and leads rather than solely for activities such as screening entire
libraries of compounds. For the avoidance of doubt however, such internal
research use shall expressly exclude exploitation of the Cytometrix(TM)
Hepatotoxicity Module as a commercial product or service (e.g., as a service
bureau), except as expressly provided above. In connection with such internal
research purposes, CK may authorize collaborators and others to access and use
of the AZ Compounds and Compound Data

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AZ AND CK CONFIDENTIAL

at CK's facility. After the first [*] ([*]) years after the Research Term, CK is
free to sublicense its rights to the AZ Compound Data for the purpose of [*]
thereof under this Section 5.3.1(a).

                  (b) CK shall maintain written records regarding the use of AZ
Compounds and AZ Compound Data, and upon reasonable advance written notice and
during regular business hours, CK shall permit AZ or its authorized designee to
access CK Facilities, and to review required documentation to determine
compliance with the terms of this license.

            5.3.2 CK GRANT TO AZ. CK agrees to grant and hereby grants AZ a
non-exclusive, worldwide, royalty-free license, but excluding all activities in
the Prohibited Field, under CK Intellectual Property Rights in CK Compounds and
CK Compound Data in the Field (a) during the Research Term, solely in connection
with AZ's performance of the Research Program and in accordance with the
Research Plan, (b) during and after the Research Term, to perform purity
analysis, and (c) after the Research Term (1) for AZ to [*] thereof, and (2) as
expressly provided in Section 7.3. AZ agrees that although it may perform purity
analysis as set forth above, neither it nor any of its employees, agents or
assigns shall attempt to determine the chemical structure of, or otherwise
characterize, the CK Compounds proprietary to CK without the prior written
consent of CK.

            5.3.3 PUBLIC COMPOUNDS AND PUBLIC COMPOUND DATA. The Parties
acknowledge that, with respect to any CK Compound or AZ Compound that is
designated as Public on EXHIBIT 1.11 or EXHIBIT 1.4 (as applicable) (together
with corresponding CK Compound Data or AZ Compound Data), nothing in this
Agreement will be construed to restrict either Party in any manner from using,
disclosing, reproducing, or obtaining from other sources such Compounds or such
data and information.

      5.4 KNOWLEDGE LICENSES.

            5.4.1 AZ KNOWLEDGE. AZ grants CK an automatic, worldwide,
non-exclusive, royalty-free, perpetual and irrevocable license to use, reproduce
and otherwise exploit AZ Knowledge. The license granted in this Section 5.4.1
includes the right to disclose such AZ Knowledge to, and authorize further
disclosure and use by, Third Parties in connection with ongoing discovery,
development, collaboration and marketing or other activities. Disclosure to
Third Parties must be under appropriate terms and conditions including
restrictions equivalent to any in this Section 5.4.1 and, to the extent any AZ
Knowledge also is AZ's Confidential Information, confidentiality provisions
substantially equivalent to those in this Agreement.

            5.4.2 CK KNOWLEDGE. CK grants AZ an automatic, worldwide,
non-exclusive, royalty-free, perpetual and irrevocable license, to use,
reproduce and otherwise exploit CK Knowledge, solely for applications outside
the Prohibited Field. The license granted in this Section 5.4.2 includes the
right to disclose such CK Knowledge to, and authorize further disclosure use by,
Third Parties in connection with ongoing discovery, development, collaboration
and marketing or other activities. Disclosure to Third Parties must be under
appropriate terms and conditions including restrictions equivalent to any in
this Section 5.4.2 and, to the extent any CK Knowledge also is CK's Confidential
Information, confidentiality provisions substantially equivalent to those in
this Agreement.

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AZ AND CK CONFIDENTIAL

            5.4.3 COLLABORATION KNOWLEDGE. During and after the Research Term,
CK grants AZ an automatic, worldwide, non-exclusive, royalty-free, perpetual and
irrevocable license, to use, reproduce and otherwise exploit Collaboration
Knowledge, solely for applications outside the Prohibited Field. The license
granted in this Section 5.4.3 includes the right to disclose such Collaboration
Knowledge to, and authorize further disclosure use by, Third Parties in
connection with ongoing discovery, development, collaboration and marketing or
other activities by or on behalf of AZ. Disclosure to Third Parties of
Collaboration Knowledge licensed under this Section must be under appropriate
terms and conditions including restrictions equivalent to any in this Section
5.4.3 and, to the extent any such Collaboration Knowledge also is CK's
Confidential Information, confidentiality provisions substantially equivalent to
those in this Agreement.

      5.5 COLLABORATION TECHNOLOGY LICENSES.

            5.5.1 CYTOMETRIX(TM) HEPATOTOXICITY MODULE MEETS PERFORMANCE
CRITERIA. Upon the Cytometrix(TM) Hepatotoxicity Module meeting the Performance
Criteria at the AZ Facility (as determined pursuant to Section 3.4), CK agrees
to grant and hereby grants to AZ a worldwide, perpetual, non-transferable
(except in accordance with Section 10.4), non-exclusive right and license,
outside the Prohibited Field, under CK Intellectual Property Rights in
Collaboration Technology. The rights granted in this Section 5.5.1 do not extend
to the use, development or exploitation of Collaboration Technology in the
Field, which restriction is for a period not to exceed [*] ([*]) years following
the Pilot License Term (subject to earlier termination of the foregoing
restriction pursuant to Section 8.3.2(b) for termination of the Agreement under
Section 8.2.1).

            5.5.2 OPTION FOR LICENSES WHEN CYTOMETRIX(TM) HEPATOTOXICITY MODULE
FAILS TO MEET PERFORMANCE CRITERIA OR AGREEMENT IS TERMINATED PURSUANT TO
SECTION 8.2.3. If either (1) the Parties determine that the Cytometrix(TM)
Hepatotoxicity Module has not met the Performance Criteria (as determined
pursuant to Section 3.4) or (2) this Agreement is terminated prior to the end of
the Pilot License Term pursuant to Section 8.2.3 (Lack of Feasibility), then AZ
may, at its option, obtain a license to Collaboration Technology as set forth in
this Section 5.5.2. Upon the occurrence of either of the conditions outlined
above, AZ may provide notice to CK of its desire to obtain such a license, and
the Parties will negotiate in good faith an amount to be paid for the license,
but not to exceed US$[*]. Upon payment of such amount, CK agrees to grant and
hereby grants to AZ a worldwide, perpetual, non-exclusive, non-transferable
(except in accordance with Section 10.4), irrevocable right and license under CK
Intellectual Property Rights in Collaboration Technology, solely for
applications outside the Prohibited Field.

      5.6 PILOT LICENSE AND SUPPORT.

            5.6.1 PILOT LICENSE. Upon the Cytometrix(TM) Hepatotoxicity Module
meeting the Performance Criteria at the CK Facility, CK agrees to grant and
hereby grants AZ, during the Pilot License Term, a worldwide, non-exclusive,
non-transferable (except in accordance with Section 10.4), royalty-free right
and license in the Field (but excluding all activities or applications in the
Prohibited Field), under CK Intellectual Property Rights in CK Knowledge,

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AZ AND CK CONFIDENTIAL

CK Background Technology and Collaboration Technology, to use the Cytometrix(TM)
Hepatotoxicity Module, together with any Improvements owned by CK, solely for
its own internal research at the AZ Facility (the "PILOT LICENSE"). To the
extent that a software component of the Cytometrix(TM) Hepatotoxicity Module is
delivered in object code form, the license granted extends only to the object
code form and not the source code form of that software, and AZ shall not, and
shall not permit any Third Party to, reverse engineer or decompile, or otherwise
attempt to derive source code from that software component. To the extent that a
software component of the prototype version of the Cytometrix(TM) Hepatotoxicity
Module is delivered in source code form, AZ shall not modify that software
component and the use and disclosure thereof is subject to the requirements of
Section 7.1; however, it is understood that AZ may compile such source code to
create the object code derivative thereof.

            5.6.2 SUPPORT. CK shall provide technical support as set forth on
EXHIBIT 5.6.2 with respect to the Cytometrix(TM) Hepatotoxicity Module. For
clarity, CK has no support obligations other than as expressly set forth on that
EXHIBIT 5.6.2.

      5.7 AZ FULL LICENSE TO CYTOMETRIX(TM) HEPATOTOXICITY MODULE.

            5.7.1 LICENSES. Upon the Cytometrix(TM) Hepatotoxicity Module
meeting the Performance Criteria at the AZ Facility, and upon payment by AZ of
the Milestone Payment under Section 6.2 and the Annual License Renewal Fees
thereafter, CK agrees to grant and hereby grants AZ, during the Full License
Term, a worldwide, non-exclusive, non-transferable (except in accordance with
Section 10.4), royalty-free right and license in the Field (but excluding all
activities or applications in the Prohibited Field), under CK Intellectual
Property Rights in CK Knowledge, CK Background Technology and Collaboration
Technology, (i) to use the Cytometrix(TM) Hepatotoxicity Module, and any
Improvements (to the extent such Improvements are in the Field, owned by CK, and
in existence as of the first day of the Full License Term), for its own internal
research and development program at any and all AZ Facilities, (ii) to make and
distribute a reasonable number of copies of the Cytometrix(TM) Hepatotoxicity
Module, including a reasonable number of backup copies thereof in connection
with the exercise of the rights set forth in clause (i) above, and (iii) to
create derivative works of the Cytometrix(TM) Hepatotoxicity Module only for the
purpose of maintaining and supporting AZ's authorized use thereof and to the
extent those derivative works are within the scope of the Deliverables described
in EXHIBIT 1.23 and of the following activities: refining the model by including
extra compounds, modifying existing assays, and incorporating additional assays
(the foregoing licenses in clauses (i) through (iii) above together are the
"FULL LICENSE"). To the extent that a software component of the Cytometrix(TM)
Hepatotoxicity Module is delivered in object code form, the license granted
extends only to the object code form and not the source code form of that
software, and AZ shall not, or permit any Third Party to, reverse engineer or
decompile, or otherwise attempt to derive source code from that software
component.

            5.7.2 RECORDS. AZ shall maintain records regarding the use of the
Cytometrix(TM) Hepatotoxicity Module, and upon reasonable advance written notice
and during regular business hours, AZ shall permit CK or its authorized designee
to access AZ Facilities, and to review required documentation to determine
compliance with the terms of this license.

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AZ AND CK CONFIDENTIAL

      5.8 NO IMPLIED LICENSES. Each Party acknowledges that the rights and
licenses granted under this Article V are limited to the scope expressly granted
herein, and all rights not so granted are hereby expressly reserved. Nothing in
this Agreement shall limit in any respect the right of either Party to use its
own Technology to conduct research and development with respect to and
commercialize products or technologies outside the Field. Consistent with the
foregoing, it is understood that licenses to Collaboration Technology and
licenses to Collaboration Knowledge do not include or incorporate any right or
license to CK Background Technology; exploitation of Collaboration Technology or
Collaboration Knowledge may require a license to the underlying subject matter.
It is further understood that licenses to Collaboration Technology and licenses
to Collaboration Knowledge do not extend to the Cytometrix(TM) Hepatotoxicity
Module; exploitation of Collaboration Technology or Collaboration Knowledge that
is not independent of the Cytometrix(TM) Hepatotoxicity Module may require a
separate license to such Cytometrix(TM) Hepatotoxicity Module for use thereof.

                             ARTICLE VI - PAYMENTS

      6.1 RESEARCH PROGRAM FUNDING.

            6.1.1 FTE FUNDING. Each Party shall assume responsibility for its
own costs and expenses for its conduct of activities under the Research Program
with the sole exception that AZ shall fund, quarterly in advance, during the
Research Term (whether or not the Pilot License Term has begun), [*] ([*]) of
the [*] ([*]) FTEs to be committed by CK for the performance of the Research
Program, at the FTE rate set forth below. In total, subject to any Additional
Items, the annual FTE funding to be provided by AZ to CK under this Section
6.1.1 shall not exceed US$[*], unless otherwise separately agreed by the Parties
in writing.

            6.1.2 The FTE rate is [*] dollars (US$[*]) per year, which includes
all employee-related compensation, including salaries, wages, bonuses, benefits,
profit sharing, stock option grants, and FICA costs, travel, meals and
entertainment (except in connection with reimbursed travel described below),
training, recruiting, relocation, operating supplies, postage, communications
expense, professional dues, depreciation, repairs and maintenance, rent and
lease, utilities, taxes, facilities and space costs, and computer service
charges. The FTE rate excludes the cost of items identified as Additional Items
as described in Section 6.1.2. AZ shall have no obligation to fund FTEs after
the Research Term. During the Pilot License Term, the direct out-of-pocket
expenses of travel and lodging incurred by CK personnel while required to be on
site pursuant to the Research Program will be reimbursed by AZ to CK; provided
that the CK employees are away from the facility at which those personnel
typically work and the duration of the trip is for an extended period of time
(i.e., more than three (3) working days). AZ shall reimburse CK for such direct
out-of-pocket expenses incurred by CK that are within the AZ travel guidelines
within sixty (60) days after receipt by AZ of a correct invoice with supporting
documentation from CK that identifies the name of the employee, the date of the
trip(s) taken and the total dollar amount incurred with sufficient detail to
determine amounts incurred for transportation, meals, lodging, and related
incidentals.

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AZ AND CK CONFIDENTIAL

            6.1.3 ADDITIONAL EXPENSES. From time to time, the JRC may identify
additional items or subject matter required to carry out the Research Program,
including additional licenses under Intellectual Property Rights of Third
Parties, extraordinary equipment or specialized reagents or any other external
costs (each such item an "ADDITIONAL ITEM"). In each instance, the JRC will
apportion the cost of Additional Items according to the following principles:
(i) if the Additional Item will be consumed fully during the Research Term and
will be used only for work in the Field, the expense will be borne equally by CK
and AZ; (ii) if the Additional Item will not be fully consumed during the
Research Term, or will be used during the Research Term outside the Field by
either CK or AZ, the expense will be apportioned between CK and AZ in a manner
that equitably reflects the relative value to the Research Program of such
Additional Item and for applications outside of the Research Program for the
Party(ies) that will have rights thereto. For clarity, neither Party shall have
any obligation to reimburse the other Party with respect to amounts incurred by
the other Party with respect to any Additional Item, except as agreed by the
JRC. Unless otherwise mutually agreed, during the Research Program, CK shall be
the contracting Party with respect to any such Additional Items and shall
directly pay for any such Additional Items. If there are cost apportionment
concerns regarding Additional Items during the Pilot Program, responsibility for
such costs shall be resolved by the JRC. All equipment acquired during the Pilot
Phase at the AZ facility shall become the property of AZ.

      6.2 MILESTONE PAYMENT. Upon completion of the Research Program, after CK
has delivered to AZ the items required to be provided under the Research Plan,
and upon the Cytometrix(TM) Hepatotoxicity Module, as installed at the AZ
Facility, meeting the Performance Criteria (as determined pursuant to Section
3.4), a milestone payment of [*] USD dollars (US$[*]) ("MILESTONE PAYMENT") will
become due and payable. AZ shall pay the Milestone Payment within thirty (30)
days following receipt of an invoice from CK, generated in accordance with the
foregoing.

      6.3 LICENSE RENEWAL FEES.

            6.3.1 On each of the first [*] ([*]) annual year anniversaries of
the date on which the Full License is first effective, AZ shall pay to CK an
annual license renewal fee of [*] dollars (US$[*]) ("ANNUAL LICENSE RENEWAL
FEE") for continuance of the Full License, within thirty (30) days after CK's
invoice. On each of the [*] ([*]) through [*] ([*]) annual year anniversaries of
the date on which the Full License is first effective, AZ has the option to (i)
pay to CK the annual license renewal fee of [*] dollars (US$[*]) for continuance
of the Full License, within thirty (30) days after CK's invoice or the end of a
Contract Year, or (ii) cease payments and terminate the Full License. Upon
either (i) a CK Change of Control event that arises due to CK's merger with,
acquisition by, or other similar transaction with a pharmaceutical company with
annual sales in excess of US$1 billion that occurs at any time during the Full
License, or (ii) payment of the [*] ([*]) such annual license renewal fee in
accordance with this Agreement, the Full License granted to AZ pursuant to
Section 5.7 shall become fully paid up and perpetual.

            6.3.2 To the extent CK licenses the use of the Cytometrix(TM)
Hepatotoxicity Module to any Third Party for an amount that is less than the
amount owed by AZ under Section

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AZ AND CK CONFIDENTIAL

6.3.1, AZ's obligation to pay to CK an Annual License Renewal Fee of US$[*]
shall be reduced to the equivalent or less than the lowest amount that such
Third Party is obligated to pay.

      6.4 TAXES. CK will be responsible for paying any and all taxes and
assessments relating to any income or other consideration that CK derives from
this Agreement. All payments made by AZ to CK under this Agreement shall be made
without any deduction or withholding for or on account of any taxes. Withholding
taxes, if any, must be paid by AZ to the relevant taxing authority on behalf of
CK.

      6.5 TOTAL OBLIGATION. The Annual License Renewal Fees and the Milestone
Payment payable by AZ to CK pursuant to this Agreement, taken together with the
funding to be provided by AZ to CK and other amounts payable pursuant to this
Article 6, represent all of AZ's financial obligations to CK hereunder. CK shall
not be entitled to any additional compensation or remuneration from AZ under
this Agreement. The foregoing will not be construed as a limit on fees due for
termination, damages for breach, or obligations of indemnity.

                         ARTICLE VII - CONFIDENTIALITY

      7.1 CONFIDENTIAL INFORMATION. Except to the extent expressly authorized by
this Agreement or otherwise agreed in writing, the Parties agree that, for ten
(10) years after the expiration of the Research Term, the receiving Party shall
keep confidential and shall not publish or otherwise disclose or use for any
purpose other than as provided for in this Agreement any Confidential
Information of the other Party. "CONFIDENTIAL INFORMATION" means (i) any
prototypes provided by CK under this Agreement or in connection with the
Research Program; (ii) information disclosed in tangible form that is marked
"confidential" or with other similar designation to indicate its confidential or
proprietary nature; and (iii) information disclosed orally, where such
information is either (A) of the type usually considered confidential or
proprietary in the biopharmaceutical industry or (B) otherwise indicated to be
confidential or proprietary by the disclosing Party at the time of the initial
disclosure thereof and confirmed in writing as confidential or proprietary by
the disclosing Party within thirty (30) days after such disclosure.
Notwithstanding the foregoing, Confidential Information shall not include
information that, in each case as demonstrated by written documentation:

                  (a) was already or becomes lawfully known to the receiving
Party, other than under an obligation of confidentiality, at the time of
disclosure;

                  (b) can be demonstrated by documentation or other competent
proof to have been in the receiving Party's or its Affiliates' possession prior
to disclosure by the disclosing Party;

                  (c) is subsequently received by the receiving Party or its
Affiliates from a Third Party who is not bound by any obligation of
confidentiality with respect to that information;

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AZ AND CK CONFIDENTIAL

                  (d) is generally made available to Third Parties by the
disclosing Party without restriction on disclosure;

                  (e) was generally available to the public or otherwise part of
the public domain at the time of its disclosure to the receiving Party or became
generally available to the public or otherwise part of the public domain after
its disclosure and other than through any act or omission of the receiving Party
in breach of this Agreement; or

                  (f) was developed by the receiving Party without reference to
any information or materials disclosed or provided by the disclosing Party.

      7.2 PERMITTED DISCLOSURES. Notwithstanding Section 7.1 above, each Party
may disclose Confidential Information of the other Party as follows:

                  (a) to Third Parties (and to Affiliates) under appropriate
terms and conditions including confidentiality provisions substantially
equivalent to those in this Agreement in connection with obtaining financing and
other business activities, such Confidential Information permitted under this
subsection to be disclosed shall be limited to general descriptions of the
activities, technology and findings under this Agreement (including
associations), and shall exclude hepatotoxicity profiles, other than
toxicophoric centers, associated with chemotypes;

                  (b) as is reasonably necessary to exercise the rights and
licenses granted or reserved herein (including the right to grant sublicenses);

                  (c) to the extent such disclosure is reasonably necessary in
filing for, registering or maintaining Intellectual Property Rights in
accordance with Section 5.1;

                  (d) as required by law or regulation (including applicable
securities regulations); provided, however, that if a Party is required by law
or regulation to make any such disclosure of the other Party's Confidential
Information it will, except where impracticable for necessary disclosures, give
reasonable advance notice to the other Party of such disclosure requirement will
use its reasonable efforts to secure confidential treatment of such Confidential
Information required to be disclosed; or

                  (e) to the extent mutually agreed to by the Parties.

      7.3 RESTRICTIONS ON DISCLOSURE OF DATA SETS. Notwithstanding anything to
the contrary in this Agreement, AZ agrees that it shall treat as CK's
Confidential Information data sets generated by AZ using the CK Compounds.
Likewise, CK agrees that it shall treat as AZ's Confidential Information data
sets generated by CK using the AZ Compounds. However, CK may disclose those data
sets to CK collaborator(s) under appropriate obligations of confidentiality no
less protective than those for CK's own information. In addition, either Party
may use and disclose such data sets without restriction (a) as aggregated
information and data sets, whether about the proprietary or public AZ Compounds
or CK Compounds, as applicable for purposes of describing the utility of the
Cytometrix(TM) Hepatotoxicity Module and the general

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nature of the activities under this Agreement; and (b) individual data sets
about public AZ Compounds or CK Compounds, as applicable, in each case so long
as that Party does not disclose specific [*], other than [*], that could be
associated with specific [*].

      7.4 PRESS RELEASE; CONFIDENTIALITY OF TERMS OF AGREEMENT. Neither Party
shall disclose to any Third Party the terms of this Agreement without the prior
written consent of the other Party, except (a) to advisors and existing and
potential investors on a need to know basis under circumstances that reasonably
ensure the confidentiality thereof, (b) to Third Parties to the extent necessary
to comply with the terms of licenses from Third Parties with respect to a
Party's Confidential Information, (c) to the extent required by law or a court
or other governmental body; provided that in such situation the Party wishing to
disclose the terms gives reasonable advance written notice to the non-disclosing
Party of the proposed disclosure and the reason for such disclosure and uses
reasonable efforts to secure confidential treatment of such disclosed
information. Notwithstanding the foregoing, following the Effective Date, the
Parties shall issue a press release, substantially in the form of EXHIBIT 7.4,
to announce the execution of this Agreement, together with a corresponding
Question & Answer outline for use that has been approved in advance by both
Parties for the purpose of responding to inquiries about the Agreement;
thereafter, each of AZ and CK may each disclose to Third Parties the information
contained in such press release and Question & Answer outline without the need
for further approval by the other. In addition, with the advance review and
prior written approval of the other Party in each instance, each Party is
authorized to issue additional press releases when amounts such as milestone
payments or licensing fees become due under this Agreement.

      7.5 PUBLICATION. Each Party acknowledges the other Party's interest in
publishing the results of the Research Program, obtaining valid patent
protection, and protecting business interests and trade secrets. Consequently,
if (i) CK, its employees, agents or consultants wish to make a publication
related to the CK Compounds or the AZ Compounds (it is understood that CK will
not disclose the identity of the AZ Compounds or other Confidential Information
of AZ without AZ's prior written consent), or (ii) AZ, its employees, agents or
consultants wish to make a publication regarding the use of the Cytometrix(TM)
Hepatotoxicity Module or CM System in any manner, with or without the CK
Compounds (it is understood that AZ will not disclose Confidential Information
of CK without CK's prior written consent), in each case, such Party shall
deliver to the other Party a copy of the proposed written publication or an
outline of an oral disclosure at least thirty (30) days prior to submission for
publication or presentation. The reviewing Party may (a) propose modifications
to the publication for patent reasons or business reasons, (b) delete any trade
secrets or Confidential Information of such Party included in that publication,
or (c) request a reasonable delay in publication or presentation to protect
know-how and patentable subject matter. Once a particular public disclosure has
been approved, either Party may disclose the information contained therein in
subsequent disclosures.

      7.6 OUTSOURCING OF IT TECHNOLOGY SERVICES.

            7.6.1 RIGHT TO OUTSOURCE. Without limiting the foregoing
confidentiality provisions, during the Pilot License Term and the Full License
Term, AZ shall have the right to appoint a Third Party ("OUTSOURCER") to provide
information technology "outsourcing" services

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to AZ and its Affiliates that relates to the subject matter of this Agreement
("OUTSOURCE SERVICES") for the purposes of enabling AZ to perform under the
Agreement or enabling AZ to use Technology and or information licensed under
this Agreement, only on behalf of AZ and for the purposes permitted under this
Agreement. Outsource Services include loading any software licensed under the
Agreement onto equipment owned or controlled by the Outsourcer, located either
at the AZ Facility, an Outsourcer's premises or at the CK Facility. In
connection with an Outsourcer providing Outsource Services, CK shall permit the
Outsourcer to access, operate and use such software on its equipment in its
performance of the Outsource Services, and shall otherwise permit the
Outsourcer, in its performance of the Outsource Services, to do anything that AZ
or its Affiliates are not precluded from doing under the Agreement that are
reasonably connected to the Outsource Services, such as accessing, operating and
using items supplied or licensed under the Agreement, and receiving and using
services provided under the Agreement.

            7.6.2 COOPERATION WITH OUTSOURCER. AZ shall provide to CK a copy of
its agreement with any Outsourcer, to the extent relevant to either Party's
activities, rights or obligations under this Agreement. CK shall reasonably
cooperate with any authorized Outsourcer in the Outsourcer's performance of the
Outsource Services. In order to provide Outsource Services to AZ under this
Agreement, it may be necessary for Outsourcer to have access to CK Confidential
Information. Outsourcer shall be bound by terms of confidentiality no less
restrictive than those contained in this Agreement as applied to AZ.

                      ARTICLE VIII - TERM AND TERMINATION

      8.1 TERM; EXPIRATION. This Agreement will commence upon the Effective Date
and unless terminated as provided in this Article VIII shall continue in full
force and effect until twelve (12) months following payment by AZ of the tenth
(10th) Annual License Renewal Fee pursuant to Section 6.3.

      8.2 EARLY TERMINATION.

            8.2.1 MATERIAL BREACH. At any time during the Term, if a Party
materially breaches this Agreement and does not cure that material breach within
thirty (30) days after written notice from the non-breaching Party, then upon
further written notice the non-breaching Party may terminate this Agreement. If
within thirty (30) days following notice of breach from the non-breaching Party,
the Party allegedly in breach initiates a dispute resolution procedure in good
faith and as permitted under this Agreement for resolution of the dispute for
which termination is being sought and is diligently pursuing such procedure
(including any litigation or arbitration following therefrom), then termination
is effective only if at the conclusion of the dispute resolution procedure, the
initiating Party notifies the other Party in writing that the termination shall
take effect. The non-breaching Party may, however, withhold or suspend
performance of its obligations during the pendency of such dispute resolution
procedure, without being considered to be in breach of its obligations
hereunder, and without liability for having so withheld or suspended
performance. Notwithstanding anything to the contrary in this Section 8.2.1,
however, if the breach is a failure to pay amounts due under Sections 6.2 or
6.3, then the licenses granted to AZ by CK shall not continue during pendency of
the dispute.

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AZ AND CK CONFIDENTIAL

            8.2.2 [INTENTIONALLY LEFT BLANK.]

            8.2.3 MUTUALLY FOR LACK OF FEASIBILITY. If the Parties mutually
determine that installing and implementing the Cytometrix(TM) Hepatotoxicity
Module in a manner that meets the Performance Criteria is not scientifically or
commercially feasible, or if the Parties mutually determine, after installing
the Cytometrix(TM) Hepatotoxicity Module at the AZ Facility, that it has
material deficiencies that cannot reasonably be remedied, then by mutual written
agreement the Parties may terminate this Agreement.

            8.2.4 BY AZ FOR ITS CONVENIENCE DURING LATER FULL LICENSE TERM.
During the sixth (6th) through tenth (10th) years of the Full License Term and
not before, and provided that AZ is in compliance with its obligations under
this Agreement and has paid all amounts previously due, for any reason or no
reason, AZ may terminate this Agreement by providing written notice of
non-renewal at least thirty (30) days prior to the date on which the annual
renewal license fee would be due.

            8.2.5 BY AZ FOR ITS CONVENIENCE PRIOR TO SIXTH YEAR OF THE FULL
LICENSE TERM. At any time after the Research Term and prior to the sixth year of
the Full License Term, for any reason or for no reason, AZ may terminate this
Agreement by providing written notice at least ninety (90) days prior to such
termination.

            8.2.6 BY EITHER PARTY FOR INSOLVENCY. At any time during the Term,
if either Party is subject to an Insolvency Event (defined below), then the
other Party may terminate this Agreement upon thirty (30) days prior written
notice to the other Party. For purposes of the foregoing, an "Insolvency Event"
is any of the following: (i) making a general assignment for the benefit of
creditors; (ii) filing an insolvency petition in bankruptcy (other than a
petition for reorganization); (iii) petitioning for or acquiesces in the
appointment of any receiver, trustee or similar officer to liquidate or conserve
its business or any substantial part of its assets; (iv) commencing under the
laws of any jurisdiction any proceeding involving its dissolution or liquidation
or any other similar proceeding; (v) ceasing to carry on the whole or
substantially the whole of its business or that part of its business to which
this Agreement relates; or (vi) becoming a party to any proceeding or action of
the type described above in (iii) or (iv) and such proceeding or action remains
undismissed or unstayed for a period of sixty (60) days.

      8.3 CONSEQUENCES OF EXPIRATION OR TERMINATION.

            8.3.1 SURVIVAL. In all events of expiration or termination the
provisions of Articles I (Definitions), VII (Confidentiality), and X
(Miscellaneous), and Sections 2.8(Information and Reports), 4.2 (Permitted
Activities), 5.1 (Ownership) (including 5.1.4 (License to AZ Improvements), 5.4
(Knowledge Licenses), 5.7.2 (Record Keeping), 5.8 (No Implied Licenses), 6.4
(Taxes), 8.3 (Consequences of Expiration or Termination), 9.2 (Warranty
Disclaimer) and 9.3 (No Liability) shall survive. In addition, the Full License
under Section 5.7 survives in any event if it has become fully paid-up pursuant
to the last sentence of Section 6.3 (License Renewal Fee).

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AZ AND CK CONFIDENTIAL

            8.3.2 OTHER CONSEQUENCES. The following are in addition to any
Sections that survive under Section 8.3.1. Sections or rights not noted as
surviving terminate on termination of the Agreement. In each case, on
termination each Party promptly shall return to the other Party any Technology
or Confidential Information of the other Party, except to the extent the
licenses granted pursuant to this Agreement to such Technology or Confidential
Information survive.

                  (a) In the event of expiration pursuant to Section 8.1 (Term;
Expiration), Section 3.2.6 and Section 3.2.7 (Compounds) survive for the period
indicated therein, licenses to Background Technology (Section 5.2) and Compounds
and Compound Data (Section 5.3) survive, all licenses to Collaboration
Technology under Section 5.5.1 survive, CK may retain the physical AZ Compounds
and AZ Compound Data in its possession, and each Party shall retain identical
copies of the images and derived data generated during the Research Term.

                  (b) In the event of termination by AZ under Section 8.2.1
(Material Breach by CK): (i) AZ has no further requirement to pay FTE costs, the
Milestone Payment, the Annual License Renewal Fees or any other amounts not
already due and owing; (ii) the licenses from CK to AZ for CK Background
Technology (Section 5.2) and CK Compounds and CK Compound Data (Section 5.3)
survive and AZ may retain the physical CK Compounds and CK Compound Data in its
possession; (iii) CK shall return to AZ all AZ Compounds in its possession, and,
for avoidance of doubt, AZ has no obligation to provide AZ Compounds under
Section 3.2.6; (iv) the license from CK to AZ for Collaboration Technology
(under either Section 5.5.1 or Section 5.5.2, as appropriate) survive; (v) where
such termination occurs prior to the end of the Pilot License Term, CK will be
deemed to have granted a license to the components or portions of the
Cytometrix(TM) Hepatotoxicity Module installed at AZ Facilities, on the same
terms as Section 5.7, but without payment of further fees; (vi) where such
termination occurs during the Full License Term, the license granted to the
Cytometrix(TM) Hepatotoxicity Module to AZ continues in accordance with its
terms without additional payment of fees; (vii) CK shall deliver to AZ all
images and derived data generated during the Research Term in its possession;
and (viii) the restriction under the last sentence of Section 5.5.1 no longer
applies.

                  (c) In the event of termination by CK under Section 8.2.1
(Material Breach by AZ): (i) AZ shall pay, in each case to the extent not yet
paid, any remaining FTE costs, the Milestone Payment, and the unpaid balance of
the first [*] Annual License Renewal Fees; (ii) the licenses from AZ to CK for
AZ Background Technology (Section 5.2) and AZ Compounds and AZ Compound Data
(Section 5.3) survive and CK may retain the physical AZ Compounds and AZ
Compound Data in its possession; (iii) AZ's obligation to provide Proprietary AZ
Compounds under Section 3.2.6 and Section 3.2.7 continues for the time
indicated, regardless of whether or not the Research Term has been completed;
(iv) in the event that such termination occurs prior to the end of the Research
Term, AZ's obligations with respect to exclusivity of efforts (Section 4.1)
continue for an additional [*] ([*]) month period; and (v) AZ shall deliver to
CK all images and derived data generated during the Research Term in its
possession.

                  (d) [INTENTIONALLY LEFT BLANK.]

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AZ AND CK CONFIDENTIAL

                  (e) In the event of termination under Section 8.2.3 (Mutually
for Lack of Feasibility): (i) AZ shall pay remaining unpaid FTE costs (if any);
(ii) the licenses from AZ to CK for AZ Background Technology (Section 5.2), and
AZ Compounds and AZ Compound Data (Section 5.3) survive and CK may retain the
physical AZ Compounds and AZ Compound Data in its possession; (iii) the license
from CK to AZ for Collaboration Technology (under either Section 5.5.1 or
Section 5.5.2, as appropriate) survive; (iv) the Cytometrix(TM) Hepatotoxicity
Module (including backups thereof) shall be removed from any AZ Facilities in
which it has been installed, and all licenses granted to AZ thereunder shall
terminate; and (v) each Party shall retain identical copies of the images and
derived data generated during the Research Term.

                  (f) In the event of termination or non-renewal by AZ under
Section 8.2.4 (AZ Convenience During Later Full License Term): (i) the license
from CK to AZ for Collaboration Technology under Section 5.5.1 survives; (ii)
the licenses from AZ to CK for AZ Background Technology (Section 5.2) and AZ
Compounds and AZ Compound Data (Section 5.3) survive, and CK may retain the
physical AZ Compounds and AZ Compound Data in its possession; and (iii) the
Cytometrix(TM) Hepatotoxicity Module (including backups thereof) shall be
removed from any AZ Facilities in which it has been installed, and all licenses
granted to AZ thereunder shall terminate; and (v) each Party shall retain
identical copies of the images and derived data generated during the Research
Term.

                  (g) In the event of termination or non-renewal by AZ under
Section 8.2.5 (AZ Convenience Prior to [*] Year of the Full License Term): (i)
AZ shall pay, in each case to the extent not yet paid, any remaining FTE costs,
the Milestone Payment, and the unpaid balance of the first [*] Annual License
Renewal Fees; (ii) the license from CK to AZ for Collaboration Technology under
Section 5.5.1 survives; (iii) the licenses from AZ to CK for AZ Background
Technology (Section 5.2) and AZ Compounds and AZ Compound Data (Section 5.3)
survive, and CK may retain the physical AZ Compounds and AZ Compound Data in its
possession; (iv) AZ's obligation to provide AZ Compounds under Section 3.2.6
continues and Section 3.2.7 survives; (iv) the Cytometrix(TM) Hepatotoxicity
Module (including backups thereof) shall be removed from any AZ Facilities in
which it has been installed, and all licenses granted to AZ thereunder shall
terminate; and (v) each Party shall retain identical copies of the images and
derived data generated during the Research Term.

                  (h) In the event of termination by either Party under Section
8.2.6 (Insolvency): (i) licenses already granted (to and from the insolvent
Party) continue in accordance with their terms and subject to payment of related
fees; (ii) each Party shall pay for services already provided; and (iii) each
Party shall retain identical copies of the images and derived data generated
during the Research Term.

      8.4 ACCRUED LIABILITY. Termination or expiration of this Agreement for any
reason shall not release either Party hereto from any liability that at the time
of such termination or expiration has already accrued to the other Party prior
to such time including any and all damages arising from any breach hereunder.
Such termination or expiration will not relieve a Party from accrued payment
obligations or from obligations that are expressly indicated in this Agreement
to survive termination or expiration of this Agreement.

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  omitted portions.

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      8.5 TERMINATION NOT SOLE REMEDY. Termination is not the sole remedy under
this Agreement and, whether or not termination is effected, all other remedies
will remain available except as agreed to otherwise herein.

                   ARTICLE IX - WARRANTY AND INDEMNIFICATION

      9.1 REPRESENTATIONS AND WARRANTIES. Each Party hereby represents and
warrants and covenants as follows:

                  (a) it is duly organized and validly existing under the laws
of the jurisdiction of its incorporation and has full corporate power and
authority to enter into this Agreement and is in good standing with all relevant
governmental authorities;

                  (b) this Agreement is a legal and valid obligation binding
upon such Party and enforceable in accordance with its terms; and accordingly,
it has taken all corporate actions necessary to authorize the execution and
delivery of this Agreement and the performance of its obligations under this
Agreement;

                  (c) the execution, delivery and performance of the Agreement
by such Party does not conflict with any agreement, instrument or understanding,
oral or written, to which it is a party or by which it is bound, nor violate any
law or regulation of any court, governmental body or administrative or other
agency having jurisdiction over it;

                  (d) it has not, and during the term of the Agreement will not,
grant any right to any Third Party relating to its respective Technology in the
Field which would conflict with the rights granted to the other Party hereunder;

                  (e) it has the requisite rights to grants the licenses set
forth under this Agreement; and further, to the best of its knowledge, as of the
Effective Date there is no pending litigation or claim, and no basis for such
claim, challenging its right to grant the rights herein; and

                  (f) the execution, delivery and performance of this Agreement
will not result in a violation of, or be in material conflict with, or
constitute a material default, under any agreement in existence as of the
Effective Date between CK and Third Parties and that CK is not party to any
agreements that limit or in any other way affect or impair AZ's rights or
obligations under this Agreement, including but not limited to CK's rights and
obligations under that certain agreement between CK and GlaxoSmithKline dated
June 20, 2001.

      9.2 WARRANTY DISCLAIMER. EXCEPT FOR ANY EXPRESS WARRANTY SET FORTH WITHIN
THIS AGREEMENT, ALL COMPOUNDS, THE CM SYSTEM, THE CYTOMETRIX HEPATOTOXICITY
MODULE, TECHNOLOGY AND OTHER MATERIALS PROVIDED BY THE PARTIES HEREUNDER ARE
PROVIDED "AS IS" AND TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW THE
PARTIES HEREBY DISCLAIM AND EXCLUDE ANY AND ALL REPRESENTATIONS,

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WARRANTIES, CONDITIONS OR OTHER TERMS, WHETHER WRITTEN OR ORAL, EXPRESSED OR
IMPLIED, INCLUDING ANY REPRESENTATION OR WARRANTY OF QUALITY, PERFORMANCE,
MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE OR PURPOSE.

      9.3 NO LIABILITY WITH RESPECT TO COMPOUNDS AND COMPOUND DATA. TO THE
FULLEST EXTENT PERMITTED BY APPLICABLE LAW, NEITHER PARTY SHALL BE LIABLE TO THE
OTHER PARTY, OR ANY OF ITS EMPLOYEES OR AGENTS, WHETHER FOR BREACH OF CONTRACT,
NEGLIGENCE OR OTHERWISE, WITH REGARD TO THE PROVISION OF COMPOUNDS OR COMPOUND
DATA, EXCEPT FOR A BREACH OF ITS OBLIGATIONS TO DELIVER AND LICENSE SUCH
COMPOUNDS OR COMPOUND DATA UNDER THIS AGREEMENT IN ACCORDANCE WITH THE TERMS
HEREOF.

      9.4 INDEMNITY.

            9.4.1 INDEMNIFICATION BY CK. In addition to any other remedy
available to AZ, CK shall indemnify, defend and hold harmless AZ, its Affiliates
and its and their respective agents, employees, officers and directors (the "AZ
INDEMNITEES") from and against any and all liability, claims, demands, causes of
action, damage, loss, cost or expense (including reasonable attorneys' fees)
arising out of Third Party claims or suits to the extent resulting from: (i)
CK's performance of, or failure to perform, its obligations under this
Agreement; or (ii) breach by CK of any of its representations and warranties
under Section 9.1 above, provided, however, that CK's obligations pursuant to
this Section 9.4 shall not apply to the extent such claims or suits result from
the negligence or willful misconduct of any of the AZ Indemnitees.

            9.4.2 INDEMNIFICATION BY AZ. In addition to any other remedy
available to CK, AZ shall indemnify, defend and hold harmless CK, its Affiliates
and its and their respective agents, employees, officers and directors (the "CK
INDEMNITEES") from and against any and all liability, claims, demands, causes of
action, damage, loss, cost or expense (including reasonable attorneys' fees)
arising out of Third Party claims or suits to the extent resulting from: (i)
AZ's performance of, or failure to perform, its obligations under this
Agreement; or (ii) breach by AZ of any of its representations and warranties
under Section 9.1 above; provided, however, that AZ's obligations pursuant to
this Section 9.4 shall not apply to the extent such claims or suits result from
the negligence or willful misconduct of any of the CK Indemnitees.

            9.4.3 NOTIFICATION OF CLAIM; CONDITIONS TO INDEMNIFICATION
OBLIGATIONS.

                  (a) As a condition to a Party's right to receive
indemnification under this Section 9.4, it shall: (i) promptly notify ("CLAIM
NOTICE") the other Party as soon as it becomes aware of a claim or suit for
which indemnification may be sought pursuant hereto (provided that the failure
to give a Claim Notice promptly shall not prejudice the rights of an indemnified
Party except to the extent that the failure to give such prompt notice
materially prejudices the indemnifying Party; however, in no event shall the
indemnifying Party be liable for any loss that results from any delay in
providing the Claim Notice); (ii) cooperate with the indemnifying Party in the
defense of such claim or suit, at the expense of the indemnifying Party,
including

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providing reasonable information, including, but not limited to, copies of all
papers and official documents received in respect of any such loss; and (iii) if
the indemnifying Party confirms in writing to the indemnified Party its
intention to defend such claim or suit within ten (10) days of receipt of the
Claim Notice, permit the indemnifying Party to control the defense of such claim
or suit, including without limitation the right to select defense counsel;
provided that if the indemnifying Party fails to (x) provide such confirmation
in writing within the ten (10) day period or (y) diligently and reasonably
defend such suit or claim at any time, its right to defend the claim or suit
shall terminate immediately in the case of (x) and otherwise upon twenty (20)
days' written notice to the indemnifying Party without cure and the indemnified
Party may assume the defense of such claim or suit at the sole expense of the
indemnifying Party and may settle or compromise such claim or suit without the
consent of the indemnifying Party. In no event, however, may the indemnifying
Party compromise or settle any claim or suit in a manner which admits fault or
negligence on the part of any indemnified Party or that otherwise materially
affects such indemnified Party's rights or requires any payment by an
indemnified Party without the prior written consent of such indemnified Party.
Subject as expressly provided above, the indemnifying Party will have no
liability under this Section 9.4 with respect to claims or suits settled or
compromised (including by admission) without its prior written consent.

                  (b) Each Claim Notice shall contain a description of the claim
and the nature and amount of the loss claimed (to the extent that the nature and
amount of such loss is known at such time).

                           ARTICLE X - MISCELLANEOUS

      10.1 GOVERNING LAW. The interpretation and construction of this Agreement
and any dispute arising from the performance or breach hereof shall be governed
by and construed and enforced in accordance with, the laws of the State of New
York, United States of America, excluding any conflicts or choice of law rule or
principle that might otherwise refer construction or interpretation of this
Agreement to the substantive law of another jurisdiction.

      10.2 DISPUTE RESOLUTION. Prior to initiating any proceeding before a court
or arbitrator, or in another tribunal, all outstanding matters arising under
this Agreement must be submitted to the JSC for good faith negotiation as
described in Section 2.4, and then for resolution pursuant to Section 2.5.
Matters not resolved under Section 2.5 will be referred to the Chief Executive
Officer for CK, and Executive Vice President, Head of Global Discovery Research
for AZ (collectively the "SENIOR MANAGEMENT") for resolution. Any final decision
mutually agreed to by Senior Managements of the Parties shall be in writing and
shall be conclusive and binding on the Parties. If resolution cannot be reached
by the Senior Management within thirty (30) days from the date the matter in
dispute is first brought to the attention of the Senior Management, the dispute
is subject to arbitration under Section 10.3.

      10.3 ARBITRATION. Except as set forth in Sections 2.4 and 2.5, any dispute
arising out of or relating to the negotiation, interpretation, breach or
performance of this Agreement shall be settled by binding arbitration in
accordance with the rules of arbitration indicated below. The number of
arbitrators shall be three (3), of whom each Party shall appoint one (1). The
two

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arbitrators so appointed will select the third and final arbitrator. The place
of arbitration shall be San Francisco, California. The language used in the
arbitration proceedings shall be English. The proceedings, including any
outcome, shall be confidential. The arbitration shall be governed by the United
States Arbitration Act 9 U.S.C. Sections 1-16 to the exclusion of any
inconsistent state laws and judgment on the award rendered by the arbitration
may be entered by any court having jurisdiction. Nothing in this Article X will
preclude either Party from seeking interim or provisional relief from a court of
competent jurisdiction, including a temporary restraining order, preliminary
injunction or other interim equitable relief, concerning a dispute either prior
to or during any arbitration if necessary to protect the interests of such Party
or to preserve the status quo pending the arbitration proceeding.

      10.4 ASSIGNMENT. This Agreement shall not be assignable by either Party to
any Third Party hereto without the written consent of the other Party hereto;
except that either Party shall always have the right, without such consent, (a)
to perform any or all of its obligations and exercise any or all of its rights
under this Agreement through any of its Affiliates, and (b) on written notice to
the other Party, assign any or all of its rights and delegate any or all of its
obligations hereunder to any of its Affiliates or to any successor in interest
(whether by merger, acquisition, asset purchase or otherwise) to all or
substantially all of the business to which this Agreement relates. Any permitted
successor of a Party or any permitted assignee of all of a Party's rights under
this Agreement that has also assumed all of such Party's obligations hereunder
in writing shall, upon any such succession or assignment and assumption, be
deemed to be a party to this Agreement as though named herein. All validly
assigned rights of a Party shall inure to the benefit of and be enforceable by,
and all validly delegated obligations of such Party shall be binding on and be
enforceable against, the permitted successors and assigns of such Party,
provided that such Party, if it survives, shall remain jointly and severally
liable for the performance of such delegated obligations under this Agreement.
Any attempted assignment or delegation in violation of this Section 10.4 shall
be void.

      10.5 PERFORMANCE WARRANTY. AZ hereby warrants and guarantees the
performance of any and all rights and obligations by its Affiliate(s).

      10.6 DEBARMENT. To the extent required by applicable law, neither Party
shall use, in any capacity, in connection with the performance of its
obligations under this Agreement, any person debarred or subject to debarment or
otherwise disqualified or suspended from performing the Research Program or
otherwise subject to any restrictions or sanctions by any other governmental or
regulatory authority or professional body with respect to the performance of the
Research Program. Accordingly, to the extent applicable, a Party shall
immediately notify the other Party in writing if any person who is performing
under this Agreement is or becomes debarred or if any action, suit, claim,
investigation, or other legal or administrative proceeding is pending or, to the
best of the Party's knowledge, threatened, that would make any person performing
hereunder a person that is debarred or would preclude the Party from performing
its obligations under this Agreement.

      10.7 FORCE MAJEURE. Except with respect to payment of money, no Party
shall be liable to the other for failure or delay in the performance of any of
its obligations under this

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Agreement for the time and to the extent such failure or delay is caused by
earthquake, riot, civil commotion, war, terrorist acts, strike, flood, or
governmental acts or restriction, or other cause that is beyond the reasonable
control of the respective Party. The Party affected by such force majeure will
provide the other Party with full particulars thereof as soon as it becomes
aware of the same (including its best estimate of the likely extent and duration
of the interference with its activities), and will use commercially reasonable
efforts to overcome the difficulties created thereby and to resume performance
of its obligations as soon as practicable. If the performance of any such
obligation under this Agreement is delayed owing to such a force majeure for any
continuous period of more than one hundred eighty (180) days, the Parties hereto
will consult with respect to an equitable solution, including the possibility of
the mutual termination of this Agreement.

      10.8 NOTICES. All notices, requests and communications hereunder shall be
in writing and shall be personally delivered or sent by facsimile or e-mail
transmission (receipt confirmed), mailed by registered or certified mail (return
receipt requested), postage prepaid, or sent by international express courier
service, and shall be deemed to have been properly served to the addressee upon
receipt of such written communication, to following addresses of the Parties, or
such other address as may be specified in writing to the other Party hereto:

      IF TO CK,

             ADDRESSED TO:     CYTOKINETICS, INC.
                               280 East Grand Avenue
                               South San Francisco, CA 94080-4808
                               Attention: Robert Blum, Senior Vice President,
                               Finance and Corporate Development, and Chief
                               Financial Officer
                               Telephone: (650) 624-3000
                               Telecopy: (650) 624-3010
                               E-mail: rblum@cytokinetics.com

             WITH A COPY TO:   WILSON SONSINI GOODRICH & ROSATI, PC
                               650 Page Mill Road
                               Palo Alto, CA 94304-1050
                               Attention: Kenneth A. Clark, Esq.
                               Telephone: 415-493-9300
                               Telecopy: 415-493-6811
                               E-mail: kclark@wsgr.com

      IF TO AZ,

             ADDRESSED TO:     ASTRAZENECA AB
                               R&D Headquarters
                               S-151 85 Sodertalje, Sweden
                               Attention: Jan Lundberg

                                      -35-
<PAGE>
AZ AND CK CONFIDENTIAL

                               Executive Vice President, Discovery Research
                               Telephone: [*]
                               E-mail: [*]

             WITH A COPY TO:   ASTRAZENECA AB
                               LEGAL DEPARTMENT
                               S-151 85 Sodertalje, Sweden
                               Attention: Johannes Linde
                               Associate General Counsel
                               Telephone: [*]
                               Telecopy: [*]

      10.9 WAIVER. Neither Party may waive or release any of its rights or
interests in this Agreement except in writing. The failure or either Party to
assert a right hereunder or to insist upon compliance with any term or condition
of this Agreement shall not constitute a waiver of that right or excuse a
similar subsequent failure to perform any such term or condition. No waiver by
either Party of any condition or term in any one or more instances shall be
construed as a continuing waiver of such condition or term or of another
condition or term.

      10.10 SEVERABILITY. If any provision hereof should be held invalid,
illegal or unenforceable in any jurisdiction, the Parties shall negotiate in
good faith a valid, legal and enforceable substitute provision that most nearly
reflects the original intent of the Parties and all other provisions hereof
shall remain in full force and effect in such jurisdiction and shall be
liberally construed in order to carry out the intentions of the Parties hereto
as nearly as may be possible. Such invalidity, illegality or unenforceability
shall not affect the validity, legality or enforceability of such provision in
any other jurisdiction. In the event a Party seeks to avoid a provision of this
Agreement by asserting that such provision is invalid, illegal or otherwise
unenforceable, the other Party shall have the right to terminate this Agreement
upon thirty (30) days' prior written notice to the asserting Party, unless such
assertion is eliminated and the effect of such assertion cured within such
thirty (30)-day period. Any termination in accordance with the foregoing
sentence shall be deemed a termination pursuant to Section 8.2 and the Party who
made such assertion shall be deemed the breaching Party.

      10.11 DAMAGES EXCLUSION AND LIMITATION. EXCEPT WITH RESPECT TO DAMAGES OR
OBLIGATIONS ARISING OUT OF UNAUTHORIZED EXPLOITATION OF THE OTHER PARTY'S
INTELLECTUAL PROPERTY RIGHTS OR BREACH OF ARTICLE VII, IN NO EVENT WILL EITHER
PARTY OR ANY OF ITS RESPECTIVE AFFILIATES BE LIABLE TO THE OTHER PARTY OR ANY OF
ITS AFFILIATES FOR SPECIAL, INDIRECT, CONSEQUENTIAL, INCIDENTAL, EXEMPLARY, OR
PUNITIVE DAMAGES, WHETHER IN CONTRACT, WARRANTY, TORT, NEGLIGENCE, STRICT
LIABILITY OR OTHERWISE, INCLUDING BUT NOT LIMITED TO, LOSS OF PROFITS OR REVENUE
OR CLAIMS OF CUSTOMERS OF ANY OF THEM OR OTHER THIRD PARTIES FOR SUCH DAMAGES.
The forgoing applies to obligations and damages under Article IX.

* Certain information on this page has been omitted and filed separately with
  the Commission. Confidential treatment has been requested with respect to the
  omitted portions.

                                      -36-
<PAGE>
AZ AND CK CONFIDENTIAL

      10.12 ENTIRE AGREEMENT. This Agreement sets forth all the covenants,
promises, agreements, warranties, representations, conditions and understandings
between the Parties hereto and supersedes and terminates all prior agreements
and understanding between the Parties with respect to the subject matter hereof,
including that certain Mutual Non-Disclosure Agreement between the Parties dated
January 29, 2003 (the "NDA"), as amended on July 9, 2003, and on August 11,
2003. Notwithstanding the foregoing, all information exchanged between the
Parties pursuant to the NDA shall be deemed Confidential Information of the
Party that disclosed it thereunder and shall be subject to the terms of this
Article VII. There are no covenants, promises, agreements, warranties,
representations conditions or understandings, either oral or written, between
the Parties with respect to the subject matter hereof other than as set forth
herein. No subsequent alteration, amendment, change or addition to this
Agreement shall be binding upon the Parties hereto unless reduced to writing and
signed by the respective authorized officers of the Parties.

      10.13 INDEPENDENT CONTRACTORS. Nothing herein shall be construed to create
any relationship of employer and employee, agent and principal, partnership or
joint venture between the Parties. Each Party is an independent contractor.
Neither Party shall assume, either directly or indirectly, any liability of or
for the other Party. Neither Party shall have the authority to bind or obligate
the other Party and neither Party shall represent that it has such authority.

      10.14 HEADINGS. Headings used herein are for convenience only and shall
not in any way affect the construction of or be taken into consideration in
interpreting this Agreement.

      10.15 COUNTERPARTS AND FACSIMILE SIGNATURES. This Agreement may be
executed in two counterparts, each of which shall be deemed an original, and all
of which together, shall constitute one and the same instrument. This Agreement
may be executed as counterparts and the signature page delivered by facsimile.
The Parties agree that such execution and facsimile delivery shall have the same
force and effect as delivery of an original document with original signatures,
and that each Party may use such facsimile signatures as evidence of the
execution and delivery of this Agreement by both Parties.

              [The remainder of this page left intentionally blank]

                                      -37-
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AZ AND CK CONFIDENTIAL

      IN WITNESS WHEREOF, this Agreement is executed by the authorized
representatives of the Parties as of the Effective Date.

ASTRAZENECA AB                             CYTOKINETICS, INC.

By:                                        By:
   --------------------------------           ----------------------------------
Name:  Jan Lundberg                        Name: Robert I. Blum

Title: Executive Vice President,           Title: Senior Vice President, Finance
       Discovery Research                  and Corporate Development, and CFO

                                      -38-
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                                  EXHIBIT 1.3

                            AZ BACKGROUND TECHNOLOGY

                                      [*]

*  Certain information on this page has been omitted and filed separately with
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   omitted portions.
<PAGE>

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                            EXHIBIT 1.4: AZ COMPOUNDS

         The heading in each column indicates whether the information in that
column should be provided for Public Compounds, Proprietary Compounds, or both.
Information identified with *** is to be provided as of the Effective Date.

<TABLE>
<CAPTION>

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</TABLE>

--------
(1) Such an identifier must be unique, but need not be the identifier used
    internally at the providing Party.

(2) If Compound is Proprietary, then in addition to the target class, identify
    whether the molecular target is the same.

(3) Reported as an EC50.

(4) Reported as a curve, not as an EC50.

*  Certain information on this page has been omitted and filed separately with
   the Commission. Confidential treatment has been requested with respect to the
   omitted portions.
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                                      -2-

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                                     -3-
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                                      -4-
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                                      -5-
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                                      -6-
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</TABLE>

*    Certain information on this page has been omitted and filed separately with
     the Commission. Confidential treatment has been requested with respect to
     the omitted portions.

                                      -8-
<PAGE>

AZ AND CK CONFIDENTIAL

                                  EXHIBIT 1.10

                            CK BACKGROUND TECHNOLOGY

         CK Background Technology comprises the Technology disclosed in the
following patents and patent applications.

<TABLE>
<CAPTION>
            APPLN. NO. /    FILING
CASE NO.     (PUB. NO.)      DATE                TITLE / SUBJECT MATTER                STATUS / NOTES
------------------------------------------------------------------------------------------------------
<S>         <C>            <C>        <C>                                             <C>
1008        [*]            [*]        [*]                                             Pending

------------------------------------------------------------------------------------------------------
1008A       [*]            [*]        [*]                                             Pending

------------------------------------------------------------------------------------------------------
1009        [*]            [*]        [*]                                             Pending

------------------------------------------------------------------------------------------------------
1009A       [*]            [*]        [*]                                             [*]

------------------------------------------------------------------------------------------------------
1009B       [*]            [*]        [*]                                             [*]

------------------------------------------------------------------------------------------------------
1009C       [*]            [*]        [*]                                             Pending

------------------------------------------------------------------------------------------------------
1009D       [*]            [*]        [*]                                             [*]

------------------------------------------------------------------------------------------------------
1011        [*]            [*]        [*]                                             Pending

------------------------------------------------------------------------------------------------------
1011A       [*]            [*]        [*]                                             [*]

------------------------------------------------------------------------------------------------------
1011B       [*]            [*]        [*]                                             Pending

------------------------------------------------------------------------------------------------------
1011PCT     [*]            [*]        [*]                                             [*]

------------------------------------------------------------------------------------------------------
1011EP      [*]            [*]        [*]                                             Pending

------------------------------------------------------------------------------------------------------
1011.1      [*]            [*]        [*]                                             Pending

------------------------------------------------------------------------------------------------------
1011.1PCT   [*]            [*]        [*]                                             [*]

------------------------------------------------------------------------------------------------------
1011.1US    [*]            [*]        [*]                                             Pending

------------------------------------------------------------------------------------------------------
</TABLE>

* Certain information on this page has been omitted and filed separately with
  the Commission. Confidential treatment has been requested with respect to the
  omitted portions.
<PAGE>

AZ AND CK CONFIDENTIAL

<TABLE>
<CAPTION>
            APPLN. NO. /    FILING
CASE NO.     (PUB. NO.)      DATE                 TITLE / SUBJECT MATTER                 STATUS / NOTES
---------------------------------------------------------------------------------------------------------
<S>         <C>            <C>        <C>                                               <C>
1011.1EP       [*]            [*]        [*]                                            Pending

---------------------------------------------------------------------------------------------------------
1011.1GB       [*]            [*]        [*]                                            Pending

---------------------------------------------------------------------------------------------------------
1026           [*]            [*]        [*]                                            Pending
---------------------------------------------------------------------------------------------------------
1026PCT        [*]            [*]        [*]                                            [*]

---------------------------------------------------------------------------------------------------------
1027.1         [*]            [*]        [*]                                            Pending

---------------------------------------------------------------------------------------------------------
1027.1PCT      [*]            [*]        [*]                                            [*]

---------------------------------------------------------------------------------------------------------
1027.1EP       [*]            [*]        [*]                                            Pending

---------------------------------------------------------------------------------------------------------
1035.1PCT      [*]            [*]        [*]                                            [*]

---------------------------------------------------------------------------------------------------------
1035.1EP       [*]            [*]        [*]                                            Pending

---------------------------------------------------------------------------------------------------------
1035.1GB       [*]            [*]        [*]                                            Pending

---------------------------------------------------------------------------------------------------------
1036           [*]            [*]        [*]                                            [*]
---------------------------------------------------------------------------------------------------------
1036.1PCT      [*]            [*]        [*]                                            [*]

---------------------------------------------------------------------------------------------------------
1036A          [*]            [*]        [*]                                            Pending

---------------------------------------------------------------------------------------------------------
1036.1EP       [*]            [*]        [*]                                            Pending

---------------------------------------------------------------------------------------------------------
1036.1GB       [*]            [*]        [*]                                            Pending

---------------------------------------------------------------------------------------------------------
1037           [*]            [*]        [*]                                            Pending

---------------------------------------------------------------------------------------------------------
1037PCT        [*]            [*]        [*]                                            [*]

---------------------------------------------------------------------------------------------------------
1037GB         [*]            [*]        [*]                                            Pending

---------------------------------------------------------------------------------------------------------
1037EP         [*]            [*]        [*]                                            Pending

---------------------------------------------------------------------------------------------------------
</TABLE>

* Certain information on this page has been omitted and filed separately with
  the Commission. Confidential treatment has been requested with respect to the
  omitted portions.

                                      -2-

<PAGE>

AZ AND CK CONFIDENTIAL

<TABLE>
<CAPTION>
            APPLN. NO. /     FILING
CASE NO.     (PUB. NO.)       DATE                  TITLE / SUBJECT MATTER                 STATUS / NOTES
-----------------------------------------------------------------------------------------------------------
<S>         <C>             <C>         <C>                                               <C>
1062        [*]              [*]         [*]                                                  Pending
-----------------------------------------------------------------------------------------------------------
1062PCT     [*]              [*]         [*]                                                   [*]
-----------------------------------------------------------------------------------------------------------
1064        [*]              [*]         [*]                                                  Pending
-----------------------------------------------------------------------------------------------------------
1064PCT     [*]              [*]         [*]                                                    [*]
-----------------------------------------------------------------------------------------------------------
1064EP      [*]              [*]         [*]                                                  Pending
-----------------------------------------------------------------------------------------------------------
1074        [*]              [*]         [*]                                                  Pending
-----------------------------------------------------------------------------------------------------------
1131        [*]              [*]         [*]                                                  Pending
-----------------------------------------------------------------------------------------------------------
1132        [*]              [*]         [*]                                                  Pending
-----------------------------------------------------------------------------------------------------------
1146        [*]              [*]         [*]                                                  Pending
-----------------------------------------------------------------------------------------------------------
1146.1      [*]              [*]         [*]                                                  Pending
-----------------------------------------------------------------------------------------------------------
1170        [*]              [*]         [*]                                                  Pending
-----------------------------------------------------------------------------------------------------------
</TABLE>

* Certain information on this page has been omitted and filed separately with
  the Commission. Confidential treatment has been requested with respect to the
  omitted portions.

                                      -3-

<PAGE>

AZ AND CK CONFIDENTIAL

                                  EXHIBIT 1.11

                                  CK COMPOUNDS

<TABLE>
<CAPTION>
       [*]                 [*]               [*]            [*]          [*]           [*]
---------------------------------------------------------------------------------------------
<S>                <C>                 <C>              <C>          <C>           <C>
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       [*]                                   [*]
---------------------------------------------------------------------------------------------
       [*]                                   [*]
---------------------------------------------------------------------------------------------

<CAPTION>
                           [*]               [*]                       [*]                   [*]
----------------------------------------------------------------------------------------------------------------------
<S>               <C>              <C>                        <C>                      <C>            <C>

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

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

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

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

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

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

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

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

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

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

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

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

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

<CAPTION>
       [*]                     [*]                             [*]                  [*]       Comments
------------------------------------------------------------------------------------------------------
<S>                <C>                             <C>                          <C>           <C>
       [*]
------------------------------------------------------------------------------------------------------
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------------------------------------------------------------------------------------------------------
       [*]
</TABLE>

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

(1) Such an identifier must be unique, but need not be the identifier used
    internally at the providing Party.

(2) If Compound is Proprietary, then in addition to the target class, identify
    whether the molecular target is the same.

(3) Reported as an EC50.

(4) Reported as a curve, not as an EC50.

* Certain information on this page has been omitted and filed separately with
  the Commission. Confidential treatment has been requested with respect to the
  omitted portions.
<PAGE>

AZ AND CK CONFIDENTIAL

<TABLE>
<CAPTION>
     [*]              [*]                 [*]             [*]          [*]            [*]
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<S>             <C>                 <C>              <C>           <C>            <C>
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<CAPTION>
       [*]                  [*]                       [*]                      [*]
----------------------------------------------------------------------------------------------------------
<S>               <C>                         <C>                       <C>             <C>

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

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

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

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

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

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

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

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

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

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

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

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

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

<CAPTION>
     [*]                    [*]                           [*]                    [*]       Comments
---------------------------------------------------------------------------------------------------
<S>             <C>                             <C>                          <C>           <C>
     [*]
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</TABLE>

* Certain information on this page has been omitted and filed separately with
  the Commission. Confidential treatment has been requested with respect to the
  omitted portions.

                                      -2-
<PAGE>

AZ AND CK CONFIDENTIAL

                                  EXHIBIT 1.15

                                    CM SYSTEM

The CM System is an automated cell biology platform designed to quantify
cellular phenotypes. Cytokinetics has developed the CM System for use across the
drug discovery process, including target identification and validation, primary
and secondary compound screening, mechanism-of-action studies and compound
attrition management.

The components of the current CM System can be broken down as follows:

         -        Culture and plating of cells

         -        Automated addition of treatments and stains

         -        Variable exposure of cells to treatment

         -        Automated image acquisition

         -        Cell-by-cell image analysis

         -        Quantitative cell-by-cell biological analysis

         -        Statistical analysis to generate compound "fingerprints" and
                  compound classifications

All the experimental data, including images, compound fingerprints and
classifications are available for interpretation and decision support.

                            [CM SYSTEM FLOW DIAGRAM]

CELL CULTURE

A variety of cell lines and primary cell types are used in the CM System. The
phenotype of interest is generally dependent on the cell type. By quantitatively
comparing the response to a treatment across a variety of cell types, a fuller
understanding of the effect of the treatment can be obtained. The cell types
employed in the CM System have been selected for relevance to particular
therapeutic problems, for biological diversity, for responsiveness in CM
profiling experiments, and for reproducibility.

TREATMENT

The CM System can be used to quantify the effects of chemical compounds, or a
variety other treatments, such as antibodies, toxins and transfected siRNAs, on
the chosen cell types. The process of defining the CM experiment and the
resulting required treatment plate format is handled in the in the CM System
LIMS.

<PAGE>

AZ AND CK CONFIDENTIAL

AUTOMATED PLATE PREPARATION

The CM System automation includes the plating of cells, incubation with
treatment and staining of the cells. Quantitative reproducibility of assay
results requires consistent fluidics. The CM System LIMS include data system
interfaces for all fluidics operations.

IMAGING

High-quality imaging provides the primary data for the CM System. Imaging data
are automatically stored to computer disk for analysis.

IMAGE ANALYSIS

Proprietary image analysis algorithms are used to segment images into individual
cells and organelles. A large number of morphological and intensity-related
features are extracted from each image. The CM System uses a scalable
distributed computing architecture designed to take advantage of additional
networked computers as computation demands increase. All results are stored in
the CM System experiment database.

DATA ANALYSIS

CM System data analysis quantifies compound "fingerprints" in three phases:

         -        sub-cellular measurements

         -        biological features

         -        compound fingerprints

The process of generating compound fingerprints uses the image features, such as
object area, intensity, shape, texture, etc., and experimental process
parameters, e.g. drug, concentration, cell line, time point, etc., to generate
so-called biological features. Examples of biological features from
Cytokinetics' cell-cycle work include Mitotic Index, G1 phase, S phase, and
Golgi apparatus classification. Treatment fingerprints are the CM System
representation of the cellular phenotype and are generated from multidimensional
analysis of the biological features. Compound groups are assembled when a group
of compound phenotypes is compared and compounds with similar fingerprints are
assembled.

VISUALIZATION

CM System data can be reviewed at many levels, including visualizing compound
fingerprints, reviewing biological analysis and viewing the original
experimental images. Various biological reports and analyses are generated
allowing access to information and analyses at any of the three levels:

         -        Compound Fingerprint Analyses

                                      -2-
<PAGE>

AZ AND CK CONFIDENTIAL

         -        Standardized and Ad Hoc Biological Reports

         -        Biological Experimental Data

The highest level is the compound fingerprint analyses, examples of which are
Principal Component Analysis (PCA) Plots and Trellis Plots. The former are
three-dimensional representations of the higher-dimensional dose-response data,
the latter are representations of the fingerprint data at a given dose.
Standardized and ad hoc biological reports, include cell-cycle analysis and
dose- and time-response curves. Biological experimental data constitute the
primary level and include all the data collected during the CM System
experiment, such as the treatment name and concentration, cell type, marker,
imaging parameters, extracted features, and exposure time.

An exemplary use of the CM System in compound profiling has the following
hierarchy of data:

                   [TYPES OF DATA GENERATED BY THE CM SYSTEM]

              FIGURE 1: Types of data generated by the CM System.

                                      -3-
<PAGE>

AZ AND CK CONFIDENTIAL

                                  EXHIBIT 1.23

                                  DELIVERABLES

This Exhibit 1.23 defines the Deliverables for the Research Program.

CELL CULTURE

The [*] for preparing and handling the [*] used in the CHM will be [*]. Initial
implementation will be at [*] on [*]. In accordance with the Research Plan, the
[*] will be subsequently [*] at [*] using [*]. The [*] will be [*].

TREATMENT PREPARATION

The CHM [*] and the associated [*] will be [*] for initial implementation at [*]
within [*]. Acknowledging that [*] has its own [*] and [*], [*] will provide to
[*] of the [*], including the definition of the [*] and the [*] enabling [*] to
[*] for use on [*].

AUTOMATED PLATE PREPARATION

The [*] will include [*], [*], and [*]. The [*] for [*] will be [*] and [*]. The
[*] will include both [*] and [*] for all necessary [*]. Again, acknowledging
that [*] has its own [*] and [*], [*] will provide to [*] on the [*], enabling
[*] to [*] for use on [*].

IMAGING

The [*] will be generated at [*] using an [*] or comparable [*] and [*]. The
data will be [*] for subsequent [*] and [*]. The [*], [*] and [*] for [*] and
[*] to specific locations to support the [*] will be [*], documented [*] for
usage on [*] and [*].

* Certain information on this page has been omitted and filed separately with
  the Commission. Confidential treatment has been requested with respect to the
  omitted portions.

<PAGE>

AZ AND CK CONFIDENTIAL

IMAGE ANALYSIS

The parties will develop CHM [*] characterizing [*], [*], [*]. Those [*] will be
[*], [*] and [*] at [*] during the [*]. [*] and [*] will be stored in the [*].
[*] will [*] the [*] and [*] and [*] of the [*] as part of the CHM.

DATA ANALYSIS

The parties will [*], [*] and [*] CHM [*] analogous to
[*], as appropriate to [*]. [*] will document and provide to [*] for
[*] for use at [*]
as part of the CHM. [*] will [*] of this [*] on [*] and [*] at [*] on the [*].

VISUALIZATION

The parties will [*] via [*], [*], [*] and [*]. The [*] CHM [*] and [*] will be
[*] and [*] to [*] for usage at [*] as part of the CHM. [*] will [*] the [*] of
this [*] on [*] and [*] at [*] on [*] as part of the CHM.

OVERALL CHM PROCESS - [*]

In addition, an [*] which [*] the [*], [*] and [*] for [*] and [*] the [*] and
to [*] of the [*]) will be [*] and [*] to [*] so that [*] can implement
necessary [*] within [*] on [*] a part of the CHM.

INFORMATION EXCHANGE DURING THE RESEARCH TERM

In the course of the [*], a [*] of [*] will need to be [*]. The [*] of the [*],
[*], the [*] and of the [*], the [*] and the [*], will be [*] at [*]. [*] will
require [*] to the [*].

[*] will be [*] as [*], [*] and [*] for [*] in [*]. The [*] will be

* Certain information on this page has been omitted and filed separately with
  the Commission. Confidential treatment has been requested with respect to the
  omitted portions.

                                      -2-

<PAGE>

AZ AND CK CONFIDENTIAL

provided for use with [*]. [*] is responsible for acquiring its own [*].

[*]

[*]

ACCESS TO [*] EMPLOYED DURING THE RESEARCH TERM OF THE COLLABORATION

[*]

[*]

THE CYTOMETRIX(TM) HEPATOTOXICITY MODULE: [*] DELIVERED TO AZ FOR IDENTIFICATION
OF HEPATOTOXICITY IN [*] DURING THE [*]

[*] of the [*], [*], [*], [*] and [*] for the overall [*] and the [*] will be
delivered to [*] during the [*]. [*] will be [*] on the [*] and [*] of the CHM
per the [*].

[*] and [*] with [*] for [*], [*] and [*] will be delivered. The [*] will
constitute the [*] of the Cytometrix(TM) Hepatotoxicity Module, from [*] to [*]
of a [*]. [*] on the [*] and [*] will be provided.

[*]

[*]

[*]

[*]

[*]

* Certain information on this page has been omitted and filed separately with
  the Commission. Confidential treatment has been requested with respect to the
  omitted portions.

                                      -3-
<PAGE>

AZ AND CK CONFIDENTIAL

[*]

THIRD PARTY PRODUCTS INCLUDED IN THE DELIVERABLES

[*]

INFORMATION EXCHANGE

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

ALGORITHMS USED AS PART OF THE RESEARCH PLAN

[*]
[*]

[*]

[*]

CYTOMETRIX(TM) HEPATOTOXICITY MODULE

Hardware systems:

All computers are to be Intel(R) Pentium(R) series, operating systems are to be
Microsoft(R) Windows(R) 2000 or above.
(Memory, processor requirements TBD)

Applications Software:

[*]

[*]

[*]

[*]

[*]

* Certain information on this page has been omitted and filed separately with
  the Commission. Confidential treatment has been requested with respect to the
  omitted portions.

                                       -4-
<PAGE>

AZ AND CK CONFIDENTIAL

[*]

[*]

[*]

[*]

*    Certain information on this page has been omitted and filed separately with
     the Commission. Confidential treatment has been requested with respect to
     the omitted portions.

                                      -5-
<PAGE>

AZ AND CK CONFIDENTIAL

                                  EXHIBIT 1.25

                                EXEMPT ACTIVITIES

AZ: With respect to AZ, Exempt Activities means the:

[*]

[*]

CK: With respect to CK, Exempt Activities means the:

[*]

[*]

* Certain information on this page has been omitted and filed separately with
  the Commission. Confidential treatment has been requested with respect to the
  omitted portions.

<PAGE>
AZ AND CK CONFIDENTIAL

                                  EXHIBIT 1.36

                              PERFORMANCE CRITERIA

[*]

[*]

[*]

[*]

[*]

*Certain information on this page has been omitted and filed separately with the
 Commission. Confidential treatment has been requested with respect to the
 omitted portions.

<PAGE>

AZ AND CK CONFIDENTIAL

                                  EXHIBIT 1.45

                                  RESEARCH PLAN

                                REVISION HISTORY

<TABLE>
<S>                  <C>           <C>                <C>
[*]                  [*]           First Draft        2 pages
Cytokinetics

[*]                  [*]           Version 1.0
AstraZeneca

[*]                  [*]           Version 1.7
AstraZeneca

[*]                  [*]           Version 1.8
Cytokinetics

[*]                  [*]           Version 1.9
Cytokinetics

[*]                  [*]           Version 2.0
Cytokinetics

WSGSR                [*]           Version 2.1        Editing and consistency
                                                      with main body of
                                                      Agreement
</TABLE>

*Certain information on this page has been omitted and filed separately with the
 Commission. Confidential treatment has been requested with respect to the
 omitted portions.

<PAGE>

AZ AND CK CONFIDENTIAL

                                TABLE OF CONTENTS

<TABLE>
<S>                                                      <C>
1.       Introduction                                    1

         1.1    Discovery Problems                       1

         1.2    Approach                                 1

         1.3    Project Aims                             2

2        Project Organisation                            2

         2.1    Roles and Responsibilities               2

         2.2    Meetings Plan                            2

         2.3    Communication Formats                    2

3.       Respective Contributions                        3

4.       Project Plan                                    7

         4.1    Project Phases                           7

         4.2    Collaboration Deliverables               9
</TABLE>

                                      -i-

<PAGE>

AZ AND CK CONFIDENTIAL

ARTICLE I         INTRODUCTION

1.1      DISCOVERY PROBLEMS

Section 1.01 Candidate Drugs (CDs) that fail to make it to market are both
common and expensive. It has been estimated that that less than 10% of CDs
result in a marketable product with each late stage failure incurring
significant costs. Approximately 50% of these failures can be attributed to
toxicological problems. There will be a greater need for early stage profiling
in the future as high throughput screening increases the number of active
compounds per target. Clearly, improved early stage toxicity profiling will aid
the selection of CDs less likely to fail in the development phase and allow a
more informed decision about which active compounds should be progressed.

1.2      APPROACH

Section 1.02 [*]

Section 1.03 [*]

Section 1.04 [*]

*Certain information on this page has been omitted and filed separately with the
 Commission. Confidential treatment has been requested with respect to the
 omitted portions.

<PAGE>

AZ AND CK CONFIDENTIAL

1.3      PROJECT AIMS

The project aim is to utilise the expertise and knowledge within both companies
to develop a high content biology platform for hepatotoxicity profiling of
compounds. At the end of the collaboration the platform would be available for
use in both companies in their own R&D programmes.

To share between AZ and CK [*] and AZ proprietary toxicological data.

[*]

ARTICLE II        PROJECT ORGANISATION

2.1      ROLES AND RESPONSIBILITIES - TO BE APPOINTED

2.2      MEETINGS PLAN

         Weekly telephone conference calls/NetMeeting will be held between AZ &
         CK scientists to discuss detailed scientific progress and issues.

         Monthly video conference calls of project management team

         Quarterly visits, alternating between AZ and CK will be held.

         All meetings are to be scheduled at the outset of each project phase,
         agendas to be circulated at least 2 days before weekly meetings, and 1
         week before monthly and quarterly.

2.3      COMMUNICATION FORMATS

         All documents will follow the defined project format (attach templates)
         in MS Word for Windows v2000 or MS PowerPoint for Windows v2000. Up to
         date project plan will be available to all parties in MS Project for
         Windows v2000. MS Project will be used for GANT charts.

* Certain information on this page has been omitted and filed separately with
  the Commission. Confidential treatment has been requested with respect to the
  omitted portions.

                                      -2-

<PAGE>

AZ AND CK CONFIDENTIAL

ARTICLE III       RESPECTIVE CONTRIBUTIONS

         FTE commitments are man-years for the complete lifetime of the project
- nominally [*] months.

<TABLE>
<CAPTION>
                           AZ                                   CK
------------------------------------------------------------------------------------------------
<S>                        <C>                                  <C>
[*]                           [*] FTE                              [*] FTE
----------------------------------------------------------
[*]                           [*]                                  [*]

                              [*]                                  [*]

                              [*]                                  [*]

                              [*]

                              [*]
----------------------------------------------------------
[*]                           [*]                                  [*]

                              [*]                                  [*]
------------------------------------------------------------------------------------------------
[*]                           [*]
------------------------------------------------------------------------------------------------
</TABLE>

* Certain information on this page has been omitted and filed separately with
  the Commission. Confidential treatment has been requested with respect to the
  omitted portions.

                                      -3-

<PAGE>

AZ AND CK CONFIDENTIAL

<TABLE>
<S>                        <C>                                  <C>
[*]                        [*] FTE                              [*] FTE

                           [*]                                  [*]

                           [*]

                               [*]

                               [*]

                               [*]

                               [*]

                               [*]

                               [*]

                               [*]
------------------------------------------------------------------------------------------------
[*]                        [*] FTE

                           [*]

------------------------------------------------------------------------------------------------
[*]                        [*] FTE                              [*] FTE

                           [*]                                  [*]

                                                                [*]
------------------------------------------------------------------------------------------------
</TABLE>

* Certain information on this page has been omitted and filed separately with
  the Commission. Confidential treatment has been requested with respect to the
  omitted portions.

                                    -4-

<PAGE>

AZ AND CK CONFIDENTIAL

<TABLE>
<S>                        <C>                                  <C>
[*]                        [*]FTE                               [*]FTE
                           [*]                                  [*]
                           [*]                                  [*]
                                                                [*]
------------------------------------------------------------------------------------------------
[*]                                                             [*]FTE
                                                                [*]
-----------------------------------------------------------------------------------------------
[*]                        [*]FTE                               [*]FTE
                           [*]                                  [*]
                                                                [*]
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[*]                        [*]FTE                               [*]FTE
                           [*]                                  [*]
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                                                                [*]
                                                                [*]
                                                                [*]
------------------------------------------------------------------------------------------------
</TABLE>

* Certain information on this page has been omitted and filed separately with
  the Commission. Confidential treatment has been requested with respect to the
  omitted portions.

                                       -5-

<PAGE>

AZ AND CK CONFIDENTIAL

<TABLE>
<S>                       <C>                                   <C>
     [*]                                                        [*] FTE
                                                                [*]

------------------------------------------------------------------------------------------------
     [*]                  [*] FTE                               [*] FTE
                          [*]                                   [*]
                          [*]                                   [*]
                          [*]

------------------------------------------------------------------------------------------------
     [*]                  [*] FTE                               [*] FTE
                          [*]                                   [*]
                          [*]
                          [*]
                          [*]
                          [*]
                          [*]

------------------------------------------------------------------------------------------------
     [*]                  [*] FTE [*]                            [*] FTE [*]
                          [*]
                          [*]

------------------------------------------------------------------------------------------------
</TABLE>

* Certain information on this page has been omitted and filed separately with
  the Commission. Confidential treatment has been requested with respect to
  the omitted portions.

                                       -6-

<PAGE>

AZ AND CK CONFIDENTIAL

ARTICLE IV        PROJECT PLAN

4.1      PROJECT PHASES
         [*]

         [*]

         [*]

         [*]

         [*]

         [*]

         [*]

         [*]

         [*]

         [*]

         [*]

         [*]

         [*]

         [*]

         [*]

         [*]

         [*]

* Certain information on this page has been omitted and filed separately with
  the Commission. Confidential treatment has been requested with respect to
  the omitted portions.

                                      -7-

<PAGE>

AZ AND CK CONFIDENTIAL

[*]

[*]

[*]

[*]

[*]

[*]

[*]

[*]

[*]

[*]

[*]

[*]

[*]

[*]

[*]

[*]

*    Certain information on this page has been omitted and filed separately with
     the Commission. Confidential treatment has been requested with respect to
     the omitted portions.

                                      -8-

<PAGE>

AZ AND CK CONFIDENTIAL

4.2      DELIVERABLES FOR RESEARCH PROGRAM:

         The Deliverables for the Research Program are defined in Exhibit 1.23
of the Agreement.

                                      -9-

<PAGE>

AZ AND CK CONFIDENTIAL

                                  EXHIBIT 5.6.2

                                     SUPPORT

DURING THE [*] WILL:

-    Perform installation of the [*] at [*]. Given prior preparation, by [*], of
     the required [*] on the [*] at a [*] this effort is estimated to take [*]
     to complete.

-    Supply [*] with a [*] and [*] for its own use in the event of [*] during
     the [*].

-    Train [*] on [*].

-    Supply [*] with [*] for the [*] as defined in Deliverables Exhibit 1.23.

-    Prepare [*] as necessary and [*] to [*] with [*].

IN THE EVENT OF [*], WHETHER DURING THE [*] OR [*], [*] WILL:

-    Expect that [*] will [*] from the [*] and [*] supplied by [*] during the
     [*] at [*].

-    Answer [*] via phone, video conference or email regarding [*] or [*] to [*]
     of the CHM.

-    In the event, that the [*] do not result in a [*] at [*], [*] will on a
     [*], [*] to the [*] and [*] a [*] of the CHM.

* Certain information on this page has been omitted and filed separately with
  the Commission. Confidential treatment has been requested with respect to the
  omitted portions.
<PAGE>

                                   EXHIBIT 7.4

<TABLE>
<S>                                                                                <C>
Contacts:

CYTOKINETICS, INC.                                                                 ASTRAZENECA (MEDIA ENQUIRES)
Robert I. Blum                                                                     Steve Brown, +44 (0) 207 304 5033
SVP, Finance and Corporate Development, and CFO                                    Scott Young, +1.781.839.4589
(650) 624-3000                                                                     Kellie Rivest, +1.781.839.4151

BURNS MCCLELLAN, INC.
E. Blair Clark (investors) or Justin Jackson (media)
(212) 213-0006
</TABLE>

FOR IMMEDIATE RELEASE

                      CYTOKINETICS AND ASTRAZENECA ANNOUNCE
       TECHNOLOGY DEVELOPMENT COLLABORATION FOCUSED ON PREDICTIVE TOXICITY

       ALLIANCE LEVERAGES CYTOMETRIX(TM) CELLULAR PHENOTYPING TECHNOLOGIES

SOUTH SAN FRANCISCO, CA AND LONDON, UK, DEC. 18, 2003 - Cytokinetics, Inc., and
AstraZeneca Pharmaceuticals announced today that the two companies have entered
into an exclusive collaboration to develop automated imaging-based cellular
phenotyping and analysis technologies for the in vitro prediction of
hepatotoxicity. The companies have agreed to commit internal resources and
combine efforts aimed at addressing an important inflection point in the
pharmaceutical discovery and development process. Under the terms of the
agreement, AstraZeneca will fund technology development activities at
Cytokinetics over a two-year research term. The agreement further provides for a
milestone payment and annual licensing fees to be paid to Cytokinetics upon the
Cytometrix(TM) Hepatotoxicity Module successfully achieving certain agreed upon
performance criteria.

"Under this collaboration, we have the potential to develop new technologies
that may systematically and reliably predict toxic and non-toxic
pharmacophores," stated Jay Trautman, Ph.D., Cytokinetics' Vice President of
Technology. "AstraZeneca has decades of molecular toxicology and pathology
experience. By combining this expertise with Cytokinetics' validated cellular
phenotyping technologies, we have an opportunity to together bring forward an
application module of the Cytometrix(TM) technologies that may deliver
productivity gains for each of our later stage discovery and pre-clinical
development processes."

AstraZeneca's Vice President and Global Head of Safety Assessment, Peter
Moldeus, Ph.D., stated, "Complications associated with toxicity are a major
challenge for the pharmaceutical industry, as these toxicities often result in a
project's failure after substantial investments have already been made.
Diminishing the risks associated with toxicity by identifying a compound's
off-target liabilities earlier could significantly increase our development
success. We believe that Cytokinetics' Cytometrix(TM) cellular phenotyping
technologies have potential to help AstraZeneca remain at the forefront of
research in this area."

CYTOMETRIX(TM) TECHNOLOGIES

The collaboration will leverage Cytokinetics' proprietary platform,
Cytometrix(TM) cellular phenotyping technologies, which are routinely utilized
in Cytokinetics' screening processes to analyze both on-target and off-target
effects of candidate compounds. Cytometrix(TM) cellular phenotyping technologies
utilize cell-based assays to create digital phenotypic profiles ("fingerprints")
representative of diverse molecular mechanisms of drug action. Cytometrix(TM)
fingerprints detail information on the potency and specificity of a compound or
drug-related toxicities. Cytokinetics presently employs Cytometrix(TM) cellular
phenotyping technologies to eliminate compounds of mixed mechanism, allowing the
company to focus its medicinal chemistry and pharmacology resources more
selectively on higher quality chemical series. This collaboration with
AstraZeneca is designed to develop a new Cytometrix(TM) technologies application
called the Cytometrix(TM) Hepatotoxicity Module for the in vitro prediction of
hepatotoxicities downstream of screening.

                                    - more -

<PAGE>

Cytokinetics and AstraZeneca Collaboration Press Announcement
December 18, 2003
Page 2

ABOUT CYTOKINETICS

Founded in 1998 and privately held, Cytokinetics is dedicated to the discovery,
development and commercialization of a novel class of therapeutics resulting
from its leadership position in the emerging field of cytoskeletal pharmacology.
The cytoskeleton is a complex, dynamic framework that impacts all aspects of
cell function including cell division, cell motility, intracellular transport,
muscle contractility and regulation of cellular organization. Cytokinetics' R&D
efforts aim to address pharmaceutical needs in cancer, cardiovascular and
infectious diseases and feature proprietary Cytometrix(TM) cellular phenotyping
technologies designed to industrialize cell biology for increased speed and
productivity in drug discovery and development. Cytokinetics and GlaxoSmithKline
have entered into a broad strategic collaboration to discover, develop and
commercialize novel small molecule therapeutics targeting mitotic kinesins for
applications in the treatment of cancer and other diseases. Cytokinetics and
GlaxoSmithKline are conducting Phase I studies with the first novel anti-cancer
drug candidate emerging from the collaboration and intend to expand clinical
development upon completion of these studies. Additional information about
Cytokinetics can be obtained at www.cytokinetics.com.

ABOUT ASTRAZENECA

AstraZeneca is a major international healthcare business engaged in the
research, development, manufacture and marketing of prescription pharmaceuticals
and the supply of healthcare services. It is one of the top five pharmaceutical
companies in the world with healthcare sales of over $17.8 billion and leading
positions in sales of gastrointestinal, oncology, cardiovascular, neuroscience
and respiratory products. AstraZeneca is listed in the Dow Jones Sustainability
Index (Global and European) as well as the FTSE4Good Index. Worldwide,
AstraZeneca has six major research and development sites and four discovery
sites employing more then 11,000 people in six countries including Canada,
France, India, Sweden, United Kingdom and the United States. For more
information, please visit www.astrazeneca.com/research.

                                      # # #

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