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                                                                   Exhibit 10.10

                  COLLABORATIVE RESEARCH AND DEVELOPMENT AGREEMENT

     This Agreement is entered into as of December     , 1997 (the "Effective
Date"), by and between NEUROCRINE BIOSCIENCES INC., a Delaware corporation
having an office at 3050 Science Park Road, San Diego, California 92121
("Neurocrine"), and RIGEL, INC., a Delaware corporation having an office at
772 Lucerne Drive, Sunnyvale, California 94086 ("Rigel").

                                       RECITALS

     WHEREAS, Neurocrine has an active research program in the area of
neurodegeneration and has developed a substantial compound library and drug
screening and medicinal chemistry capabilities;

     WHEREAS, Rigel has certain intellectual property and expertise
pertaining to the discovery, and identification of molecular targets
associated with signal transduction pathways; and

     WHEREAS, Neurocrine and Rigel desire to establish a collaboration for
the discovery, development and commercialization of (a) novel protein targets
involved in glial cell and macrophage activation, and (b) small molecule
inhibitors of protein:protein interactions involving proteins other than
those involved in glial cell activation (the "Collaboration"), and to reflect
their mutual understanding within this definitive Collaborative Research and
Development Agreement (the "Collaboration Agreement" or the "Agreement");

     NOW, THEREFORE, in consideration of the foregoing and the covenants and
promises contained in this Collaborative Agreement, the parties agree as
follows:

                                     AGREEMENT

I.   DEFINITIONS

     1.1   "AFFILIATE" means, as to a party to this Agreement, any
corporation, company, partnership, joint venture or other entity which
controls, is controlled by, or is under common control with, such party. For
purposes of this Section 1.1, control shall mean (without limitation) in the
case of corporate entities, the direct or indirect ownership of at least
fifty percent (50%) of the stock or participating shares entitled to vote for
the election of directors.

     1.2   "ANNUAL RESEARCH PLAN" means a plan approved by the Steering
Committee detailing the scope, level and extent of the Research and
Development, the specific technical and scientific responsibilities of each
party for each party for each one-year period during the Research and
Development Period, as described in Section 3.2.

     1.3   "COLLABORATION PRODUCTS" means collectively, Rigel Collaboration
Products and Neurocrine Collaboration Products.

                                      1.

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     1.4    "CONFIDENTIAL INFORMATION" means any proprietary information,
including the Neurocrine Technology and Rigel Technology, and any other
information relating to any research project, work in process, future
development, scientific, manufacturing, marketing, business plan, financial
or personnel matter relating to either party, its present or future products,
sales, suppliers, customers, employees, investors or business that one party
discloses to the other party during the term of this Agreement, whether in
oral, written, graphic or electronic form.

     1.5   "DEVELOPMENT MOLECULES" means any small molecule included in the
Neurocrine library or produced in the course of Neurocrine's performance of
medicinal chemistry on a small molecule included in the Neurocrine Chemical
Library pursuant to Section 2.3, which small molecule is screened against a
Rigel Target and is determined by the Research Committee to have an EC(50) of
less than 1 uM against such target. Development Molecules exclude Peptide
Antagonists.

     1.6   "EUROPE" shall mean the United Kingdom, Germany, France, Italy,
Spain and Switzerland.

     1.7   "JOINT TECHNOLOGY" means any and all discoveries, modifications,
improvements, know-how, trade secrets, inventions (whether or not
patentable), patent applications and patents (including, without limitation,
all substitutions, divisionals, reissues, reexaminations, continuations,
continuations-in-part and inventors' certificates and all foreign
counterparts of the foregoing), data, information or physical, chemical or
biological material useful or necessary to the development or
commercialization of Collaboration Products that is developed by Neurocrine
and Rigel jointly during the term of this Agreement as a result of Research
and Development under the Annual Research Plan. Ownership of Joint Technology
shall be determined in accordance with Article 6.

     1.8   "MAJOR COUNTRIES" means the United States, Europe, Japan and Canada.

     1.9   "NEUROCRINE CHEMICAL LIBRARY" means the library of chemical
compounds that Neurocrine owns or controls during the Research and
Development Period. For the purposes of this Agreement, the Neurocrine
Chemical Library shall be assumed to be approximately one hundred thousand
(100,000) compounds during the first year of the Collaboration, and
approximately one hundred twenty-five thousand (125,000) compounds during the
second year of the Collaboration, and shall be deemed to exclude any
compounds that Neurocrine has licensed to a third party prior to the
Effective Date and any compounds that Neurocrine is precluded from providing
to Rigel under this Agreement by reason of contractual or other proprietary
flights of a third party.

     1.10  "NEUROCRINE COLLABORATION PRODUCTS" means any product
incorporating or discovered utilizing a Protein Target or a Peptide
Antagonist.

     1.11  "NEUROCRINE TECHNOLOGY" means any and all discoveries,
modifications, improvements, know-how, trade secrets, inventions (whether
or not patentable), patent

                                      2.

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applications and patents (including, without limitation, all substitutions,
divisionals, reissues, reexaminations, continuations, continuations-in-part
and inventors' certificates and all foreign counterparts of the foregoing),
data, information or physical, chemical or biological material useful or
necessary to the development or commercialization of Collaboration Products
that is owned or licensed (with a right to sublicense) by Neurocrine as of
the Effective Date or solely made or developed by Neurocrine during the
Research and Development of Collaboration Products pursuant to this Agreement.

     1.12  "PROTEIN TARGET" means an enzyme, receptor, transducer or
transcription factor or other molecule identified during the performance of
the Research and Development that the Research Committee determines, based
upon data generated during the Research and Development, is a molecule
primarily involved in glial cell activation. Protein Targets shall exclude
Rigel Targets.

     1.13  "PARTY" means Neurocrine or Rigel or their respective Affiliates.

     1.14  "PEPTIDE ANTAGONISTS" means peptides identified or produced by
Rigel pursuant to Section 2 that the Research Committee determines, based upon
data generated during the Research and Development, to have activity against
one or more Protein Targets. Peptide Antagonists exclude Development Molecules.

     1.15  "RESEARCH AND DEVELOPMENT" means the collaborative activities
conducted by the parties during the Research and Development Period pursuant
to this Agreement targeted toward the generation, identification, production
and characterization of Rigel Targets, Protein Targets, Peptide Antagonists
and Development Molecules.

     1.16  "RESEARCH AND DEVELOPMENT PERIOD" means the period commencing upon
the Effective Date and terminating upon the second anniversary of the Effective
Date, during which period the parties shall conduct Research and Development.
The parties may extend the Research and Development Period for additional one
(1) year periods upon mutually acceptable terms.

     1.17  "RIGEL COLLABORATION PRODUCTS" means any product incorporating or
discovered utilizing Rigel Target or a Development Molecule.

     1.18  "RIGEL TARGET" means an enzyme, receptor, transducer, transcription
factor or other molecule that the Research Committee determines, based upon
data generated during the Research and Development, is specifically associated
primarily with processes other than glial cell activation. Rigel Targets
exclude Protein Targets.

     1.19  "RIGEL TECHNOLOGY" means any and all discoveries, modifications,
improvements, know-how, trade secrets, inventions (whether or not patentable),
patent applications and patents (including, without limitation, all
substitutions, divisionals, reissues, reexaminations, continuations,
continuations-in-part and inventors' certificates and all foreign

                                      3.

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counterparts of the foregoing), data, information or physical, chemical or
biological material useful or necessary to the development or commercialization
of Collaboration Products that is owned or licensed (with a right to sublicense)
by Rigel as of the Effective Date or solely made or developed by Rigel during
the Research and Development of Collaboration Products performed pursuant to
this Agreement.

     1.20  "STEERING COMMITTEE" means the committee established under Section 3
of this Agreement.

2.   RESEARCH AND DEVELOPMENT COLLABORATION

     2.1   OVERVIEW. The primary purpose of the Collaboration is to conduct
Research and Development toward the discovery and development of Collaboration
Products in accordance with the Annual Research Plan. To that end, it is
contemplated by the parties that:

           (a)  Neurocrine will have primary responsibility for supplying
certain cell lines necessary for the study of glial cell activation, providing
small molecule compounds from the Neurocrine Chemical Library, performing
limited medicinal chemistry as required by the Annual Research Plan, and
conducting certain screening and secondary assays and screening compounds from
the Neurocrine Chemical Library against Rigel Targets;

           (b)  Neurocrine and Rigel will share responsibility for applying the
Rigel Technology to develop an appropriate glial cell assay system to identify
Protein Targets and Peptide Antagonists; and

           (c)  Rigel will have primary responsibility for identifying and
providing Protein Targets, identifying and sequencing gene(s) coding for the
Protein Targets, and generating, identifying and providing Peptide Antagonists
of such Protein Targets. Rigel will also have responsibility for providing
Rigel Targets to Neurocrine for screening purposes. It is understood that the
individual and joint responsibilities will be set forth in detail in the Annual
Research Plan to be developed pursuant to Section 3.2.

     2.2   IDENTIFICATION AND TRANSFER OF PROTEIN TARGETS. The parties shall
use diligent efforts to identify and transfer to Neurocrine one or more
"primary" Protein Targets that the Research Committee determines, based upon
the activity of such target in glial cell function assays performed during the
Research and Development, to be the best targets against which to screen small
molecules for activity. To this end, within the first year of the
Collaboration, Rigel shall use diligent efforts to identify and provide to
Neurocrine at least six (6) Protein Targets, the genes encoding those Protein
Targets, and Peptide Antagonists active against such Protein Targets, unless
the Steering Committee otherwise provides in the Annual Research Plan. In the
event that Rigel is unable, using such diligent efforts, to provide the Protein
Targets, genes encoding the Protein Targets and/or Peptide Antagonists within
the first year of the Collaboration, Rigel shall continue to use diligent
efforts to provide such biological materials as soon as possible thereafter.

                                      4.

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     2.3   TRANSFER OF DEVELOPMENT MOLECULE TECHNOLOGY.

           (a)  Within the first year of the Collaboration, Rigel may provide
to Neurocrine a maximum of three (3) Rigel Targets that Neurocrine shall screen
against the Neurocrine Chemical Library. Similarly, during the second year of
the Collaboration, Rigel may provide to Neurocrine a maximum of another
three (3) Rigel Targets for the purposes of screening against the Neurocrine
Chemical Library. In no instance shall Neurocrine be obligated to screen a Rigel
Target that it believes in good faith to be in direct competition with a
Neurocrine research and development program existing at the time of the request.
All Rigel Targets shall be formatted in 96-well plates in an assay suitable for
high throughput screening. Within six (6) months of receipt of a Rigel Target,
Neurocrine shall screen such Rigel Targets as directed by the Research
Committee and provide Rigel with the results of such screen. In the event Rigel
provides more than two Rigel Targets to Neurocrine in any sixty (60) day period,
Neurocrine shall have the right to extend the time period within which it must
provide the results of the screen by an additional sixty (60) days.

           (b)  Based upon the results of the foregoing screening activities,
Rigel may select one (1) Rigel Target in each of the two years of the
Research and Development Period. During the second year of the Collaboration,
Neurocrine shall devote one full-time equivalent (FTE) for the purpose of
performing medicinal chemistry on molecules in the Neurocrine Chemical
Library that the Research Committee determines are active against the Rigel
Target and most suitable for structure-activity relationship development, and
perform additional appropriate screening to provide Rigel with a Development
Molecule prior to expiration of the Research and Development Period. Once a
Development Molecule has been identified, Neurocrine shall no longer be
obligated to expend any additional effort or resources on such Rigel Target
or Development Molecule. In the event that Neurocrine, in its discretion,
determines that it is unable to devote the services of one full-time
equivalent (FTE) to such medicinal chemistry activities during the second
year of the Collaboration, Neurocrine may elect to provide Rigel with a
portion of the Neurocrine Chemical Library (hereinafter the "Sample Library")
in lieu of the performance of such services. The Sample Library shall consist
of approximately one hundred microliters (100 uL) of a ten millimolar (10mM)
stock solution of any compound then existing in the Neurocrine Chemical
Library, for which Neurocrine has in its possession a quantity of at least 2
milligrams, on a compound-by-compound basis. The Sample Library shall also
include any structural information Neurocrine has in its possession with
regard to the transferred compounds. At the end of the second year of the
Collaboration (or earlier as provided above), Neurocrine shall provide to
Rigel the Sample Library to allow Rigel to conduct internal screening
activities, excluding the screening of any targets which Neurocrine is, or
reasonably anticipates, itself screening, as determined at the time of
transfer. For purposes of clarity, at the time of transfer Neurocrine shall
provide Rigel with a list of the targets as to which screening of the Sample
Library is prohibited.

     2.4   CONDUCT OF RESEARCH AND DEVELOPMENT. The parties will conduct their
respective Research and Development activities under the Annual Research Plan
in good

                                      5.

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scientific manner and in compliance with all applicable governmental,
regulatory and legal requirements. Neurocrine and Rigel will each use their
good faith scientific and business judgment to allocate sufficient time,
effort, equipment and facilities to. the Collaboration to achieve the
objectives of the Collaboration consistent with the terms of this Agreement
and the recommendations of the Steering Committee, as provided in Section 3
below.

     2.5   VISIT OF FACILITIES. Representatives of either party may, upon
reasonable notice and at a frequency reasonably acceptable to the Other party
during normal business hours (a) visit the facilities where the Research and
Development is being conducted; and (b) consult informally, during such visits
and by telephone, with personnel of the other party performing the Research
and Development. Each party shall bear its own expenses with regard to any such
visits. If requested by the other party, Neurocrine and Rigel shall cause
appropriate individuals working on the Research and Development to be available
for meetings at the location of the facilities where such individuals are
employed at times reasonably convenient to each party.

     2.6   DISCLOSURE OF DATA. The parties will promptly provide to each
other all data generated during the Research and Development, including,
without limitation, all Neurocrine Technology, Joint Technology and Rigel
Technology arising during the Research and Development Period.

3.   STEERING COMMITTEE

     3.1   FORMATION. The parties will promptly after the Effective Date form a
Steering Committee having six members, with an equal number of representatives
from each of Neurocrine and Rigel. Each party may replace its respective
representatives on the Steering Committee from time to time upon written notice
to the other party.

     3.2   MEETING AND RESPONSIBILITIES.

           (a)  Within ninety (90) days from execution of this Agreement, the
Steering Committee shall formulate and approve an Annual Research Plan which
shall guide each party's activities through December 31, 1998. The Steering
Committee will meet regularly during the Research and Development Period to:
(i) set objectives for the Research and Development; (ii) assess the level
and extent of the Research and Development activities to be conducted by each
party; (iii) review the progress of the Research and Development; (iv) oversee
patent matters relating to Joint Technology and any Rigel Technology or
Neurocrine Technology to be assigned pursuant to Section 6.3; (v) ensure that
the designation of all Rigel Targets, Protein Targets, Peptide Antagonists and
Development Molecules is documented and is consistent with the definitions
provided herein, and resolve any disputes regarding such designations;
(vi) oversee the extent and timing of any technology transfer necessary or
appropriate for the Research and

                                      6.

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Development; and (vii) encourage and facilitate ongoing cooperation between
the parties. Meetings of the Steering Committee will take place at mutually
agreed upon times and locations. From time to time, the Steering Committee
may establish subcommittees (including a Research Committee responsible for
directing the parties' day to day Research and Development activities) to
oversee particular projects or activities, and such additional subcommittees
shall be staffed as designated by the Steering Committee.

           (b)  By September 1, 1998, Neurocrine and Rigel shall submit to one
another their respective proposals concerning the Research and Development to
be conducted during the next calendar year. Thereafter, Neurocrine and. Rigel
shall jointly prepare proposed revisions to the draft Annual Research Plan for
submission to the Steering Committee for approval. The Steering Committee shall
review the proposal as soon as possible after receipt, and shall establish and
approve a final Annual Research Plan for the following calendar year prior to
or on November 15, 1998. The Steering Committee may amend the Annual Research
Plan from time to time as it deems necessary or appropriate. The parties shall
alternate the responsibility of preparing and distributing the minutes of such
Steering Committee meetings, with Neurocrine preparing the minutes of the first
meeting. All such meeting minutes should, whenever possible, be distributed to
the parties within twenty-one (21) days from the date of the meeting, and
should include any changes to the Annual Research Plan, and a summary of any
inventions, discoveries or results achieved under this Agreement which should
be deemed to be Joint Technology. If necessary or desired, each party may
consult with its respective patent counsel prior to rendering any such
designation of results as Joint Technology. The Steering Committee shall
attempt to resolve any disagreements regarding whether a given technology
should be designated as Joint Technology, Rigel Technology or Neurocrine
Technology pursuant to Section 6.6.

     3.3   DISAGREEMENTS. Decisions of the Steering Committee shall be by a
majority vote. If no majority vote is obtained with respect to any issue, the
matter will be referred to the Chief Executive Officer of each party or such
other senior executive designated by a party who is reasonably acceptable to
the other party and who has decision-making authority. Such persons shall
meet and attempt to resolve the matter in good faith. Any disputes that remain
unresolved by such executives shall be submitted for resolution as provided in
Section 9.3.

4.   COLLABORATION FUNDING

     4.1   RESEARCH AND DEVELOPMENT FUNDING. Neurocrine and Rigel shall each
be responsible for their own costs associated with activities within the
Annual Research Plan.

                                      7.

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5.   LICENSES

     5.1   RESEARCH LICENSE TO RIGEL. Neurocrine hereby grams to Rigel a
non-exclusive, worldwide, royalty-free license, without the right to
sublicense, under Neurocrine's interest in the Neurocrine Technology, Joint
Technology and any Rigel Technology that may be assigned to Neurocrine
pursuant to Section 6.5, solely to the extent necessary or appropriate for
Rigel to conduct Research and Development of Collaboration Products pursuant
to this Agreement.

     5.2   RESEARCH LICENSE TO NEUROCRINE. Rigel hereby grants to Neurocrine
a non-exclusive, worldwide, royalty-free license, without the right to
sublicense, under Rigel's interest in the Rigel Technology, Joint Technology
and any Neurocrine Technology that may be assigned to Rigel pursuant to
Section 6.5, solely to the extent necessary or appropriate for Neurocrine to
conduct Research and Development of Collaboration Products pursuant to this
Agreement.

     5.3   COMMERCIALIZATION LICENSE TO NEUROCRINE. Rigel hereby grants to
Neurocrine an exclusive, worldwide, royalty free license, with the right to
sublicense, under Rigel's interest in any applicable intellectual property
rights within the Rigel Technology or the Joint Technology solely to develop,
make, use, sell, offer for sale and import Neurocrine Collaboration Products.

     5.4   COMMERCIALIZATION LICENSE TO RIGEL. Neurocrine hereby grants to
Rigel an exclusive, worldwide, royalty-free, license, with the right to
sublicense, under Neurocrine's interest in any applicable intellectual
property rights within the Neurocrine Technology or the Joint Technology
solely to develop, make, use, sell, offer for sale or import Rigel
Collaboration Products.

6.   PATENT MATTERS

     6.1   OWNERSHIP. Subject to Section 6.5, as determined in accordance with
the rules of inventorship under U.S. law, each party shall have sole ownership
of all inventions made solely by its employees or other agents during the term
of this Agreement, which inventions shall be Rigel Technology if made solely by
Rigel's employees or agents or Neurocrine Technology if made solely by
Neurocrine's employees or agents. The parties shall each own a fifty percent
(50%) undivided interest (without accounting) in all inventions made jointly by
the parties' employees or other agents, subject to any licenses granted
pursuant to this Agreement, which inventions shall be Joint Technology.
Specifically, Neurocrine shall have sole ownership and control of the Neurocrine
Technology, and Rigel shall have sole ownership and control of Rigel Technology,
subject to any licenses granted pursuant to this Agreement. The parties agree
that they each shall enter into agreements with their respective employees and
other agents providing

                                      8.

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that, to the maximum extent permitted by applicable law, such employees and
other agents shall assign (or be obligated to assign) to the party hereto
which acts as their employer or principal, the ownership and control of all
inventions conceived or reduced to practice by such employees and agents in
the course of their employment for, or within the scope of the agency
relationship with, each party hereto. Any disputes regarding the designation
of inventions as Neurocrine Technology, Rigel Technology or Joint Technology
shall be submitted for resolution by the Steering Committee.

     6.2   PROSECUTION OF PATENTS CONSTITUTING RIGEL TECHNOLOGY. Rigel shall
prepare, file, prosecute and maintain patent applications and/or patents
worldwide, in accordance with Section 6.6, for those inventions within the
Rigel Technology and any inventions assigned to Rigel pursuant to Section
6.5. Rigel shall use its best efforts, consistent with its own internal
filing procedures, to obtain letters patent on patentable Rigel Technology in
all Major Countries and, where possible and appropriate, worldwide.

     6.3   PROSECUTION OF PATENTS CONSTITUTING NEUROCRINE TECHNOLOGY AND
JOINT TECHNOLOGY. Neurocrine shall prepare, file, prosecute and maintain
patents and/or patent application worldwide, in accordance with Section 6.6,
for those inventions within the Neurocrine Technology and within the Joint
Technology and any inventions included in the Rigel Technology that are
assigned to Neurocrine pursuant to Section 6.5. Neurocrine shall use its best
efforts, consistent with its own internal filing procedures, to obtain
letters patent in all Major Countries and, where possible and appropriate,
worldwide.

     6.4   COOPERATION IN PATENT MATTERS. Consistent with Section 6.6 below,
the parties agree to cooperate with each other as necessary or appropriate in
the preparation, filing and prosecution of patent applications pursuant to
Sections 6.2, 6.3 and 6.5, including providing one another a reasonable
opportunity to review and comment on any patent application to be filed in
the U.S. or in any other country. All costs associated with the preparation,
filing, prosecution and maintenance of patent applications and patents
coveting jointly owned Joint Technology shall be shared equally by the
parties.

     6.5   TRANSFER OF CERTAIN PATENTS CONSTITUTING NEUROCRINE TECHNOLOGY,
RIGEL TECHNOLOGY OR JOINT TECHNOLOGY. Notwithstanding Sections 6.1 and 6.2,
Rigel shall assign its interest in any inventions included in the Rigel
Technology and any Joint Technology that is solely related to a Protein
Target or to a Peptide Antagonist to Neurocrine, and Neurocrine shall
thereafter prepare, file, prosecute and maintain patents and/or patent
applications worldwide for all such inventions, consistent with the
provisions of Section 6.3. Similarly, notwithstanding Sections 6.1 and 6.3,
Neurocrine shall assign its interest in any invention included in the
Neurocrine Technology and any Joint Technology that is solely related to a
Development Molecule or to a Rigel Target to Rigel, and Rigel shall
thereafter prepare, file, prosecute and maintain patents and/or patent
applications worldwide for all such inventions, consistent with the
provisions of Section 6.2.

                                      9.

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     6.6   DISCLOSURE OF INVENTIONS AND REVIEW OF PATENT APPLICATIONS. Each
party shall provide the other with a copy of a summary of any disclosure of an
invention (including those inventions included in the Joint Technology) arising
in the course of the Collaboration as soon as is reasonably practical after
such party recognizes such invention to allow the other party an opportunity to
comment upon the subject matter and upon the ownership and inventorship of the
invention. Subsequent to the provision of such a summary, designation of an
invention as Rigel Technology, Neurocrine Technology or Joint Technology, and
the determination of the ownership of such invention, the party responsible for
filing a patent application on such invention pursuant to Section 6 shall
provide the other party with a copy of any draft patent application directed
toward the invention in order. In addition, Neurocrine shall provide to Rigel a
copy of all amendments or substantive communications relating to jointly owned
Joint Technology sufficiently in advance of any relevant deadline or
anticipated submission date to allow Rigel a reasonable opportunity to evaluate
and comment upon any such application, amendment or substantive communication.

     6.7   ENFORCEMENT OF PATENTS BY A SINGLE PARTY. (a) Rigel shall have the
first right (but not the obligation) to enforce the patents included in the
Rigel Technology and any patents included in the Neurocrine Technology or Joint
Technology that are assigned to Rigel pursuant to section 6.4 against third
party infringement, and (b) Neurocrine shall have the first right (but not the
obligation) to enforce the patents included within the Neurocrine Technology or
Joint Technology (other than those patents included in the Joint Technology or
Neurocrine Technology that are assigned to Rigel pursuant to Section 6.5)
against third party infringement. In the event that the party with the first
right to enforce a patent pursuant to this Section 6.6 fails to commence
enforcement or otherwise terminates the alleged infringement within six months
after that party has learned of the alleged infringement, the other party shall
have the right, but not the obligation, to bring and control any such action
using counsel of its own choice and at its own expense.

     6.8   JOINT ENFORCEMENT OF PATENTS. If one party commences enforcement
proceedings pursuant to Section 6.6, the other party may elect upon written
notice to the enforcing party to join in the action in order to provide
reasonable assistance and to share in the costs and expenses associated with
the action. Any monetary awards recovered through the action shall first be
applied to fees and expenses, and the remainder shared pro rata based upon
the relative financial contribution of the parties to such fees and expenses.

     6.9   THIRD PARTY INFRINGEMENT ACTIONS. If a party receives notice of
any suit or claim alleging that the conduct of the activities within this
Agreement infringes the proprietary rights of a third party, the parties
shall promptly meet to discuss and decide on an appropriate response.

                                      10.

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7.   CONFIDENTIALITY

     7.1   CONFIDENTIALITY OBLIGATION. During the term of this Agreement and
for a period of five years thereafter, each party hereto shall maintain in
confidence all Confidential Information disclosed to it by the other party.
Neither party will use, disclose or grant the use of such Confidential
Information except as expressly authorized by this Agreement. To the extent
that disclosure is authorized by this Agreement, the disclosing party will
obtain prior agreement from its employees, agents, consultants or investigators
to whom disclosure is to be made to hold in confidence and not make use of such
information for any purpose other than those permitted by this Agreement. Each
party will use at least the same standard of care as it uses to protect its own
proprietary and trade secret information to ensure that such employees, agents,
consultants and investigators do not disclose or make any unauthorized use of
such Confidential Information. Each party will promptly notify the other upon
discovery of any unauthorized use or disclosure of the Confidential Information.

     7.2   EXCEPTIONS. The obligations of confidentiality contained in
Section 7.1 will not apply to the extent that it can be established by the
party receiving Confidential Information (the "Receiving Party") by competent
proof that such Confidential Information:

           (a)  was already known to the Receiving Party, other than under an
obligation of confidentiality with respect thereto, at the time of receipt from
the other party;

           (b)  was generally available to the public or otherwise part of the
public domain at the time of its receipt from the other party;

           (c)  becomes 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

           (d)  was received by the Receiving Party, other than under an
obligation of confidentiality, by a third party without breach of any
obligations of confidentiality with respect thereto.

     7.3   AUTHORIZED DISCLOSURE. Each party may disclose the Confidential
Information to the extent such disclosure is reasonably necessary in filing
or prosecuting patent applications, prosecuting or defending litigation, or
complying with applicable laws, governmental regulations, or court orders
provided that if such party is required to make any such disclosure of the
Confidential information it will to the extent practicable 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 all
reasonable efforts to secure confidential treatment of such information
required to be disclosed, subject to the limitations on disclosure set forth
in Section 7.4 (b).

     7.4  PUBLICATION.

                                      11.

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           (a)  During the term of this Agreement and for a period of five
(5) years thereafter, Neurocrine and Rigel each acknowledge the other party's
interest in publishing certain of its results to obtain recognition within the
scientific community and to advance the state of scientific knowledge. Each
party also recognizes the mutual interest in obtaining valid patent protection
and maintaining as confidential any Confidential Information or non-patentable
information which would have commercial value when undisclosed and maintained
as a trade secret. Consequently, if a party, its employees or consultants
desire to make a disclosure (including both written publications and oral
presentations made in the absence of a contractual obligation of
confidentiality) relating to work performed by such party (the "Publishing
Party") as part of the Research and Development, it shall transmit to the other
party (the "Reviewing Party") a copy of the proposed written publication at
least sixty (60) days prior to submission for publication, or an outline of
such oral presentation at least thirty (30) days prior to the anticipated date
of presentation. The Reviewing Party shall have the right (i) to propose
modifications to the publication or presentation to protect the patentability
of inventions, to maintain a trade secret or to protect other Confidential
Information of a party and (ii) to request a delay in publication or
presentation for a reasonable period of time as provided in Section 7.4(b) in
order to protect patentable information.

           (b)  If the Reviewing Party requests such a delay, the Publishing
Party shall delay the submission of the publication or the oral presentation
for a period of up to ninety (90) days to allow one or both parties to file
patent applications coveting information included in the publication or
presentation in accordance with Section 6. If the Reviewing Party reasonably
claims that such information, whether patentable or not, either is Confidential
Information of the Reviewing Party or may have significant commercial value and
can be maintained as a trade secret, the Publishing Party shall publish or
disclose only such information which would not adversely affect the
confidentiality of such Confidential Information or the commercial value of
such trade secret. Upon the expiration of sixty (60) or thirty (30) day review
period (as the case may be) set forth in Section 7.4(a), the Publishing Party
shall be free to proceed with the written publication or the presentation, as
applicable, unless the Reviewing Party has requested a further delay or a
modification described in this Section 7.4(b).

8.   TERM AND TERMINATION OF THE AGREEMENT

     8.1   TERM. Unless earlier terminated as provided below, the term of
this Agreement shall commence upon the Effective Date and terminate
concurrently With the termination of the Research and Development Period.

     8.2   TERMINATION.

           (a)  Each party will have the right to terminate this Agreement
(i) in the event of insolvency or bankruptcy of the other party, or (ii) after
written notice to the other that the

                                      12.

<PAGE>

other is in breach of any material term of this Agreement, unless the other
party cures such breach before the expiration of sixty (60) days from the
date of receipt of such notice.

           (b)  Either party may elect to terminate this Agreement during the
Research and Development Period prior to its expiration pursuant to Section
8.1 by providing to the other ninety (90) days written notice. In the event
that the Agreement is terminated prior to the second anniversary of the Research
and Development Period, the parties will meet and determine in good faith the
identity and disposition of all intellectual property rights and biological and
chemical materials generated up until the time of termination in accordance with
Section 6; provided, however, that the parties will negotiate in good faith the
disposition of any intellectual property rights and biological and chemical
materials that are not covered by the provisions of Section 6. Expiration or
termination of this Agreement shall not relieve the parties of any obligation
accruing prior to such expiration or termination.

     8.3   EFFECTS OF EXPIRATION OR TERMINATION OF THE RESEARCH AND
DEVELOPMENT PERIOD. Upon expiration of the Research and Development Period or
any termination of this Agreement prior to the expiration of the Research and
Development Period, all remaining chemical and biological materials included
in the Rigel Technology that are in Neurocrine's possession at the time of
expiration or termination of the Research and Development Period shall be
returned to Rigel, and all remaining chemical and biological materials included
in the Neurocrine Technology that are in Rigel's possession at the time of
expiration or termination of the Research and Development Period shall be
returned to Neurocrine, except to the extent that the parties may otherwise
agree during discussions conducted pursuant to Section 8.2 (b).

     8.4   EFFECTS OF EXPIRATION OR TERMINATION OF THE AGREEMENT. Sections 6,
7, 8, 9.1, 9.2, 9.3, 9.9 and 9.10 shall survive any expiration or termination
of this Agreement. Upon any termination of this Agreement prior to its
expiration pursuant to Section 8.1. the commercialization licenses granted
pursuant to Sections 5.3 and 5.4 shall survive such termination of this
Agreement; provided, however, that if this Agreement is terminated for material
breach by Neurocrine, then the license granted pursuant to Section 5.3 shall
not survive such termination, and further provided that if this Agreement is
terminated for material breach by Rigel, then the license granted pursuant to
Section 5.4 shall not survive such termination.

9.   MISCELLANEOUS PROVISIONS

     9.1   INDEMNIFICATION.

           (a)  Rigel agrees to indemnify, hold harmless and defend the
other, its officers, agents, and Affiliates (the "Neurocrine Indemnitees")
against any and all claims, suits, losses, damage, costs, fees and expenses
of or by third parties (collectively, "Claims") for damage to persons or
property resulting directly or indirectly from Rigel's, its Affiliates or its
sublicensee's actions in connection with its performance under this Agreement
or the manufacture, use, sale offer for sale or import of Rigel Collaboration
Products, except to the extent such Claims arise out of or result from the
negligence, recklessness or willful acts or omissions of the Neurocrine

                                      13.

<PAGE>

Indemnitees or arise out of or result from any breach of this Agreement by
the Neurocrine Indemnitee. Any Neurocrine Indemnitee shall give prompt notice
to Rigel of any Claims brought or filed against such Neurocrine Indemnitee,
and Rigel shall assume the defense of such Claims with counsel reasonably
satisfactory to the Neurocrine Indemnitee. Rigel will not be subject to any
liability for any settlement of such Claims made by a Neurocrine Indemnitee
without Rigel's consent (not to be unreasonably withheld). The Neurocrine
Indemnitee may retain separate counsel with respect to any such Claims at its
own expense.

           (b)  Neurocrine agrees to indemnify, hold harmless and defend the
other, its officers, agents, and Affiliates (the "Rigel Indemnitees") against
any and all claims, suits, losses, damage, costs, fees and expenses of or by
third parties (collectively, "Claims") for damage to persons or property
resulting directly or indirectly from Neurocrine's, its Affiliates or its
sublicensee's actions in connection with its performance under this Agreement
or the manufacture, use, sale offer for sale or import of Neurocrine
Collaboration Products, except to the extent such Claims arise out of or
result from the negligence, recklessness or willful acts or omissions of the
Rigel Indemnitees or arise out of or result from any breach of this Agreement
by the Rigel Indemnitee. Any Rigel Indemnitee shall give prompt notice to
Neurocrine of any Claims brought or filed against such Rigel Indemnitee, and
Neurocrine shall assume the defense of such Claims with counsel reasonably
satisfactory to the Rigel Indemnitee. Neurocrine will not be subject to any
liability for any settlement of such Claims made by a Rigel Indemnitee
without Neurocrine's consent (not to be unreasonably withheld). The Rigel
Indemnitee may retain separate counsel with respect to any such Claims at its
own expense.

     9.2   DISCLAIMER OF WARRANTIES. THE RIGEL TECHNOLOGY AND THE NEUROCRINE
TECHNOLOGY ARE PROVIDED BY RIGEL AND NEUROCRINE, RESPECTIVELY, "AS IS" AND
EACH PARTY EXPRESSLY DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING
WITHOUT LIMITATION WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE, NONIFRINGEMENT OF THE INTELLECTUAL PROPERTY RIGHTS OF
THIRD PARTIES OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICES
WITH RESPECT THERETO. Without limitation, each party expressly does not warrant
the success of any Research and Development activities or the safety or
usefulness of any technology it provides hereunder.

     9.3   DISPUTE RESOLUTION. If a dispute arises between the parties
relating to the interpretation or performance of this Agreement or the
grounds for the termination thereof, the parties agree to hold a meeting,
attended by individuals with decision-making authority regarding the dispute,
to attempt in good faith to negotiate a resolution of the dispute prior to
pursuing other available remedies. If, within 30 days after such meeting, the
parties have not succeeded in negotiating a resolution of the dispute, such
dispute shall be submitted to final and binding arbitration under the then
current Licensing Agreement Arbitration Rules of the American Arbitration
Association ("AAA"), with a panel of three arbitrators with significant
experience in the biopharmaceutical industry conducting proceedings in San
Diego, California. Such arbitrators

                                      14.

<PAGE>

shall be selected by mutual agreement of the parties or, failing such
agreement, shall be selected according to the aforesaid AAA rules. The parties
shall bear the costs of arbitration equally unless the arbitrators, pursuant to
their right, but not their obligation, require the non-prevailing party to bear
all or any unequal portion of the prevailing party's costs. The decision by the
arbitrators shall be made within ninety (90) days after the selection of the
arbitrators. The decision of the arbitrators shall be final and may be sued on
or enforced by the party in whose favor it decides in any court of competent
jurisdiction at the option of such party. The arbitrators will be instructed to
prepare and deliver a written, reasoned opinion conferring their decision. The
rights and obligations of the parties to arbitrate any dispute relating to the
interpretation or performance of this Agreement or the grounds for the
termination thereof shall survive the expiration or termination of this
Agreement for any reason.

     9.4   FORCE MAJEURE. Neither party shall be held liable or responsible to
the other party nor shall either party be deemed to have defaulted under or
breached this Agreement for failure or delay in fulfilling or performing any
term of this Agreement (other than payment of monies due) when such failure or
delay is caused by or results from causes beyond reasonable control of the
affected party including but not limited to fire, floods, embargoes, war, acts
of war (whether war be declared or not), insurrections, riots, civil commotions,
strikes, lockouts or other labor disturbances, acts of God or acts, omissions or
delays in acting by any governmental authority, or earthquakes, provided that
the affected party uses reasonable efforts to overcome such failure or delay.

     9.5   ASSIGNMENT. This Agreement may not be assigned or otherwise
transferred, nor, except as expressly provided hereunder, may any rights or
obligations hereunder be assigned or transferred, by either party without the
written consent of the other party; provided, however, that either party may,
without such consent, assign this Agreement and its rights and obligations
hereunder (a) in connection with the transfer or sale of all or substantially
all of its business, if such assets include substantially all of the assets
relating to its performance of its obligations hereunder, (b) to a wholly owned
subsidiary or, (c) in the event of its merger or consolidation with another
company at any time during the term of this Agreement. Any purported assignment
in violation of this Section 9.5 shall be void. Any permitted assignee shall
assume all obligations of its assignor under this Agreement.

     9.6   PUBLICITY. The parties agree that neither party will originate any
news release or other public announcement, written or oral, or otherwise make
any disclosure relating to the existence or terms of or performance under
this Agreement without the prior written approval of the other party, except
as may otherwise be required by law, or as provided in Section 7.4.

     9.7   EXPORT LAWS. Each party hereby agrees that no technology or
information licensed from the other, and no product thereof, will be made
available or re-exported, directly or indirectly, except in compliance with
all applicable export laws and regulations.

     9.8   SEVERABILITY. Both parties hereby expressly agree and contract
that it is the intention of neither party to violate any laws, rules,
regulations, treaty or decision of any

                                      15.

<PAGE>

government agency or executive body thereof of any country or community or
association of countries. Should a court or governmental authority of competent
jurisdiction determine that one or more provisions of this Agreement are invalid
or unenforceable by reason of such a violation, then the parties hereto shall
attempt to substitute, by mutual consent, valid provisions for such invalid
provisions, which valid provisions closely approximate the economic effect of
the invalid provisions. If the parties are unable to formulate a mutually
acceptable provision to replace any invalid provision, then such invalid
provisions shall be severed from this Agreement and the invalidity of such
provision shall not affect the validity of the Agreement as a whole.

     9.9   NOTICES.  Any notice or report required or permitted to be given or
made under this Agreement by one of the parties hereto to the other shall be in
writing, delivered personally or by facsimile (and promptly confirmed by
telephone, personal delivery or courier) or courier, postage prepaid, addressed
to such other party at its address indicated on the first page of this Agreement
(to the attention of Gary Lyons, if to Neurocrine, and to the attention of James
Gower, if to Rigel), or to such other address as the addressee shall have last
furnished in writing to the address or and shall be effective upon receipt by
the addressee.

     9.10  APPLICABLE LAW. This Agreement shall be governed by and construed
in accordance with the laws of the State of California, without regard to its
choice of law provisions, and any applicable laws of the United States.

     9.11  ENTIRE AGREEMENT; AMENDMENT. This Agreement contains the entire
understanding of the parties with respect to the subject matter hereof. All
express or implied agreements and understandings, either oral or written,
heretofore made are expressly merged into and made a part of this Agreement.
This Agreement may be amended, or any term hereof modified, only by a written
instrument duly executed by both parties hereto.

     9.12  INDEPENDENT CONTRACTORS. It is expressly agreed that Neurocrine and
Rigel shall be independent contractors and that the relationship between the two
parties shall not constitute a partnership, joint venture or agency of any kind.
Neither party shall have the authority to make any statements, representations
or commitments of any kind, or to take any action, which shall be binding on the
other, without the prior written authorization of the other party to do so.

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

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

                                      16.

<PAGE>

          IN WITNESS WHEREOF, the parties hereto have duly executed this
Collaborative Agreement.

NEUROCRINE, INC.                        RIGEL, INC.

By:  /s/ Kevin C. Gorman                By:  /s/ James Gower
   -------------------------------         --------------------------------
       Kevin C. Gorman                         James Gower
Title: Senior Director,                 Title: Chief Executive Officer
       Business Development

                                      17.<PAGE>

                                                                   Exhibit 10.11

                                RIGEL PHARMACEUTICALS
                     24 WINDSOR DRIVE, HILLSBOROUGH. CA 94010
                               PHONE/FAX: 415-579-4638

January 16, 1997

Dr. Donald G. Payan
24 Windsor Drive
Hillsborough, CA 94010

RE: EMPLOYMENT AGREEMENT

Dear Don:

     Rigel Pharmaceuticals, Inc. (the "Company") is pleased to offer you
the position of Vice President Research and Chief Operating Officer of the
Company beginning January 16, 1997 ("Effective Date") on the terms set forth
below (the "Agreement").

     As Vice President Research and COO, you will perform the duties
customarily associated with this position, and such duties as may be assigned
to you by the Company's President and CEO. Of course, the Company may change
your position, duties and work location from time to time, as it deems
necessary.

Your annual salary will be $185,000 ("Base Salary"), less standard deductions
and withholdings, paid semi-monthly. You will be expected to work as required
to complete your job duties.

     In addition, upon formal approval by the Board, the Company will issue
to you 750,000 shares of Company founders common stock as described in the
Company's Stock Purchase Agreement (the "Founders Stock"). This Founders
Stock will be subject to the repuchase provisions contained in the Stock
Purchase Agreement (the "Purchase Option"). If your employment with the
Company is terminated without cause within three years, then the Founders
Stock which remains subject to the Purchase Option will immediately lapse
according to the following: (i) in the event at least one-third (1/3) of the
Founders Stock remains subject to the Purchase Option, then the Purchase
Option shall lapse with respect to one-third (1/3) of the Founders Stock; or
(ii) in the event less than one-third (1/3) of the Founders Stock remains
subject to the Purchase Option, then the Purchase Option shall lapse with
respect to all such Founders Stock.

        In addition to your salary and equity compensation, on the Effective
Date the Company will provide you with sick and vacation leave, medical and
dental insurance coverage, and any other benefits consistent with Company
policy for exempt, full-time employees. Details about these benefits are
available for your review. The Company reserves the right to modify your
compensation and benefits from time to time, as it deems necessary.

<PAGE>

Dr. Donald G. Payan
January 16, 1997
Page 2

     The Company agrees to reimburse you for reasonable documented business
expenses pursuant to Company policy.

     You will be expected to abide by all of the Company's policies and
procedures. As a condition of your employment, you also agree to sign and
comply with the Company's Proprietary Information and Inventions Agreement
(attached hereto as Exhibit A).

     By accepting this offer, you represent and warrant that you are not a
parry to any agreement with any third party or prior employer which would
conflict with or inhibit your performance of your duties with the Company.

     Either you or the Company may terminate your employment relationship at
any time for any reason whatsoever, with or without cause or advance notice.
This at-will employment relationship cannot be changed except in a writing
signed by a duly authorized officer of the Company. If the Company terminates
your employment without cause, the Company will make severance payments to
you in the form of continuation of your base salary in effect on the
Effective Date for one (1) year following your separation from the Company.
These payments will be made on the Company's ordinary payroll dates, and will
be subject to standard payroll deductions and withholdings. In the event of
such termination, you will not be entitled to any additional compensation or
benefits beyond what is provided in this paragraph and in the paragraph above
relating to acceleration of Founders Stock vesting. If you resign or your
employment is terminated for cause, all compensation and benefits will cease
immediately, and you will receive no severance benefits. For purposes of this
Agreement, "cause" shall mean misconduct, including: (i) conviction of any
felony or any crime involving moral turpitude or dishonesty; (ii)
participation in a fraud or act of dishonesty against the Company; (iii)
material breach of the Company's policies; (iv) damage to the Company's
property; (v) material breach of this Agreement or your Proprietary
Information and Inventions Agreement; or (vi) conduct by you which in the
good faith and reasonable determination of the Board demonstrate s gross
unfitness to serve.

     You agree that, for one (1) year following the termination of your
employment with the Company, you will not personally initiate or participate
in the solicitation of any employee of the Company or any of its affiliates
to terminate his or her relationship with the Company or any of its
affiliates in order to become an employee for any other person or business
entity.

     To ensure rapid and economical resolution of any disputes which may
arise under this Agreement, you and the Company agree that any and all
disputes or controversies, whether of law or fact of any nature whatsoever
(including, but not limited to, all state and federal statutory and
discrimination claims), with the sole exception of those dispute, which may
arise from your Proprietary Information and inventions Agreement, arising
from or regarding your employment

<PAGE>

Dr. Donald G. Payan
January 16, 1997
Page 3

or the termination thereof, or the interpretation, performance, enforcement
or breach of this Agreement shall be resolved by confidential, final and
binding arbitration under the then-existing Rules of Practice and Procedure
of Judicial Arbitration and Mediation Services, Inc., which shall be
conducted in San Francisco, California.

     This Agreement, including Exhibit A constitutes the complete, final and
exclusive embodiment of the entire agreement between you and the Company with
respect to the terms and conditions of your employment. This Agreement is
entered into without reliance upon any promise, warranty or representation,
written or oral, other than those expressly contained herein, and it
supersedes any other such promises, warranties, representations or
agreements. It may not be amended or modified except by a written instrument
signed by you and a duly authorized officer of the Company. If any provision
of this Agreement is determined to be invalid or unenforceable, in whole or
in part, this determination will not affect any other provision of this
Agreement. This Agreement shall be construed and interpreted in accordance
with the laws of the State of California and shall be deemed drafted by both
parties.

     As required by law, this offer of employment is subject to satisfactory
proof of your right to work in the United States.

     If you choose to accept our offer under the terms described above,
please sign below and return this letter to me.

     We look forward to a productive and enjoyable work relationship.

                              Very truly yours,

                              RIGEL PHARMACEUTICALS, INC.

                              By:  /s/James M. Gower
                                 ---------------------------------------------
                                   James M. Gower

ACCEPTED BY:   /s/Donald G. Payan
             ----------------------
               Donald G. Payan

DATE:              1/16/97
             ----------------------

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