<PAGE>   1
                                                                   EXHIBIT 10.56


                    Confidential Materials omitted and filed
                   separately with the Securities and Exchange
                    Commission. Asterisks denote omissions.








                              AMENDED AND RESTATED
                         RESEARCH AND LICENSE AGREEMENT

                                 BY AND BETWEEN

                                    ASTRA AB

                                       AND

                        MILLENNIUM PHARMACEUTICALS, INC.





<PAGE>   2



                               TABLE OF CONTENTS
                               -----------------

                                                                         Page
                                                                         ----

Introduction ............................................................  1

Article I - Definitions .................................................  2
     Section 1.1.   "Affiliate" .........................................  2
     Section 1.2.   "Airway Delivery" ...................................  2
     Section 1.3.   "Analog Protein Drug" ...............................  2
     Section 1.4.   "Antisense Drug" ....................................  2
     Section 1.5.   "Astra Development Program" .........................  3
     Section 1.6.   "Astra Program Know-How" ............................  3
     Section 1.7.   "Astra Program Patent Right(s)" .....................  3
     Section 1.8.   "Astra Research Program" ............................  3
     Section 1.9.   "Bioinformatics" ....................................  3
     Section 1.10.  "Candidate Drug" ....................................  3
     Section 1.11.  "Candidate Gene" ....................................  3
     Section 1.12.  "Confidential Information" ..........................  4
     Section 1.13.  "Contract Year" .....................................  4
     Section 1.14.  "Diagnostic Product" ................................  4
     Section 1.15.  "Field" .............................................  4
     Section 1.16.  "First Commercial Sale" .............................  4
     Section 1.17.  "FTE" ...............................................  5
     Section 1.18.  "Gene Therapy Drug" .................................  5
     Section 1.19.  "Genetics Candidate Gene" ...........................  5
     Section 1.20.  "Genetics Validated Target" .........................  5
     Section 1.21.  "Geographical Region" ...............................  6
     Section 1.22.  "Hit" ...............................................  6
     Section 1.23.  "Know-How" ..........................................  6
     Section 1.24.  "Lead" ..............................................  6
     Section 1.25.  "Major Market Country" ..............................  6
     Section 1.26.  "Marketing Exclusivity" .............................  6
     Section 1.27.  "Millennium Core Technology" ........................  6
     Section 1.28.  "Millennium Core Technology Know-How" ...............  6
     Section 1.29.  "Millennium Core Technology Patent Right(s)" ........  7
     Section 1.30.  "Millennium Drug" ...................................  7
     Section 1.31.  "Millennium Field Know-How" .........................  7
     Section 1.32.  "Millennium Field Patent Right(s)" ..................  7
     Section 1.33.  "Millennium Research Program" .......................  7
     Section 1.34.  "Modified Drug" .....................................  7
     Section 1.35.  "Net Sales" .........................................  7
     Section 1.36.  "Novel Validated Target" ............................  9
     Section 1.37.  "Other Products" ....................................  9
     Section 1.38.  "Party" .............................................  9


                                      (i)


<PAGE>   3


                    Confidential Materials omitted and filed
                   separately with the Securities and Exchange
                    Commission. Asterisks denote omissions.

     Section 1.39.  "Patent Right(s)"                                       9
     Section 1.40.  "Peptido Mimetic Drug" ..............................  10
     Section 1.41.  "Pre-Candidate Gene" ................................  10
     Section 1.42.  "Product" ...........................................  10
     Section 1.43.  "Program Analog Protein Drug" .......................  10
     Section 1.44.  "Program Antisense Drug" ............................  10
     Section 1.45.  "Program Know-How" ..................................  10
     Section 1.46.  "Program Patent Rights" .............................  11
     Section 1.47.  "Program Peptido Mimetic Drug" ......................  11
     Section 1.48.  "Program Protein Drug" ..............................  11
     Section 1.49.  "Program Protein Mimic Drug" ........................  11
     Section 1.50.  "Program Small Molecule Drug" .......................  11
     Section 1.51.  "Protein"                                              11
     Section 1.52.  "Protein Drug" ......................................  11
     Section 1.53.  "Protein Mimic Drug" ................................  11
     Section 1.54.  "Public Domain" .....................................  12
     Section 1.55.  [**] ................................................  12
     Section 1.56.  "Related Antisense Drug" ............................  12
     Section 1.57.  "Related Peptido Mimetic Drug" ......................  12
     Section 1.58.  "Related Small Molecule Drug" .......................  12
     Section 1.59.  "Research Program" ..................................  12
     Section 1.60.   [**] ...............................................  12
     Section 1.61.  "Small Molecule Drug" ...............................  13
     Section 1.62.  "Small Molecule Process Flow Schedule" ..............  13
     Section 1.63.  "Sublicensee" .......................................  13
     Section 1.64.  "Territory" .........................................  13
     Section 1.65.  "Validated Protein" .................................  13
     Section 1.66.  "Validated Target" ..................................  13
     Section 1.67.  "Valid Claims" ......................................  14

Article II - Research and Collaboration Program .........................  14
     Section 2.1.  Exclusive Arrangement. ...............................  14
     Section 2.2.  Joint Management Team. ...............................  14
     Section 2.3.  Joint Management Team Responsibilities. ..............  15
     Section 2.4.  Goals and Objectives. ................................  17
     Section 2.5.  Joint Management Team Decisions. .....................  17
     Section 2.6.  Research Program Plan. ...............................  18
     Section 2.7.  Term of the Millennium Research Program. .............  18
     Section 2.8.  Diligence. ...........................................  20
     Section 2.9.  Small Molecule High Throughput Screening .............  21


                                      (ii)


<PAGE>   4


                    Confidential Materials omitted and filed
                   separately with the Securities and Exchange
                    Commission. Asterisks denote omissions.

Article III - Disclosure of Know-How ....................................  21
     Section 3.1.  Millennium Know-How. .................................  21
     Section 3.2.  Biological Materials. ................................  22
     Section 3.3.  Astra Program Know-How.                                 22

Article IV - Confidentiality ............................................  22
     Section 4.1.  Confidential Information and Know-How. ...............  22
     Section 4.2.  Employee Obligations. ................................  23
     Section 4.3.  Publications. ........................................  24
     Section 4.4.  Term. ................................................  24

Article V - Grant of Rights .............................................  25
     Section 5.1.  Licenses to Millennium Core Technology. ..............  25
     Section 5.2.  Licenses to Millennium Field Patent Rights and
                    Millennium Field Know-How for Research Purposes ...... 25
     Section 5.3.  Product Licenses. ....................................  25
     Section 5.4.  Millennium's Retained Rights. ........................  30
     Section 5.5.  Millennium Drugs. ....................................  30
     Section 5.6.  Rights to Potential Candidate Genes, Validated
                    Targets and Validated Proteins. ...................... 31
     Section 5.7.  Astra's Rights to Diagnostic Products Not Being
                   Commercialized by Millennium. ........................  32

Article VI - Patent Ownership, Protection And Related Matters ...........  32
     Section 6.1.  Ownership. ...........................................  32
     Section 6.2.  Patentable Inventions. ...............................  32
     Section 6.3.  Review and Comment. ..................................  33
     Section 6.4.  Notice of Decision. ..................................  34
     Section 6.5.  Patent Term Extensions. ..............................  34
     Section 6.6.  Costs and Expenses. ..................................  34
     Section 6.7.  Third Party Infringement. ............................  34
     Section 6.8.  Millennium Core Technology. ..........................  36
     Section 6.9.  Notice of Certification. .............................  36
     Section 6.10. Claimed Infringement; Claimed Invalidity. ............  36

Article VII - Astra Due Diligence .......................................  37
     Section 7.1.  Candidate Genes. .....................................  37
     Section 7.2.  Validated Proteins. ..................................  37
     Section 7.3.  Validated Targets. ...................................  38
     Section 7.4.  Astra Minimum Efforts. ...............................  38
     Section 7.5.  Commercialization ....................................  38
     Section 7.6.  Niche Products .......................................  39


                                     (iii)


<PAGE>   5



Article VIII - Payments .................................................  40
     Section 8.1.  Initial License Fees. ................................  40
     Section 8.2.  Additional Fees. .....................................  41
     Section 8.3.  Research Funding. ....................................  43
     Section 8.4.  Milestones. ..........................................  45
     Section 8.5.  Royalty Payments to Millennium on Products. ..........  45
     Section 8.6.  Length of Royalty Payments. ..........................  45
     Section 8.7.  Royalties Payable Only Once. .........................  46
     Section 8.8.  Other Products. ......................................  46
     Section 8.9.  Payment Obligations to Third Parties. ................  46
     Section 8.10. Bankruptcy. ..........................................  46

Article IX - Accounting .................................................  47
     Section 9.1.  Royalty Reports. .....................................  47
     Section 9.2.  Delivery of Royalty. .................................  47
     Section 9.3.  Records and Audits. ..................................  47
     Section 9.4.  Currency of Payments. ................................  47
     Section 9.5.  Tax Withholding. .....................................  48

Article X - Term and Termination ........................................  48
     Section 10.1.  Term. ...............................................  48
     Section 10.2.  Material Non-Performance. ...........................  48
     Section 10.3.  Rights Upon Termination for Default. ................  49
     Section 10.4.  Residual Rights. ....................................  50

Article XI - Product Liability Indemnification ..........................  51

Article XII - Good Faith Negotiation/Dispute Resolution .................  52
     Section 12.1.  General. ............................................  52
     Section 12.2.  Dispute Resolution Process. .........................  52
     Section 12.3.  Arbitration Costs. ..................................  53

Article XIII - Governing Law ............................................  53

Article XIV - Assignment ................................................  53

Article XV - Amendments .................................................  53

Article XVI - Notices ...................................................  54

Article XVII - Force Majeure ............................................  55


                                      (iv)


<PAGE>   6


Article XVIII - Representations and Warranties ..........................  55
     Section 18.1.  Representation of Authority. ........................  55
     Section 18.2.  Outstanding Agreements. .............................  55
     Section 18.3.  Knowledge of Pending or Threatened Litigation. ......  56
     Section 18.4.  Employee Obligations. ...............................  56
     Section 18.5.  Full Disclosure. ....................................  56

Article XIX - Public Announcements ......................................  56

Article XX - Additional Agreements ......................................  57
     Section 20.1.  Independent Contractors. ............................  57
     Section 20.2.  Consents Not Unreasonably Withheld. .................  57
     Section 20.3.  No Strict Construction. .............................  57
     Section 20.4.  Headings. ...........................................  57
     Section 20.5.  Severance of Clauses. ...............................  57
     Section 20.6.  No Waiver. ..........................................  57
     Section 20.7.  Change in Control. ..................................  58

Appendix A -- Research Program Plan

Appendix B -- Third Party Agreements with Millennium

Appendix C -- Small Molecule Process Flow Schedule


                                      (v)


<PAGE>   7


                              AMENDED AND RESTATED
                         RESEARCH AND LICENSE AGREEMENT

     This Amended and Restated Agreement (the "Agreement") is entered into as of
December 1998 and effective as of the 9th day of December, 1995 (the "Effective
Date"), by and between Millennium Pharmaceuticals, Inc., a corporation organized
and existing under the laws of the State of Delaware and having its principal
office at 640 Memorial Drive, Cambridge, Massachusetts 02139-4815 (together with
its Affiliates, "Millennium") and Astra AB, a corporation organized and existing
under the laws of Sweden and having its principal place of business at S-151 85
Sodertalje, Sweden (together with its Affiliates, "Astra").

                                  INTRODUCTION

     1. Millennium is in the business of conducting research in the field of
human genomics, an objective of which is to discover potential biological
targets and assays for use in drug discovery.

     2. Astra is in the business of discovering, developing and marketing
pharmaceuticals.

     3. Astra is interested in funding and collaborating with Millennium in
discovering and developing targets and assays to identify and develop small
molecule drugs primarily for the treatment of inflammatory respiratory diseases,
and in obtaining, under specified circumstances, rights to other types of
therapeutic molecules useful primarily in the treatment of inflammatory
respiratory diseases that are identified through the use of technology developed
before or during the collaboration.

     4. Millennium is willing to provide know-how, materials and licenses to
Astra to allow Astra to use certain of Millennium's technology in all fields and
is also willing to provide know-how, materials and licenses to Astra to use
certain of Millennium's technology in the field of inflammatory respiratory
diseases.

     5. Astra and Millennium entered into a Research and License Agreement (the
"Original Agreement") on December 9, 1995 and desire to amend and restate the
terms of the Original Agreement.

     NOW, THEREFORE, Millennium and Astra agree as follows:


                                       1


<PAGE>   8


                                   ARTICLE I

     When used in this Agreement, each of the following terms shall have the
meanings set forth in this Article I:

     SECTION 1.1. "AFFILIATE" means any corporation, company, partnership, joint
venture and/or firm which controls, is controlled by or is under common control
with a Party. For purposes of this Section 1.1, "control" shall mean, (a) in the
case of corporate entities, direct or indirect ownership of at least fifty
percent (50%) of the stock or shares having the right to vote for the election
of directors, and (b) in the case of non-corporate entities, direct or indirect
ownership of at least fifty percent (50%) of the equity interest with the power
to direct the management and policies of such non-corporate entities.

     SECTION 1.2. "AIRWAY DELIVERY" means a method of administering a drug by
oral inhalation or nasal administration.

     SECTION 1.3. "ANALOG PROTEIN DRUG" means a Protein or polypeptide which has
been modified through a change in its primary structure resulting in a
functionally significant change (such as a change in its pharmacokinetic or
pharmacodynamic properties) to allow it to become a therapeutic product
demonstrating relevant IN VITRO and IN VIVO activity. For purposes of this
definition, a polypeptide constituting the pharmacologically active fragment of
a Protein, that has not been modified through a change in its primary structure
resulting in a functionally significant change, shall not be considered an
Analog Protein Drug.

     SECTION 1.4. "ANTISENSE DRUG" means any drug or drug candidate which
consists of nucleic acid or a functional analog, derivative or homologue thereof
and which is complementary to a segment of DNA of a target gene or such target
gene's cognate RNA and which, upon delivery by any means, alters the
transcription, processing, elaboration, RNA expression, or protein production of
or by such target gene, PROVIDED THAT Antisense Drug shall not include any
nucleic acid or a functional analog, derivative or homologue thereof which, upon
delivery by any means, must be expressed in order to alter the transcription,
processing, elaboration, RNA expression, or protein production of or by a target
gene.


                                       2


<PAGE>   9

                    Confidential Materials omitted and filed
                   separately with the Securities and Exchange
                    Commission. Asterisks denote omissions.

     SECTION 1.5. "ASTRA DEVELOPMENT PROGRAM" means development activities
performed by Astra, commencing during or after the term of the Millennium
Research Program and concluding on the [**] of the termination of the Millennium
Research Program, to discover and develop Products in the Field based on the
results arising from the Millennium Research Program and/or the Astra Research
Program.

     SECTION 1.6. "ASTRA PROGRAM KNOW-HOW" means Know-How (a) which is necessary
or useful in order to discover, develop, make, use, sell or seek approval to
market therapeutic products for medical indications in the Field, and (b) which
Astra develops, uses or acquires during the term of the Astra Research Program
or the Astra Development Program, and (c) to which Astra has the right to grant
licenses or sublicenses without violating the terms of any agreement or other
arrangement with a third party.

     SECTION 1.7. "ASTRA PROGRAM PATENT RIGHT(S)" means a Patent Right (a) that
relates to Astra Program Know-How, and (b) that is obtained by Astra during the
term of the Astra Research Program or the Astra Development Program, and (c) to
which Astra has the right to grant licenses or sublicenses without violating the
terms of any agreement or other arrangement with a third party.

     SECTION 1.8. "ASTRA RESEARCH PROGRAM" means the research program, to be
undertaken by Astra coincident and coterminous with the term of the Millennium
Research Program, to discover Products in the Field (a) based on Millennium
Field Know-How and Millennium Field Patent Rights, and/or (b) based on
Millennium Core Technology Know-How as used in the Field and Millennium Core
Technology Patent Rights as used in the Field.

     SECTION 1.9. "BIOINFORMATICS" means [**] and any other software tools
developed or acquired by Millennium for the [**].

     SECTION 1.10. "CANDIDATE DRUG" means a Lead that (a) has been sufficiently
optimized, and (b) Astra has decided to enter into Astra Development Program
pre-clinical studies.

     SECTION 1.11. "CANDIDATE GENE" means (a) a Genetics Candidate Gene or (b) a
Pre-Candidate Gene, or a gene in its pathway, whose function has been [**]
before or in the course of the Research Program, as evidenced by at least one IN
VITRO model (including appropriate expression in relevant human cells or
tissues) and at least one IN VIVO model of disease in which for each model i)
the disregulation of the expression of the gene or Protein encoded by the gene,
or ii) the modification of the


                                       3


<PAGE>   10


function of the Protein encoded by the gene, results in a statistically
significant modified biological response, all as determined in good faith by the
Joint Management Team.

     SECTION 1.12. "CONFIDENTIAL INFORMATION" means all materials, KnowHow or
other information, including, without limitation, proprietary information and
materials (whether or not patentable)regarding a Party's technology, products,
business information or objectives, which is designated as confidential in
writing by the disclosing Party, whether by letter or by the use of an
appropriate stamp or legend, prior to or at the time any such material, trade
secret or other information is disclosed by the disclosing Party to the other
Party. Notwithstanding the foregoing to the contrary, materials, KnowHow or
other information which is orally, electronically or visually disclosed by a
Party, or is disclosed in writing without an appropriate letter, stamp or
legend, shall constitute Confidential Information if the disclosing Party,
within thirty (30)days after such disclosure, delivers to the other Party a
written document or documents describing the materials, KnowHow or other
information and referencing the place and date of such oral, visual, electronic
or written disclosure and the names of the persons to whom such disclosure was
made, PROVIDED, HOWEVER, that any technical information disclosed at a meeting
of the Joint Management Team shall constitute Confidential Information unless
otherwise specified.

     SECTION 1.13. "CONTRACT YEAR" means the twelve- (12-) month period
beginning on January 1, 1996, and each succeeding twelve- (12-) month period
thereafter.

     SECTION 1.14. "DIAGNOSTIC PRODUCT" means any diagnostic product in the form
of a device, compound, kit or service.

     SECTION 1.15. "FIELD" means inflammatory respiratory disease, including
without limitation, asthma, rhinitis, chronic obstructive lung disease and
chronic bronchitis, but not including pneumonia, bronchiectasis and
bronchiolithiasis, primary pulmonary hypertension, pulmonary thromboembolism,
cystic fibrosis and neoplasms of the lung.

     SECTION 1.16. "FIRST COMMERCIAL SALE" means, for each Product, (a) with
respect to a Major Market Country, the first commercial sale in such Major
Market Country as part of a nationwide introduction by Astra, and/or its
Sublicensees other than for clinical trial purposes or compassionate use, or (b)
with respect to any country in the Territory other than a Major Market Country,
the first commercial sale in any Major Market Country located in the
Geographical Region in which such country is located


                                       4


<PAGE>   11


                    Confidential Materials omitted and filed
                   separately with the Securities and Exchange
                     Commission. Asterisks denote omissions.

as part of a nationwide introduction by Astra and/or its Sublicensees other than
for clinical trial purposes or compassionate use.

     SECTION 1.17. "FTE" means a full time equivalent scientific person year
(consisting of a total of one thousand eight hundred eighty (1,880)hours per
year of scientific work on or directly related to the Millennium Research
Program), carried out by a Millennium employee, having at least a Bachelor's
Degree Scientific work on or directly related to the Millennium Research Program
to be performed by Millennium employees can include, but is not limited to,
experimental laboratory work, recording and writing of results, reviewing
literature and references, holding scientific discussions, managing and leading
scientific staff, development and application of Bioinformatics tools related to
the Millennium Research Program, and carrying out project management duties.
1.18 Section . "Gene Therapy Drug" means any drug or drug candidate which
consists of nucleic acid or a functional analog, derivative or homologue thereof
and which, upon delivery by any means, provides a gene product encoded therein
which is expressed.

     SECTION 1.19. "GENETICS CANDIDATE GENE" means an isolated gene which has
been [**] in the course of the Research Program by either Party. A [**] must be
[**](a) [**]; or (b) [**] (in which instance the Genetics Candidate Gene shall
mean the [**].

     SECTION 1.20. "GENETICS VALIDATED TARGET" means a biological molecule that
(a) is a Genetics Candidate Gene, a Protein encoded by a Genetics Candidate Gene
or another qualifying biological molecule in a relevant biochemical pathway, the
identification of which or the linkage with a disease is based upon the
identification of a Genetics Candidate Gene, and (b) that (i) has been
configured into a research assay that is suitable for the identification of
small molecule agonists or antagonists of such biological molecule and which
research assay is (1) a biochemical assay (including without limitation, a
competitive binding assay for a receptor or an enzyme substrate conversion
assay), or (2) a reporter based assay, in either case having a robust assay
readout (such as fluorescence, chemiluminescence, and/or radioactivity that has
the potential to be configured into a high throughput screen and is therefore
suitable for undertaking research activities to develop a high throughput
screen, or (ii) is suitable for use in rational drug design efforts or (iii) is
suitable for use in Antisense Drug development efforts, all as determined in
good faith by the Joint Management Team.


                                       5


<PAGE>   12


                    Confidential Materials omitted and filed
                   separately with the Securities and Exchange
                     Commission. Asterisks denote omissions.


     SECTION 1.21. "GEOGRAPHICAL REGION" means a geographical region that
consists of (a) North America, Central America and South America, (b) Africa and
Europe, including Turkey and all areas previously a part of the former Soviet
Union as of January 1, 1990, or (c) all countries of the world not included in
either clause (a) or (b).


     SECTION 1.22. "HIT" means a synthetic or naturally derived small molecule
therapeutic product (weighing equal to or less than 5,000 daltons) that is
identified based on its activity in (a) an initial small molecule screen against
a Validated Target, or (b) through rational drug design directed at a Validated
Target, and (c) in either case, has had its activity confirmed in a secondary
assay.

     SECTION 1.23. "KNOW-HOW" means any information, data and materials,
including organic compounds and biological materials such as cell lines, RNA,
DNA, DNA fragments, organisms, Proteins, polypeptides, plasmids and vectors and
software, user's manuals and guides.

     SECTION 1.24. "LEAD" means a Hit that has been analyzed by exploratory
chemistry and which has been determined by Astra to have a structure activity
relationship that is of sufficient interest to warrant an expanded commitment to
resources for medicinal chemistry.

     SECTION 1.25. "MAJOR MARKET COUNTRY" means the United States, Canada, the
United Kingdom, Sweden, Germany, France, Italy, Spain, Japan, China or
Australia.

     SECTION 1.26. "MARKETING EXCLUSIVITY" means the marketing exclusivity
afforded approved drug products pursuant to the exclusivity provisions of the
United States "Drug Price Competition and Patent Term Restoration Act of 1984,"
or its equivalent in a country other than the United States.

     SECTION 1.27. "MILLENNIUM CORE TECHNOLOGY" means [**].

     SECTION 1.28. "MILLENNIUM CORE TECHNOLOGY KNOW-HOW" means Know-How that
relates to Millennium Core Technology, that either (a) is in Millennium's
possession on the Effective Date or (b) is developed by Millennium during the
term of the Millennium Research Program, or (c) is acquired by Millennium during
the term of the Millennium Research Program, with the right to grant licenses or
sublicenses without violating the terms of any agreement or other arrangement
with a third party.


                                       6


<PAGE>   13


                    Confidential Materials omitted and filed
                   separately with the Securities and Exchange
                     Commission. Asterisks denote omissions.


     SECTION 1.29. "MILLENNIUM CORE TECHNOLOGY PATENT RIGHT(S)" means a Patent
Right that relates to Millennium Core Technology.

     SECTION 1.30. "MILLENNIUM DRUG" means any Small Molecule Drug or Peptido
Mimetic Drug, that is discovered, identified or developed as a result of a
screening effort undertaken pursuant to Section 5.5. Millennium Drug shall not
include any Modified Drug, Program Small Molecule Drug, Related Small Molecule
Drug, Program Peptido Mimetic Drug or Related Peptido Mimetic Drug.

     SECTION 1.31. "MILLENNIUM FIELD KNOW-HOW" means Know-How owned or
controlled by Millennium which is necessary or useful in order to discover,
develop, make, use, sell or seek approval to market therapeutic products for
medical indications in the Field, and which (a) is in Millennium's possession on
the Effective Date, or (b) Millennium develops in the course of the Millennium
Research Program, or (c) Millennium acquires in the course of the Millennium
Research Program and to which Millennium has the right to grant licenses or
sublicenses without violating the terms of any agreement or other arrangement
with a third party, provided, however, that Millennium Field Know-How shall not
include (i) Millennium Core Technology Know-How and other generalized methods
for conducting genomic research and characterizing the function of genes, and
(ii) information and biological samples relating to human materials acquired or
otherwise accessed by Millennium and used in genetic analysis in the Millennium
Research Program.

     SECTION 1.32. "MILLENNIUM FIELD PATENT RIGHT(S)" means a Patent Right that
relates to Millennium Field Know-How (including a Patent Right owned jointly by
the Parties and relating to the Field).

     SECTION 1.33. "MILLENNIUM RESEARCH PROGRAM" means the research program, the
term of which extends during the time that research is funded by Astra pursuant
to Section 8.3 of this Agreement, and which is to be undertaken by Millennium
using genetics or genomic technology to discover and characterize Pre-Candidate
Genes, Candidate Genes, Validated Targets and Validated Proteins with potential
utility for the identification and development of Products in the Field, that is
described in greater detail in APPENDIX A.

     SECTION 1.34. "MODIFIED DRUG" means a compound which (a) other than through
the use of [**], was known to [**] to have [**] to its development as a
therapeutic product in the Field, and (b) was [**] or [**] through the use of
[**] to improve its therapeutic properties (but not merely to characterize the
compound) for use in the Field. Modified Drug shall not include any Program
Small Molecule Drug, 


                                       7


<PAGE>   14


Related Small Molecule Drug, Program Peptido Mimetic Drug, Related Peptido
Mimetic Drug, Program Antisense Drug, Related Antisense Drug, Program Protein
Drug, Program Analog Protein Drug, Program Protein Mimic Drug or Gene Therapy
Drug.

     SECTION 1.35. "NET SALES" means with respect to a Product, the gross amount
invoiced by Astra and/or its Sublicensees, on sales or other dispositions of the
Product to unrelated third parties, less the following items, provided that such
items are included in the price charged and do not exceed reasonable and
customary amounts in the country in which such sale occurred:

          (a) Trade, cash and quantity discounts actually allowed and taken;

          (b) Excises, sales taxes or other taxes imposed upon and paid with
     respect to such sales (excluding national, state or local taxes based on
     income);

          (c) Freight, insurance and other transportation charges incurred in
     shipping the Product to third parties;

          (d) Amounts repaid or credited by reason of rejections, defects,
     recalls or returns or because of retroactive price reductions;

          (e) Rebates paid pursuant to government regulations; and

          (f) With respect to Net Sales in Japan, back margin actually allowed
     and taken in customary and reasonable amounts.

Such amounts shall be determined from the books and records of Astra, and/or its
Sublicensees, maintained in accordance with generally accepted accounting
principles, consistently applied.

     If a Product is sold, leased, used or otherwise commercially disposed of
for value (including, without limitation, disposition in connection with the
delivery of other products or services) in a transaction that is not an outright
arm's length sale to an independent third party, then the gross amount invoiced
in such transaction shall be deemed to be the gross amount that would have been
paid had there been such a sale at the average sale price of such Product during
the applicable royalty reporting period. Net Sales shall not include any
consideration received by Astra or its Sublicensees in respect of the sale, use
or other disposition of a Product in a country prior to the receipt of all
regulatory approvals required to commence full commercial sales of such Product
in such country, including the sale, use or other disposition of such Product in
the course of any clinical trial conducted in the course of the Astra
Development Program, sales under "treatment INDs," "named patient sales,"
"compassionate use sales," or their equivalents.


                                       8


<PAGE>   15


     In the event the Product is sold as part of a Combination Product (as
defined below), the Net Sales from the Combination Product, for the purposes of
determining royalty payments, shall be determined by multiplying the Net Sales
of the Combination Product (as defined in the standard Net Sales definition),
during the applicable royalty reporting period, by the fraction, A/A+B where A
is the average sale price of the Product when sold separately in finished form
and B is the average sale price of the other product(s) included in the
Combination Product when sold separately in finished form, in each case during
the applicable royalty reporting period or, if sales of both the Product and the
other product(s) did not occur in such period, then in the most recent royalty
reporting period in which sales of both occurred. In the event that such average
sale price cannot be determined for both the Product and all other product(s)
included in the Combination Product, Net Sales for the purposes of determining
royalty payments shall be calculated by multiplying the Net Sales of the
Combination Product by the fraction C/C+D where C is the fair market value of
the Product and D is the fair market value of all other pharmaceutical
product(s) included in the Combination Product. As used above, the term
"Combination Product" means any pharmaceutical product which comprises the
Product and other active compounds and/or ingredients.

     SECTION 1.36. "NOVEL VALIDATED TARGET" means a Validated Target (other than
a Genetics Validated Target) that, at the time of discovery or subsequently
during its validation, is: (a) determined to encode a novel Protein based on (i)
greater than fifty percent (50%) of the nucleic acid sequence of the full length
coding sequence not being present in the Public Domain or (ii) assignment of the
Protein to a class of Proteins when such classification was previously unknown;
or (b) novelly annotated wherein such novel annotation relates to the role of
such Validated Target in (i) respiratory disease or (ii) inflammation. In order
to qualify as a Novel Validated Target such Validated Target shall be reasonably
believed to lead to a valid and enforceable patent in the United States as
determined in good faith by Joint Management Team.

     SECTION 1.37. "OTHER PRODUCTS" means any pharmaceutical product which does
not comprise a Modified Drug, Program Small Molecule Drug, Related Small
Molecule Drug, Program Peptido Mimetic Drug, Related Peptido Mimetic Drug,
Program Antisense Drug, Related Antisense Drug, Program Protein Drug, Program
Analog Protein Drug or Program Protein Mimic Drug.

     SECTION 1.38. "PARTY" means Astra or Millennium; "PARTIES" means Astra and
Millennium.

     SECTION 1.39. "PATENT RIGHT(S)" means a patent or patent application and
all divisions, continuations, continuations-in-part, reissues, reexaminations,
extensions and foreign counterparts thereof that is owned or controlled by
Millennium and/or 


                                       9


<PAGE>   16


                    Confidential Materials omitted and filed
                   separately with the Securities and Exchange
                     Commission. Asterisks denote omissions.


by Astra, or a license to the same to which either Millennium or Astra has the
right to grant a sublicense.

     SECTION 1.40. "PEPTIDO MIMETIC DRUG" means a synthetic organic molecule
(weighing equal to or less than 5,000 daltons) which is designed or developed
using medicinal chemistry, SAR or combinatorial chemistry techniques to interact
with a Validated Target and which incorporates key properties of a peptide and
which is a therapeutic product.

     SECTION 1.41. "PRE-CANDIDATE GENE" means an [**] which has been [**] by any
method other than [**] and that (a) is [**], or (b) [**] to (i) a gene that
encodes a Protein of demonstrated utility as a therapeutic or (ii) a class of
genes that encode Proteins that have been demonstrated to be generally suitable
as a target for the identification of small molecule functional agonists or
antagonists, and (iii) in each of (i) and (ii) whose pattern of RNA expression
(or a Protein encoded by such gene whose pattern of expression) is of
appropriate distribution in tissues and cell types (human or animal) implicated
in the Field.

     SECTION 1.42. "PRODUCT" means any product that comprises (a) a Program
Small Molecule Drug, (b) a Related Small Molecule Drug, (c) a Program Peptido
Mimetic Drug, (d) a Related Peptido Mimetic Drug (e) a Program Antisense Drug,
(f) a Related Antisense Drug, (g) a Program Protein Drug, (h) a Program Analog
Protein Drug, (i) a Program Protein Mimic Drug, or (j) a Modified Drug,
provided, however, that Product shall not include any (1) Millennium Drug, (2)
Gene Therapy Drug, (3) Diagnostic Product or (4) Other Product.

     SECTION 1.43. "PROGRAM ANALOG PROTEIN DRUG" means an Analog Protein Drug
which, in the course of the Research Program or the Astra Development Program,
is discovered or the development of which is undertaken or the relevant
biological activity of which is identified, and which is based on a Validated
Protein or a Program Protein Drug.

     SECTION 1.44. "PROGRAM ANTISENSE DRUG" means an Antisense Drug which, in
the course of the Research Program or the Astra Development Program, is
discovered or the development of which is undertaken or the relevant biological
activity of which is identified.

     SECTION 1.45. "PROGRAM KNOW-HOW" means Millennium Field Know-How and Astra
Program Know-How, collectively, whether or not developed or acquired solely


                                       10


<PAGE>   17
                    Confidential Materials omitted and filed
                  separately with the Securities and Exchange
                   Commission. Asterisks denote omissions.

or jointly by Millennium and/or Astra. Program Know-How includes but is not
limited to Candidate Genes, Validated Targets and Validated Proteins.

     SECTION 1.46. "PROGRAM PATENT RIGHTS" means Millennium Field Patent Rights
and Astra Program Patent Rights, collectively, whether or not developed or
acquired solely or jointly by Millennium and/or Astra.

     SECTION 1.47. "PROGRAM PEPTIDO MIMETIC DRUG" means a Peptido Mimetic Drug
which, in the course of the Research Program or the Astra Development Program,
is discovered or the development of which is undertaken or the relevant
biological activity of which is identified.

     SECTION 1.48. "PROGRAM PROTEIN DRUG" means a Protein Drug which, in the
course of the Research Program or the Astra Development Program, is discovered,
or the development of which is undertaken or the relevant biological activity of
which is identified.

     SECTION 1.49. "PROGRAM PROTEIN MIMIC DRUG" means a Protein Mimic Drug
which, in the course of the Research Program or the Astra Development Program,
is discovered or the development of which is undertaken or the relevant
biological activity of which is identified, and which mimics a Validated Protein
or a Program Protein Drug.

     SECTION 1.50. "PROGRAM SMALL MOLECULE DRUG" means a Small Molecule Drug
which, in the course of the Research Program or the Astra Development Program,
is discovered or the development of which is undertaken or the relevant
biological activity of which is identified.

     SECTION 1.51. "PROTEIN" means any of a class of high molecular weight
(i.e., weighing greater than [**]) polymer compounds composed of a variety of
amino acids joined by peptide linkages, including aggregates, hybrids and
fragments thereof, as well as naturally post-translationally modified variants
thereof (i.e., glycosylated proteins) and chemically modified versions thereof
(e.g., pegylated or liposomally encapsulated proteins).

     SECTION 1.52. "PROTEIN DRUG" means a Protein that is, or is being developed
for use as, a therapeutic product.

     SECTION 1.53. "PROTEIN MIMIC DRUG" means a synthetic organic molecule which
is a mimic of, or is designed or developed using medicinal chemistry, SAR or


                                       11


<PAGE>   18


                    Confidential Materials omitted and filed
                   separately with the Securities and Exchange
                     Commission. Asterisks denote omissions.


combinatorial chemistry techniques to incorporate key properties of, a Protein
and which is a therapeutic product.

     SECTION 1.54. "PUBLIC DOMAIN" means available to the general public in any
manner, including without limitation (a) in a published scientific paper, (b) in
an issued patent or a published patent application, or (c) in an electronically
published database (e.g. GenBank, DBEST, etc.).

     SECTION 1.55. [**] means methods developed or acquired by Millennium for
the automated or semi-automated use of [**] that are [**].

     SECTION 1.56. "RELATED ANTISENSE DRUG" means an Antisense Drug which, in
the course of the Research Program or the Astra Development Program, is
discovered or the development of which is undertaken or the relevant biological
activity of which is identified, and which (a) reacts with the same Validated
Target as, and (b) is covered by the same patent(s) or patent application(s) as,
and (c) is a member of the same chemical genus as, a corresponding Program
Antisense Drug.

     SECTION 1.57. "RELATED PEPTIDO MIMETIC DRUG" means a Peptido Mimetic Drug
which, in the course of the Research Program or the Astra Development Program,
is discovered or the development of which is undertaken or the relevant
biological activity of which is identified, and which (a) reacts with the same
Validated Target as, and (b) is covered by the same patent(s) or patent
application(s) as, and (c) is a member of the same chemical genus as, a
corresponding Program Peptido Mimetic Drug.

     SECTION 1.58. "RELATED SMALL MOLECULE DRUG" means a Small Molecule Drug
which, in the course of the Research Program or the Astra Development Program,
is discovered or the development of which is undertaken or the relevant
biological activity of which is identified, and which (a) reacts with the same
Validated Target as, and (b) is covered by the same patent(s) or patent
application(s) as, and (c) is a member of the same chemical genus as, a
corresponding Program Small Molecule Drug.

     SECTION 1.59. "RESEARCH PROGRAM" means, collectively, the Millennium
Research Program and the Astra Research Program.

     SECTION 1.60. [**] means integrated software tools for the [**] to identify
and provide [**], provided that [**] shall not include (a) metatools (i.e.,
software tools 


                                       12


<PAGE>   19


                    Confidential Materials omitted and filed
                   separately with the Securities and Exchange
                     Commission. Asterisks denote omissions.

used to develop the [**] themselves), (b) source code, or (c) tools developed by
Millennium to [**] structure and [**] from primary [**].

     SECTION 1.61. "SMALL MOLECULE DRUG" means a small molecule therapeutic
product (weighing equal to or less than [**]), other than a Modified Drug, a
Peptido Mimetic Drug, an Antisense Drug, a Protein Drug, an Analog Protein Drug,
a Protein Mimic Drug or a Gene Therapy Drug.

     SECTION 1.62. "SMALL MOLECULE PROCESS FLOW SCHEDULE" means the stages of
the discovery process for Pre-Candidate Genes, Candidate Genes, Validated
Targets, Hits, Leads and Candidate Drugs that are identified in the course of
the Millennium Research Program, the Astra Research Program or the Astra
Development Program. The Small Molecule Process Flow Schedule is attached hereto
as Appendix C and is hereby incorporated into the Research Program Plan.

     SECTION 1.63. "SUBLICENSEE" means any third party other than an Affiliate
granted the right, subject to the terms and conditions of Article V, to make,
use and sell a Product, but not including a third party that is not granted the
right to make such Product but merely purchases such Product in finished form
(ready pack or in bulk) for resale.

     SECTION 1.64. "TERRITORY" means all countries of the world.

     SECTION 1.65. "VALIDATED PROTEIN" means a Protein encoded by a [**] or
other Protein, the identification of which other Protein was based upon the
identification of a [**], that is suitable for [**] into a [**], as determined
in good faith by the Joint Management Team.

     SECTION 1.66. "VALIDATED TARGET" means a biological molecule that (a) is a
[**], a Protein [**] by a [**] or another qualifying biological molecule in a
relevant [**] of which or the [**] is based upon the identification of a [**],
and (b) that (i) has been configured into a research assay that is suitable for
the [**] and which research assay is (1) a biochemical assay (including without
limitation, a competitive binding assay for a receptor or an enzyme substrate
conversion assay), or (2) a reporter based assay, in either case having a robust
assay readout (such as fluorescence, chemiluminescence, and/or radioactivity)
that has the potential to be configured into a high throughput screen and is
therefore suitable for undertaking research activities to develop a high
throughput screen, or (ii) is suitable for use in [**] or (iii) is suitable for
use in [**] development efforts, all as determined in good


                                       13


<PAGE>   20


faith by the Joint Management Team. Unless stated otherwise, a Validated Target
shall include a Genetics Validated Target.

     SECTION 1.67. "VALID CLAIMS" means any claim(s) pending in a patent
application or in an unexpired patent which has not been held unenforceable,
unpatentable or invalid by a decision of a court or other governmental agency of
competent jurisdiction, unappealable or unappealed within the time allowed for
appeal, and which has not been admitted to be invalid or unenforceable through
reissue or disclaimer.


                                   ARTICLE II

                       RESEARCH AND COLLABORATION PROGRAM

     SECTION 2.1. EXCLUSIVE ARRANGEMENT. During the term of the Millennium
Research Program, Millennium agrees that it shall not participate, either
directly or in collaboration with others in any similar program of genetics and
genomics research relating to the Field except pursuant to the terms of this
Agreement, provided that the foregoing shall not apply to activities in the
Field by Millennium relating to the research, development and commercialization
of (i) Antisense Drugs (subject to the provisions of Section 5.3), (ii) Protein
Drugs, Analog Protein Drugs and Protein Mimic Drugs (subject to the provisions
of Section 5.3), (iii) Gene Therapy Drugs and (iv) Diagnostic Products.

     SECTION 2.2. JOINT MANAGEMENT TEAM. The Parties have established a Joint
Management Team, consisting of four (4) representatives designated by Astra and
four (4) representatives designated by Millennium. Each Party shall cause its
representatives to attend the meetings of the Joint Management Team. If a
representative of a Party is unable to attend a meeting, such Party may
designate an alternate to attend such meeting in place of the missing
representative. In addition, each Party may at its discretion invite non-voting
employees, consultants or scientific advisors to attend the meetings of the
Joint Management Team. The Joint Management Team shall meet no less frequently
than once each calendar quarter, and shall meet at such other times as deemed
appropriate by the Joint Management Team. Each Party may change any one or more
of its representatives to the Joint Management Team at any time upon notice to
the other Party. The location of the Joint Management Team meetings shall
alternate between Massachusetts and Sweden, or as otherwise mutually agreed.

     Each Party shall appoint, and reappoint from time to time as necessary, a
project leader to undertake day to day contact with the other Party.


                                       14


<PAGE>   21


     The Joint Management Team will function during the term of the Research
Program and thereafter for as long as both Parties agree. Upon termination of
the Research Program, the Parties in good faith shall agree upon an alternative
method of communication with regard to the Astra Development Program and the
commercialization of Products.

     SECTION 2.3. JOINT MANAGEMENT TEAM RESPONSIBILITIES.

          (a) The Joint Management Team shall be responsible for coordinating
     and reviewing the activities of the Parties under this Agreement, including
     without limitation the Research Program. Without intending to limit the
     generality of the foregoing, the Joint Management Team shall oversee the
     disclosure and transfer of relevant Know-How to facilitate the research and
     development of Pre-Candidate Genes, Candidate Genes, Validated Targets,
     Validated Proteins, Hits, Leads, Candidate Drugs and Products, as well as
     the disclosure and transfer of Millennium Field Know-How and Millennium
     Core Technology Know-How to Astra pursuant to Article III, and the
     disclosure of Astra Program Know-How to Millennium pursuant to Article III.

          (b) Subject to the minimum funding levels established in Section 8.3,
     the Joint Management Team shall determine the level and extent of research
     work to be conducted by Millennium and funded by Astra under this
     Agreement.

          (c) As soon as practicable after execution of this Agreement, the
     Joint Management Team shall appoint one (1) representative from each Party
     to be responsible for the preparation of a package of information that
     provides all relevant information concerning each gene being pursued under
     the Research Program. The designated representatives shall prepare and
     deliver a copy of the package of information to each member of the Joint
     Management Team at least fifteen (15) days prior to each Joint Management
     Team Meeting.

          (d) As soon as practicable after the execution of this Agreement, the
     Joint Management Team shall agree on the criteria for each stage of the
     Small Molecule Process Flow Schedule. The Joint Management Team shall also
     review each research project being pursued under the Research Program and
     shall assign each gene within each research project to a specific stage of
     the Small Molecule Process Flow Schedule and designate such gene under the
     appropriate definition for such stage.

          (e) The Joint Management Team shall be responsible for the review of
     the results of the Research Program and shall advance genes being pursued
     under the Research Program according to the Small Molecule Process Flow
     Schedule. At each meeting of the Joint Management Team, the representatives


                                       15


<PAGE>   22

     shall discuss all information, provided in accordance with subsection (c)
     above, regarding genes being pursued under the Research Program and shall
     decide whether or not each gene shall be advanced to the next stage of the
     Small Molecule Process Flow Schedule. The Joint Management Team may advance
     a gene to the next stage of the Small Molecule Process Flow Schedule even
     if such gene does not meet all requirements of such next stage.

               (i) Should the Joint Management Team decide that insufficient
          information is available to make a decision to advance a gene to the
          next stage of the Small Molecule Process Flow Schedule based on the
          requirements in the Research Program Plan (as defined in Section 2.6),
          then during the Joint Management Team meeting, the Joint Management
          Team shall determine what additional information is required based
          upon the criteria set forth in the Research Program Plan and such gene
          shall remain at its current stage of discovery until sufficient
          information is available for a decision to be made, PROVIDED, HOWEVER,
          that should the Joint Management Team disagree as to what additional
          information is required or as to whether or not sufficient information
          is available to make a decision with respect to a particular gene,
          then such issue shall be resolved as set forth in Section 2.5.

               (ii) Should the Joint Management Team agree that sufficient
          information is available to make a decision to advance a gene or other
          element of the Small Molecule Process Flow Schedule to the next stage
          of the Small Molecule Process Flow Schedule, but the Parties disagree
          as to whether or not a particular gene or other element of the Small
          Molecule Process Flow Schedule should be advanced to the next stage of
          the Small Molecule Process Flow Schedule, then such issue shall be
          resolved as set forth in Section 2.5, PROVIDED, however, if Astra
          determines that such gene or other element of the Small Molecule
          Process Flow Schedule should not be advanced and if Astra is using
          commercially reasonable efforts to identify and develop at least one
          Product and the sale of such Product developed by Astra will yield
          royalties payable to Millennium by Astra under Section 8.5, then such
          gene or other element of the Small Molecule Process Flow Schedule
          shall not be advanced at that time. Notwithstanding the foregoing,
          should the Joint Management Team disagree as to whether a Candidate
          Gene should be advanced to a Validated Target or a Validated Protein,
          then such issue shall not be resolved as set forth in Section 2.5.
          Rather the issue shall be resolved through the use of an expedited
          arbitration process, in which the Parties first try to agree on a
          mutually accepted scientist to serve as the arbitrator (failing mutual
          agreement on a single scientist, each Party appoints a scientist not
          affiliated with such Party and the two scientists so selected pick a
          third unaffiliated scientist and 


                                       16


<PAGE>   23


                    Confidential Materials omitted and filed
                   separately with the Securities and Exchange
                     Commission. Asterisks denote omissions.

          all three shall serve as arbitrators). The arbitrator(s) shall review
          the disputed matter on an expedited basis (not to exceed forty-five
          (45) days), considering the relevant data, standards established by
          this Agreement and the Research Program and relevant precedents. The
          decision of the arbitrator(s) shall be binding on the Parties.

               (iii) Should the Joint Management Team decide that a
          Pre-Candidate Gene or Candidate Gene shall not be advanced to the next
          stage of the Small Molecule Process Flow Schedule, then all research
          with respect to any such gene shall be suspended. If and when the
          Joint Management Team decides to advance any such gene to the next
          stage of the Small Molecule Process Flow Schedule then active research
          on such gene shall resume.

     SECTION 2.4. GOALS AND OBJECTIVES. As soon as practical after the execution
of this Agreement, the Joint Management Team shall agree on the goals and
objectives and research and development activities of the Research Program,
including the specific research projects to be pursued under the Research
Program. At each meeting of the Joint Management Team, the progress of the
Research Program will be reviewed and if necessary the goals and/or resource
allocation for the Millennium Research Program will be modified. No later than
the end of the first month of each Contract Year during the Millennium Research
Program, the Joint Management Team shall meet to discuss in detail the progress
of the Research Program and agree upon the short- and long-term goals and
prospective budget for the Millennium Research Program. In the event a
significant development occurs which may affect the short-or long-term goals or
resource allocations of the Research Program or methods of achieving said goals,
the Joint Management Team shall reconvene, reassess and change such methods,
resource allocations and/or goals of the Millennium Research Program.

     SECTION 2.5. JOINT MANAGEMENT TEAM DECISIONS. The unanimous agreement of
the members of the Joint Management Team shall be required to take any action,
except as provided below in this Section 2.5. Any member of the Joint Management
Team who is not present at any meeting either in person or by a designated
alternate may appoint another representative or alternate as his proxy to act on
his behalf on all matters coming to a vote. The Joint Management Team may
conduct meetings by telephone or video conference. If the Joint Management Team
is unable to agree with respect to the scope and direction of the Research
Program,[**], subject to Astra's obligation to pay the minimum research funding
in accordance with Section 8.3, provided, however, that in the event that the
Joint Management Team is unable to 


                                       17


<PAGE>   24


                    Confidential Materials omitted and filed
                   separately with the Securities and Exchange
                     Commission. Asterisks denote omissions.


agree with respect to any significant reallocation of Millennium resources or
personnel between or among the projects of the Millennium Research Program,
[**]. (For purposes of this Section 2.5, a reallocation of Millennium resources
and personnel shall be deemed to be significant if more than twenty-five percent
(25%) of the resources and personnel are to be reallocated within any given
calendar year.) If the Joint Management Team is unable to reach a unanimous
agreement on any issue which shall not be decided by Astra or Millennium or as
set forth in Section 2.3(d)(ii), as the case may be, such issue shall be
referred to the Vice President of Pre-Clinical Affairs of Astra AB and the Chief
Executive Officer of Millennium for resolution. If the Vice President of
Pre-Clinical Affairs of Astra AB and the Chief Executive Officer of Millennium
are unable to reach agreement on any issue regarding the Research Program which
shall not be decided by Astra, then such issues shall be submitted to
arbitration pursuant to the provisions set forth in Article XII and the
arbitrators shall have the authority to (i) direct the Parties as to the manner
in which the Parties shall resolve the issue, or (ii) render a final decision
with respect to such issue. The arbitrators shall have no authority to amend
this Agreement or the Research Program Plan (as defined in Section 2.6) and the
budget contained therein.

         SECTION 2.6. RESEARCH PROGRAM PLAN. The Parties shall engage in the
Research Program to expedite the discovery and development of Pre-Candidate
Genes, Candidate Genes, Validated Targets, Validated Proteins, Hits, Leads,
Candidate Drugs and Products in substantial accordance with the research
schedule and goals set forth in the Research Program plan (the "Research Program
Plan"), attached to this Agreement as APPENDIX A (which Research Program Plan is
subject to review and modification by the Joint Management Team and final
resolution by Astra or Millennium, if required, pursuant to Section 2.5).

     SECTION 2.7. TERM OF THE MILLENNIUM RESEARCH PROGRAM.

          (a) Millennium shall conduct the Millennium Research Program for the
     first five (5) Contract Years; provided, however, that Astra may terminate
     the Millennium Research Program by providing notice to Millennium (the
     "Termination Notice") at any time during the two (2) month period following
     the conclusion of the third Contract Year (i.e. during January and
     February, 1999), if, at the conclusion of the third Contract Year, the Year
     3 Success Benchmark (as defined below) has not been achieved. As used
     herein, the term "Year 3 Success Benchmark" means that [**] in each case as
     determined in good faith by the Joint Management Team. The Parties hereby
     agree that the Year 3 Success Benchmark has been achieved.


                                       18


<PAGE>   25


          (b) As Millennium has achieved the Year 3 Success Benchmark, Astra
     shall choose either (i) to let the Millennium Research Program continue for
     the remainder of its five (5) year term, or (ii) to extend the Millennium
     Research Program for an additional two (2) Contract Years beyond the
     original five (5) year term to a term of seven (7) Contract Years. Astra
     elects to extend the Millennium Research Program for an additional two (2)
     Contract Years, for a total term of seven (7) Contract Years (i.e. up to
     and including December 31, 2002), with Astra having the option to terminate
     the Millennium Research Program after the fifth Contract Year as set forth
     in Section 2.7(c). Astra shall pay to Millennium the additional fee subject
     to and as set forth in Sections 8.2(a) and 8.2(b). Astra shall fund the
     fourth through seventh Contract Years at the levels set forth in Section
     8.3(a) (iii) subject to Section 2.7(c).

          (c) Astra shall have the option to terminate the Millennium Research
     Program after the fifth Contract Year as follows. Three (3) months prior to
     the conclusion of the fifth Contract Year, Astra shall notify Millennium in
     writing of its decision (the "Astra Decision") to either (i) terminate the
     Millennium Research Program at the end of the fifth Contract Year and pay
     to Millennium the additional fee set forth in Section 8.2(c), or (ii)
     continue the Millennium Research Program for a total of seven (7) Contract
     Years and no additional fee shall be due to Millennium. Should the Astra
     Decision be to continue the Millennium Research Program for a total of
     seven (7) Contract Years, and the Parties have achieved the Year 5 Success
     Benchmark (as defined below), then the Millennium Research Program shall
     continue for a total of seven (7) Contract Years. Should the Astra Decision
     be to continue the Millennium Research Program for a total of seven (7)
     Contract Years, and the Parties have not achieved the Year 5 Success
     Benchmark (as defined below), then Millennium shall have the right,
     exercisable within thirty (30) days after receipt of the Astra Decision, to
     elect to discontinue the Millennium Research Program at the conclusion of
     the fifth Contract Year, subject to Astra's option set forth in Section
     2.7(d) below. As used herein, the term "Year 5 Success Benchmark" means
     that (A) at least five (5) Validated Targets have been identified and
     entered into small molecule high throughput screening, and (B) Astra is
     diligently pursuing Hits identified by small molecule high throughout
     screening as determined in good faith by the Parties. Upon the
     recommendation of the Joint Management Team, based upon the allocation of
     resources to and prioritization of work within the Millennium Research
     Program, Millennium and Astra may agree to other objectives, as
     alternatives to the objectives stated in (A) and (B) of the preceding
     sentence, to be included in the Year 5 Success Benchmark.

          (d) If Millennium elects to discontinue the Millennium Research
     Program under the provisions of Section 2.7(c), then at Astra's option, the


                                       19


<PAGE>   26


     Millennium Research Program shall continue for a period of two (2) Contract
     Years with the following modifications: (1) Millennium shall be obligated
     to continue only the existing genetics research program under the
     Millennium Research Program which is directed at the identification of
     Genetics Candidate Genes and Genetics Validated Targets and shall not be
     obligated to undertake any new program of genetics research; (2) the
     provisions of Section 8.3(a)(iii) and 8.3(a)(iv) shall be deemed amended
     such that the Millennium Research Program shall be funded by Astra at an
     FTE level which is the average number of FTEs during the fourth and fifth
     Contract Years who conducted the research directed at the identification of
     Genetics Candidate Genes and Genetics Validated Targets; (3) Astra shall
     fund such FTEs at the FTE Rate set forth in Section 8.3(a)(i); (4) any
     change in the number of FTEs engaged in such research may be made only by
     consensus agreement of the Joint Management Team; (5) Section 8.3(a)(vi)
     shall be amended to read in its entirety as follows, "Astra shall reimburse
     Millennium for all third party collaborative research expenses incurred by
     Millennium in support of the Millennium Research Program such expenses
     subject to the prior approval of the Joint Management Team"; (6) the
     Millennium Research Program and the Research Program shall be deemed
     terminated at the end of the fifth Contract Year for all purposes under
     Section 1.11(b), Section 1.28, Section 1.41, and Section 2.1; (7) the
     Millennium Research Program and the Research Program shall be deemed to be
     continued for the purposes of Section 1.5, Section 2.9 and Section 4.4; and
     (8) for the purposes of the sixth and seventh Contract Years all other
     Sections shall be amended such that the Millennium Research Program shall
     be limited to consist of the research directed at the identification of
     Genetics Candidate Genes and Genetics Validated Targets; such Sections
     include without limitation Section 1.6, Section 1.7, Section 1.8, Section
     1.17, Section 1.31, Section 1.33, Section 2.8, Section 3.1, Section 3.2,
     Section 3.3, Section 5.6, Section 7.1, Section 7.4, and Section 7.6 (for
     the purposes of clarity, (i) Astra's rights under Section 5.6 with respect
     to all Pre-Candidate Genes and Candidate Genes, that are not Genetics
     Candidate Genes, shall expire ninety (90) days following the end of the
     fifth Contract Year; (ii) Astra's diligence obligations set forth in
     Sections 7.1 and 7.4 with respect to all Candidate Genes, Validated
     Proteins and Validated Targets which are not Genetics Candidate Genes and
     Genetics Validated Targets shall commence at the end of the fifth Contract
     Year; and (iii) Millennium's rights set forth in Section 7.6 with respect
     to Niche Products which do not involve the use of a Genetics Candidate Gene
     or a Genetics Validated Target shall commence at the end of the fifth
     Contract Year).

     SECTION 2.8. DILIGENCE. Millennium shall, in the course of the Millennium
Research Program: (a) use reasonable efforts in pursuing and conducting research
and development of all Candidate Genes, Validated Targets, Validated Proteins
and related assays; (b) furnish, maintain and preserve suitable and sufficient
laboratory 


                                       20


<PAGE>   27


facilities, equipment and personnel for the research and development
to be undertaken by Millennium; (c) perform its obligations hereunder in good
faith in a scientifically/commercially reasonable and workmanlike manner; (d)
use reasonable efforts to carry out all work in compliance with any federal,
state or local laws, regulations and guidelines governing the conduct of such
work; and (e) cooperate with Astra in good faith, particularly with respect to
unknowns or contingencies.

     SECTION 2.9. SMALL MOLECULE HIGH THROUGHPUT SCREENING. During the term of
the Research Program, Astra shall have the option to engage Millennium to
configure and/or implement high throughput screening for small molecule agonists
and/or antagonists of any Validated Target. Astra shall exercise this option by
providing to Millennium, in writing, a request that Millennium configure and/or
implement small molecule high throughput screening of a stated Validated Target
and shall state the desired compound libraries (Millennium compound libraries
and/or Astra compound libraries) to be screened. If Astra compound libraries are
to be screened, then Astra shall provide to Millennium such compound libraries
in an appropriate format for use by Millennium in such screening. If Millennium
compound libraries are to be screened at Astra, then Millennium shall provide to
Astra such compound libraries in an appropriate format for use by Astra in such
screening. If Millennium agrees to configure and/or implement a small molecule
high throughput screening of a Validated Target, then Millennium shall provide
to Astra an estimate of the fully burdened cost for such screening. If, after
receipt of Millennium's estimate of the fully burdened cost for such screening,
Astra engages Millennium, then Millennium shall perform the agreed upon work.
Astra shall compensate Millennium for such configuration and/or implementation
of small molecule high throughput screening at Millennium's fully burdened cost
which shall not exceed the Millennium estimated cost by more than ten percent
(10%) unless otherwise agreement by the parties in writing.

                                   ARTICLE III

                             DISCLOSURE OF KNOW-HOW

     SECTION 3.1. MILLENNIUM KNOW-HOW. Commencing with the execution of this
Agreement, Millennium shall disclose to Astra all existing Millennium Field
Know-How which Millennium reasonably believes to be pertinent to the Research
Program or which is reasonably requested by Astra, and all Millennium Core
Technology Know-How which Millennium reasonably believes to be pertinent to the
exercise of the licenses granted in Section 5.1 or which is reasonably requested
by Astra. Millennium shall disclose to Astra on an ongoing basis for the
duration of the Millennium Research Program (i) all additional Millennium Field
Know-How which Millennium reasonably believes to be pertinent to the successful
execution of the Research Program or which is reasonably requested by Astra, and
(ii) all additional Millennium Core Technology Know-How which Millennium
reasonably believes to 


                                       21


<PAGE>   28


be pertinent to the exercise of the licenses granted in Section 5.1 or which is
reasonably requested by Astra. Notwithstanding the foregoing, Millennium need
not disclose to Astra any Know-How which Millennium is precluded from disclosing
under any agreement binding upon it pursuant to any of the agreements listed in
APPENDIX B, as amended by Millennium from time to time, PROVIDED, HOWEVER, that
(a) Millennium shall not, without the prior written consent of Astra, enter into
any future agreement with a third party relating to the Millennium Field
Know-How which would limit the ability of Millennium to disclose Millennium
Field Know-How to Astra pursuant to the provisions of this Agreement or is
otherwise inconsistent with the licenses granted by Millennium to Astra in the
Field under this Agreement, and (b) Millennium shall not, without the prior
written consent of Astra, enter into any future agreement with a third party
relating to the Millennium Core Technology Know-How which limits Millennium's
right to utilize Millennium Core Technology Know-How in the Millennium Research
Program.

     SECTION 3.2. BIOLOGICAL MATERIALS. Millennium shall also provide Astra with
Millennium Field Know-How in the form of genes, gene fragments, vectors, cell
lines, strains, transgenic organisms, model organisms, DNA and DNA fragments and
other biological materials, as well as information relating to such materials,
which Millennium reasonably believes to be pertinent to Astra's activities in
the Research Program and the Astra Development Program or which is reasonably
requested by Astra. Notwithstanding the foregoing, Millennium need not provide
Astra with any such biological materials or related information which Millennium
is precluded from providing under any agreement binding upon it pursuant to any
of the agreements listed in APPENDIX B, as amended by Millennium from time to
time, PROVIDED, HOWEVER, that Millennium shall not, without the prior written
consent of Astra, enter into any future agreement with a third party relating to
the Millennium Field Know-How which would limit the ability of Millennium to
provide Astra, pursuant to this Section 3.2, with the biological materials and
related information which Millennium reasonably believes to be pertinent to
Astra's activities in the Research Program and the Astra Development Program.

     SECTION 3.3. ASTRA PROGRAM KNOW-HOW. Astra shall disclose to Millennium
such Astra Program Know-How which Astra reasonably believes is needed by
Millennium to carry out its obligations within the Millennium Research Program
hereunder; PROVIDED, HOWEVER, that Astra need not disclose to Millennium any
Astra Program Know-How which Astra is precluded from disclosing under any
agreement binding upon it. Millennium's right to use Astra Program Know-How
shall be limited to the Millennium Research Program.


                                       22


<PAGE>   29


                                   ARTICLE IV

                                 CONFIDENTIALITY

     SECTION 4.1. CONFIDENTIAL INFORMATION AND KNOW-HOW. All Know-How or other
Confidential Information disclosed by one Party to the other during the term of
this Agreement shall not be used by the receiving Party except in connection
with the Research Program or the identification, selection, preparation,
development, manufacture or sale of Products (or, in the case of Millennium Core
Technology Know-How, for permitted uses outside the Field), shall be maintained
in confidence by the receiving Party (except to the extent reasonably necessary
for regulatory approval of Products developed by Astra), and shall not otherwise
be disclosed by the receiving Party to any other person, firm, or agency,
governmental or private, without the prior written consent of the disclosing
Party, except to the extent that the

          (a) was known or used by the receiving Party prior to its date of
     disclosure to the receiving Party; or

          (b) either before or after the date of the disclosure to the receiving
     Party is lawfully disclosed to the receiving Party by sources other than
     the disclosing Party rightfully in possession of the Confidential
     Information; or

          (c) either before or after the date of the disclosure to the receiving
     Party becomes published or generally known to the public, other than
     through the sale of Products in the ordinary course, through no fault or
     omission on the part of the receiving Party or its Sublicensees; or

          (d) is independently developed by or for the receiving Party without
     reference to or reliance upon the Confidential Information; or

          (e) is required to be disclosed by the receiving Party to comply with
     applicable laws, to defend or prosecute litigation or to comply with
     governmental regulations, PROVIDED, THAT the receiving Party provides prior
     written notice of such disclosure to the other Party and takes reasonable
     and lawful actions to avoid and/or minimize the degree of such disclosure.

     SECTION 4.2. EMPLOYEE OBLIGATIONS. Millennium and Astra each agree that it
shall provide Know-How and other Confidential Information received from the
other Party only to its employees, consultants and advisors who have a need to
know and have an obligation to treat such information and materials as
confidential.


                                       23


<PAGE>   30


     SECTION 4.3. PUBLICATIONS. The Parties acknowledge that scientific lead
time is a key element of the value of the research to be performed under this
Agreement and further agree that scientific publications must be strictly
monitored to prevent any adverse effect of premature publication of results of
the Research Program. The Joint Management Team will establish a procedure for
publication review and approval and each Party shall first submit to the other
Party an early draft of all such publications, whether they are to be presented
orally or in written form, at least sixty (60) days prior to submission for
publication. Each Party shall review each such proposed publication in order to
avoid the unauthorized disclosure of a Party's Confidential Information and to
preserve the patentability of inventions arising from the research performed in
the course of the Research Program and/or the Astra Development Program. If, as
soon as reasonably possible but no longer than sixty (60) days following receipt
of an advance copy of a Party's proposed publication, the other Party informs
such Party that its proposed publication contains Confidential Information of
the other Party, then such Party shall delete such Confidential Information from
its proposed publication. If, as soon as reasonably possible but no longer than
sixty (60) days following receipt of an advance copy of a Party's proposed
publication, the other Party informs such Party that its proposed publication
could be expected to have a material adverse effect on any Program Patent Rights
or Program Know-How, then such Party shall delay such proposed publication,
sufficiently long to permit the timely preparation, first filing, international
filing and publication of patent application(s) on the information involved,
PROVIDED, HOWEVER, that (i) with respect to any agreement between Millennium and
a third party listed in APPENDIX B as of the Effective Date (and any extension
thereof), the terms and conditions of such agreement (and any extensions
thereof) that govern the review, approval and delay of any scientific
publications relating to such agreement shall remain in full force and effect
notwithstanding any provision of this Section 4.3 to the contrary, and (ii) with
respect to any future agreement entered into by Millennium with a third party
relating to the Millennium Field Patent Rights and/or the Millennium Field
Know-How, Millennium shall not agree to any terms and conditions governing the
review, approval and delay of scientific publications that are inconsistent with
those set forth in this Section 4.3, without the prior written consent of Astra.

     SECTION 4.4. TERM. All obligations of confidentiality and non-use imposed
under this Article IV shall expire ten (10) years following termination of the
Millennium Research Program.


                                       24


<PAGE>   31


                    Confidential Materials omitted and filed
                   separately with the Securities and Exchange
                     Commission. Asterisks denote omissions.

                                    ARTICLE V

                                 GRANT OF RIGHTS

     SECTION 5.1. LICENSES TO MILLENNIUM CORE TECHNOLOGY. Subject to the terms
and conditions of this Agreement, Millennium hereby grants to Astra:

          (a) a fully paid-up, non-royalty bearing (other than with respect to
     Products as provided in Section 8.5), non-exclusive right and license in
     the Territory, without the right to grant sublicenses, under Millennium
     Core Technology Patent Rights and Millennium Core Technology Know-How [**]
     within and outside the Field during the term of the Research Program and
     thereafter;

          (b) a fully-paid up, non-royalty bearing (other than with respect to
     Products as provided in Section 8.5), non-exclusive right and license,
     without the right to grant sublicenses, under any applicable Millennium
     copyright to copy and use in the Territory all computer software included
     in Millennium Core Technology, in object code form only, provided to Astra
     by Millennium during the term of the Millennium Research Program for
     Astra's own use only, inside and outside the Field, during and after the
     term of the Research Program.

     SECTION 5.2. LICENSES TO MILLENNIUM FIELD PATENT RIGHTS AND MILLENNIUM
FIELD KNOW-HOW FOR RESEARCH PURPOSES. Subject to the terms and conditions of
this Agreement, Millennium hereby grants to Astra a fully paid-up, non-royalty
bearing (other than with respect to Products as provided in Section 8.5),
co-exclusive (with Millennium and its permitted licensees pursuant to this
Article V), right and license, without the right to grant sublicenses, under
Millennium Field Patent Rights and Millennium Field Know-How, to make and use
Pre-Candidate Genes, Candidate Genes, Validated Targets and Validated Proteins
in the Territory to research and develop Products in accordance with the terms
of this Agreement.

     SECTION 5.3. PRODUCT LICENSES.

          (a) PRODUCTS THAT COMPRISE A PROGRAM SMALL MOLECULE DRUG, A RELATED
     SMALL MOLECULE DRUG, A PROGRAM PEPTIDO MIMETIC DRUG, A RELATED PEPTIDO
     MIMETIC DRUG OR A MODIFIED DRUG.


                                       25


<PAGE>   32

                    Confidential Materials omitted and filed
                   separately with the Securities and Exchange
                     Commission. Asterisks denote omissions.

          (i) Subject to the terms and conditions of this Agreement, Millennium
     hereby grants to Astra an exclusive, royalty bearing license, under
     Millennium Field Patent Rights and Millennium Field Know-How, to research,
     have researched, develop, have developed, make, have made, import, use,
     have used, offer to sell, sell and have sold, within the Field in the
     Territory, Products that comprise a Program Small Molecule Drug, a Related
     Small Molecule Drug, a Program Peptido Mimetic Drug, a Related Peptido
     Mimetic Drug or a Modified Drug. Such license shall include the right to
     grant sublicenses, on notice to Millennium as soon as reasonably possible,
     to make or have made, import, use or have used (other than to research,
     have researched, develop or have developed), offer to sell, sell or have
     sold such Products within the Field in the Territory. Astra shall be
     responsible for all obligations of Astra's Sublicensees hereunder, and
     guarantees to Millennium the performance of all such obligations. The
     payment of royalties on Net Sales of Products shall remain a direct
     obligation of Astra, regardless of whether sales are made by Astra or an
     Astra Sublicensee.

          (ii) In the event that [**] that comprises a [**] for use in the [**]
     (as evidenced by the designation of such [**] or [**]), then [**] granted
     in Section [**] shall be deemed to include the [**] contained within such
     Product, or any [**] or any [**] corresponding to the [**] or [**]
     contained within such Product, for any [**], subject to the [**] pursuant
     to Section 8.5.

     (b) PRODUCTS THAT COMPRISE A PROGRAM ANTISENSE DRUG, A RELATED ANTISENSE
DRUG OR A PROGRAM PROTEIN MIMIC DRUG.

          (i) During the term of the Research Program and the Astra Development
     Program, Millennium and Astra agree to discuss collaborations concerning
     the development and commercialization of Products that comprise a Program
     Antisense Drug, a Related Antisense Drug or a Program Protein Mimic Drug
     for use in the Field. The initial opportunity to begin such discussions
     concerning such therapeutic Products shall arise when, in the course of the
     Research Program, either Party recognizes the possibility for developing
     such a therapeutic Product or collaborating with a commercial third party
     who possesses technology relevant to the development of such a therapeutic
     Product. When this occurs, the Party recognizing such possibility shall
     present 


                                       26


<PAGE>   33


     such information to the other Party and the Parties shall have a period of
     sixty (60) days in which to decide whether to begin good faith negotiations
     with each other concerning a potential collaboration, it being understood
     that NEITHER Party shall have any obligation to enter into such
     negotiations. If the Parties decide to collaborate, the terms of such
     collaboration shall be governed by the terms and conditions of a separate
     agreement to be negotiated in good faith by the Parties.

          (ii) If either (A) the Parties choose not to negotiate with each other
     concerning a collaboration regarding a Product that comprises a Program
     Antisense Drug, a Related Antisense Drug or a Program Protein Mimic Drug,
     or (B) the Parties cannot agree to the terms of a collaboration regarding
     such a therapeutic Product, then Millennium shall grant to Astra (1) an
     exclusive license under the Millennium Field Patent Rights and the
     Millennium Field Know-How to research, have researched, develop, have
     developed, make, have made, import, use, have used, offer to sell, sell and
     have sold, within the Field in the Territory, any such Product that
     comprises a Program Antisense Drug, a Related Antisense Drug or a Program
     Protein Mimic Drug that is administered by Airway Delivery, with the right
     to grant sublicenses, on prior notice to Millennium, to make or have made,
     import, use or have used (other than to research, have researched, develop
     or have developed), offer to sell, sell or have sold any such Product
     within the Field in the Territory, (2) a co-exclusive license under the
     Millennium Field Patent Rights and the Millennium Field Know-How to
     develop, have developed, make, have made, import, use, have used, offer to
     sell, sell and have sold outside the Field in the Territory, any Product
     that comprises a Program Antisense Drug, a Related Antisense Drug or a
     Program Protein Mimic Drug that is administered by Airway Delivery for
     which Astra or its permitted sublicensee has commenced a bona fide clinical
     investigation for Airway Delivery of such Product for an indication within
     the Field in the Territory, and (3) a co-exclusive license under the
     Millennium Field Patent Rights and the Millennium Field Know-How to
     research, have researched, develop, have developed, make, have made,
     import, use, have used, offer to sell, sell and have sold, within the Field
     in the Territory, any such Product that comprises a Program Antisense Drug
     or a Related Antisense Drug that is administered by any means other than
     Airway Delivery, with the right to grant sublicenses, on prior notice to
     Millennium, to make or have made, import, use or have used (other than to
     research, have researched, develop or have developed), offer to sell, sell
     or have sold any such Product within the Field in the Territory. Astra
     shall be responsible for all obligations of Astra's Sublicensees hereunder,
     and guarantees to Millennium the performance of all such obligations. The
     

                                       27


<PAGE>   34


     payment of royalties on Net Sales of Products shall remain a direct
     obligation of Astra, regardless of whether sales are made by Astra or an
     Astra Sublicensee. Millennium shall have (w) the co-exclusive right, either
     alone or in collaboration with others, to research, have researched,
     develop, have developed, make, have made, import, use, have used, offer to
     sell, sell and have sold, within the Field in the Territory, any Product
     that comprises a Program Antisense Drug or a Related Antisense Drug that is
     administered by any means other than Airway Delivery; (x) the exclusive
     right, either alone or in collaboration with others, to research, have
     researched, develop, have developed, make, have made, import, use, have
     used, offer to sell, sell and have sold, within the Field in the Territory,
     any Product that comprises a Program Protein Mimic Drug that is
     administered by any means other than Airway Delivery; (y) the exclusive
     right, either alone or in collaboration with others, to research, have
     researched, develop, have developed, make, have made, import, use, have
     used, offer to sell, sell and have sold, outside the Field in the
     Territory, any Product that comprises a Program Antisense Drug, a Related
     Antisense Drug or Program Protein Mimic Drug that is administered by any
     means other than Airway Delivery; and (z) the exclusive right, either alone
     or in collaboration with others, to research, have researched, develop,
     have developed, make, have made, import, use, have used, offer to sell,
     sell and have sold, outside the Field in the Territory, any Product that
     comprises a Program Antisense Drug, a Related Antisense Drug or Program
     Protein Mimic Drug that is administered by Airway Delivery UNLESS Astra or
     its permitted sublicensee has commenced a bona fide clinical investigation
     for Airway Delivery of such Product for an indication within the Field in
     the Territory in which case Millennium's right shall be co-exclusive with
     Astra.

     (c) RIGHT OF FIRST NEGOTIATION FOR PRODUCTS THAT COMPRISE A PROGRAM PROTEIN
DRUG OR PROGRAM ANALOG PROTEIN DRUG.

          (i) During the term of the Research Program and the Astra Development
     Program, Astra shall have a right of first negotiation for collaborations
     concerning the development and commercialization of Products that comprise
     a Program Protein Drug or a Program Analog Protein Drug for use in the
     Field. The initial opportunity to begin such discussions concerning such
     therapeutic Products shall arise when, in the course of the Research
     Program, either Party recognizes the possibility for developing such a
     therapeutic Product or collaborating with a commercial third party who
     possesses technology relevant to the development of such a therapeutic
     Product. When this occurs, the Party recognizing such possibility shall
     present such information to the other 


                                       28


<PAGE>   35


          Party and Astra shall have a period of sixty (60) days in which to
          decide whether to begin good faith negotiations with Millennium
          concerning a potential collaboration. During such sixty (60) day
          period, Millennium shall not enter into an agreement with a commercial
          third party concerning such collaboration. If Astra elects to enter
          into good faith negotiations with Millennium, then the Parties shall
          have sixty (60) days within which to enter into a definitive agreement
          for such collaboration. During this sixty (60) day period, Millennium
          shall not enter into an agreement with a commercial third party
          concerning such collaboration.

               (ii) If either (A) Astra chooses not to negotiate with Millennium
          concerning a collaboration regarding a Product that comprises a
          Program Protein Drug or a Program Analog Protein Drug, or (B) if the
          Parties cannot agree to the terms of a collaboration regarding such a
          therapeutic Product, then Millennium shall grant to Astra: (1) an
          exclusive license under the Millennium Field Patent Rights and the
          Millennium Field Know-How to research, have researched, develop, have
          developed, make, have made, import, use, have used, offer to sell,
          sell and have sold, within the Field in the Territory, any such
          Product that comprises a Program Protein Drug or a Program Analog
          Protein Drug that is administered by Airway Delivery, and (2) a
          co-exclusive license under the Millennium Field Patent Rights and the
          Millennium Field Know-How to develop, have developed, make, have made,
          import, use, have used, offer to sell, sell and have sold, outside the
          Field in the Territory, any such Product that comprises a Program
          Protein Drug or a Program Analog Protein Drug that is administered by
          Airway Delivery for which Astra or its permitted sublicensee has
          commenced a bona fide clinical investigation for Airway Delivery of
          such Product for an indication within the Field in the Territory; in
          each case with the right to grant sublicenses, on prior notice to
          Millennium, to make or have made, import, use or have used (other than
          to research, have researched, develop or have developed), offer to
          sell, sell or have sold any such Product within the Field in the
          Territory. Astra shall be responsible for all obligations of Astra's
          Sublicensees hereunder, and guarantees to Millennium the performance
          of all such obligations. The payment of royalties on Net Sales of
          Products shall remain a direct obligation of Astra, regardless of
          whether sales are made by Astra or an Astra Sublicensee. Millennium
          shall have (x) the exclusive right, either alone or in collaboration
          with others, to research, have researched, develop, have developed,
          make, have made, import, use, have used, offer to sell, sell and have
          sold, within the Field in the Territory, any Product that comprises a
          Program Protein Drug or a Program Analog Protein Drug that is
          administered by any means other than Airway Delivery; (y) the
          exclusive right, either alone or in collaboration with


                                       29


<PAGE>   36


          others, to research, have researched, develop, have developed, make,
          have made, import, use, have used, offer to sell, sell and have sold,
          outside the Field in the Territory, any Product that comprises a
          Program Protein Drug or a Program Analog Protein Drug that is
          administered by any means other than Airway Delivery; and (z) the
          exclusive right, either alone or in collaboration with others, to
          research, have researched, develop, have developed, make, have made,
          import, use, have used, offer to sell, sell and have sold, outside the
          Field in the Territory, any Product that comprises a Program Protein
          Drug or a Program Analog Protein Drug that is administered by Airway
          Delivery UNLESS Astra or its permitted sublicensee has commenced a
          bona fide clinical investigation for Airway Delivery of such Product
          for an indication within the Field in the Territory in which case
          Millennium's right shall be co-exclusive with Astra.

     SECTION 5.4. MILLENNIUM'S RETAINED RIGHTS. Any of Millennium's rights to
Millennium Field Know-How, Millennium Field Patent Rights, Millennium Core
Technology Know-How and Millennium Core Technology Patent Rights not
specifically licensed to Astra pursuant to this Article V shall be retained by
Millennium, including without limitation (a) Millennium's exclusive right to
make, have made, use, and have used Pre-Candidate Genes, Candidate Genes,
Validated Targets and Validated Proteins in the Territory to research and
develop pharmaceutical products for use outside the Field except for Products
that comprise (i) a Program Small Molecule Drug, a Related Small Molecule Drug,
a Program Peptido Mimetic Drug, a Related Peptido Mimetic Drug or a Modified
Drug, or (ii) a Program Antisense Drug, a Related Antisense Drug, a Program
Protein Mimic Drug, a Program Protein Drug, or a Program Analog Protein Drug if
Astra has commenced a bona fide clinical investigation for Airway Delivery of
any such Product for an indication in the Field in which case Millennium shall
have a co-exclusive right with Astra for Airway Delivery of such Products
outside the Field, and (b) Millennium's exclusive right to research, have
researched, develop, have developed, make, have made, import, use, have used,
offer to sell, sell and have sold, within and outside the Field in the
Territory, (i) any Small Molecule Drug (subject to the provisions of Section 5.5
with respect to a Millennium Drug), Peptido Mimetic Drug (subject to the
provisions of Section 5.5 with respect to a Millennium Drug), Antisense Drug,
Protein Drug, Analog Protein Drug and/or Protein Mimic Drug, in each case, that
is owned or otherwise controlled by Millennium and that is not a Product, and
(ii) any Gene Therapy Drug and/or Diagnostic Product that is owned or otherwise
controlled by Millennium.

     SECTION 5.5. MILLENNIUM DRUGS. Millennium shall retain the right to exploit
Millennium Field Know-How and any other Know-How developed by Millennium in the
course of the Research Program to develop and use, whether alone or in
collaboration with third parties, compound screens that embody or are based on


                                       30


<PAGE>   37
                         Confidential Materials omitted and filed
                       separately with the Securities and Exchange
                        Commission. Asterisks denote omissions.

Validated Targets that result from the Millennium Research Program (the
"Millennium Compound Screens"). In the event that as part of its efforts to
develop Millennium Drugs, Millennium transfers a Millennium Compound Screen to a
third party for the purpose of such third party conducting screening efforts at
its facility (a "Third Party Offsite Screening Program"), Millennium shall
notify Astra in writing of such arrangement and provide written evidence that
such third party has no right either to develop or otherwise commercialize any
resulting Millennium Drug in the Field or to further sublicense rights to use
the Millennium Compound Screen to another third party. The foregoing
notwithstanding, [**](as defined below) to undertake a [**]. As used herein, a
[**] shall mean a [**] by the [**] in its then most current survey among the
[**] derived from the [**].

     Millennium shall retain the exclusive right to research, have researched,
develop, have developed, make, have made, import, use, have used, offer to sell,
sell and have sold, any Millennium Drug outside the Field in the Territory,
either alone or in collaboration with others. In the event that, during the term
of the Millennium Research Program or the Astra Development Program, a
Millennium Drug owned, licensed with the right to grant sublicenses, or
otherwise controlled by Millennium is identified to have potential as a
therapeutic product within the Field, then Millennium shall (a) inform Astra of
the existence and potential utility in the Field of such Millennium Drug and (b)
at Astra's request, enter into discussions with Astra regarding the possibility
of a collaboration between Millennium and Astra concerning the research,
development and/or commercialization of such Millennium Drug within the Field.
Millennium shall not, either alone or in collaboration with a third party, make,
have made, import, use, have used, offer to sell, sell, or have sold such
Millennium Drug within the Field in the Territory, without the prior written
consent of Astra.

     In the event that Astra is unable to fully exploit its rights to
commercialize Products within the Field in the Territory, as set forth in
Section 5.3(a)(i), without infringing an intellectual property right that
relates to a Millennium Drug and is owned by, licensed to (with the right to
grant sublicenses) or otherwise controlled by Millennium, Millennium shall grant
to Astra a license (or sublicense) under such intellectual property right to the
extent necessary to enable Astra to fully exploit its rights as set forth in
Section 5.3(a)(i); such license (or sublicense) shall not impose on Astra any
additional financial obligations beyond those otherwise provided for herein.

     SECTION 5.6. RIGHTS TO POTENTIAL CANDIDATE GENES, VALIDATED TARGETS AND
VALIDATED PROTEINS. Within [**] following the expiration of the Millennium
Research 


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Program, Astra may designate any Pre-Candidate Gene or Candidate Gene as a
Validated Target and/or a Validated Protein, PROVIDED, HOWEVER, that at the time
of such designation(s) Astra shall pay to Millennium the following milestone
payment(s): (a) two hundred thousand dollars ($200,000) for the first such
designated Validated Target or Validated Protein; (b) three hundred and fifty
thousand dollars ($350,000) for the second such designated Validated Target or
Validated Protein; (c) three hundred and fifty thousand dollars ($350,000) for
the third such designated Validated Target or Validated Protein; and (d) five
hundred thousand dollars ($500,000) for each additional designated Validated
Target or Validated Protein. Upon any such designation(s), each designated
Validated Target and/or Validated Protein shall be subject to all terms and
conditions of this Agreement that relate to any Validated Target and/or
Validated Protein.

     SECTION 5.7. ASTRA'S RIGHTS TO DIAGNOSTIC PRODUCTS NOT BEING COMMERCIALIZED
BY MILLENNIUM. Notwithstanding Millennium's exclusive rights to Diagnostic
Products set forth in Section 5.4, if Astra is developing a Product for which it
is necessary or useful to develop a Diagnostic Product to ascertain the
predisposition of an individual to respond favorably or unfavorably to the
administration of such Product (for example, where (a) the United States Food
and Drug Administration (or a comparable regulatory authority in another
country) requires that an individual be tested with a Diagnostic Product prior
to the administration of the associated Product, as a condition of registering
and approving for commercial sale such Product, or (b) it is determined, in the
reasonable judgment of Astra (based on written information that is made
available to Millennium), that a Diagnostic Product must be marketed and sold
with such Product in order for such Product to achieve significant market
penetration in the Territory), and Millennium is unwilling or unable to develop
and commercialize such Diagnostic Product either alone or in collaboration with
a third party, then Astra shall have the right to develop and commercialize a
Diagnostic Product, either alone or in collaboration with a third party, that is
based on polymorphisms of a Genetics Candidate Gene or Validated Target under
the terms set forth in a separate agreement.

                                   ARTICLE VI

                PATENT OWNERSHIP, PROTECTION AND RELATED MATTERS

     SECTION 6.1. OWNERSHIP. Astra shall own all inventions within the scope of
the Research Program or the Astra Development Program made solely by its
employees, and Millennium shall own all inventions within the scope of the
Research Program made solely by its employees. All inventions made jointly by
employees of Astra and employees of Millennium shall be owned jointly by Astra
and Millennium. All patent applications and patents covering any invention made
within the scope of the 


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Research Program or the Astra Development Program shall be owned by the Parties
or Party, as the case may be, that own(s) said invention.

     SECTION 6.2. PATENTABLE INVENTIONS.

          (a) If a patentable invention related to the Field is (i) conceived or
     reduced to practice prior to the Effective Date and included within
     Millennium Field Patent Rights, or (ii) conceived in the course of and
     within the scope of the Research Program and is reduced to practice within
     the course of the Research Program or the Astra Development Program (with
     respect to either subsection (i) or (ii), a "Section 6.2 Invention"), Astra
     and Millennium shall discuss that invention and the desirability of filing
     a United States patent application covering such invention, as well as any
     foreign counterparts. The Party owning the Section 6.2 Invention
     (determined in accordance with Section 6.1) shall make the final decision
     with respect to any such filings. If a Section 6.2 Invention is made
     jointly, the Joint Management Team shall determine which Party shall file
     and prosecute the application. If either (1) the Joint Management Team is
     unable to make such a determination or (2) no decision is made regarding
     which Party shall file and prosecute the application covering such jointly
     owned invention, then in the event such jointly made invention relates to a
     (i) Candidate Gene, Validated Target, Validated Protein, Millennium Drug,
     Gene Therapy Drug or Diagnostic Product, Millennium shall have the first
     option to file and prosecute the application for such jointly made
     inventions, and (ii) Modified Drug, Program Small Molecule Drug, Related
     Small Molecule Drug, Program Peptido Mimetic Drug, Related Peptido Mimetic
     Drug, Program Antisense Drug, Related Antisense Drug, Program Protein Drug,
     Program Analog Protein Drug or Program Protein Mimic Drug, Astra shall have
     the first option to file and prosecute the application for such jointly
     made invention. In the event that either Party declines the option to file
     and prosecute any such patent application for such jointly made invention,
     the Party not having such option may, upon written notice to the other
     Party, file and prosecute the application for such jointly made inventions.

          (b) Subject to (i) the grant of licenses to Astra under Article V,
     (ii) the limitations on Astra's rights outside the Field, (iii) the
     retained rights of Millennium and (iv) Astra's royalty payment obligations
     for Products under Article VIII, each Party shall be free to use jointly
     owned patents within the Territory without restriction and without payment
     of any additional compensation to the other Party.

     SECTION 6.3. REVIEW AND COMMENT. Each Party shall provide the other Party
with a copy of any patent application which first discloses any Section 6.2
Invention prior to filing the first of such applications in any jurisdiction, if
possible, for review 


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                    Confidential Materials omitted and filed
                   separately with the Securities and Exchange
                     Commission. Asterisks denote omissions.

and comment by such other Party, which shall maintain any
such patent application in confidence, pursuant to Article IV.

     SECTION 6.4. NOTICE OF DECISION. If a Party decides not to file, prosecute
or maintain an application or patent on a Section 6.2 Invention in any country,
it shall give the other Party reasonable notice to this effect. After such
notice, the other Party may file, or maintain the application or patent, in
which event the first Party shall execute such documents and perform such acts
as may be reasonably necessary for the other Party to file, prosecute or
maintain such application.

     SECTION 6.5. PATENT TERM EXTENSIONS. The Parties shall cooperate, if
necessary and appropriate, with each other in gaining patent term extension
wherever applicable to Program Patent Rights covering Products. The Parties
shall, if necessary and appropriate, use reasonable efforts to agree upon a
joint strategy relating to patent term extensions, but, in the absence of mutual
agreement with respect to any extension issue, the Party selling the Product
covered by such extension shall determine which patents shall be extended,
PROVIDED THAT if both Parties are selling such Product, Astra shall have the
final decision how and when to apply for such extension. All filings for such
extension shall be made by the Party to whom the patent is assigned, PROVIDED,
HOWEVER, that in the event that the Party to whom the patent is assigned elects
not to file for an extension, such Party shall (i) inform the other Party of its
intention not to file and (ii) grant the other Party the right to file for such
extension.

     SECTION 6.6. COSTS AND EXPENSES. Each Party shall bear its own costs and
expenses in filing, prosecuting, maintaining and extending Patent Rights arising
out of the Research Program and the Astra Development Program, except that Astra
shall reimburse Millennium [**] of the costs of filing, prosecuting, maintaining
and extending Millennium Field Patent Rights incurred on and after the Effective
Date. Astra shall, however, have the right to decline to so reimburse Millennium
with respect to a Millennium Field Patent Right in any country or countries in
the Territory by so notifying Millennium in writing, in which event the licenses
granted to Astra in Article V with respect to such Millennium Field Patent Right
in such country or countries shall terminate, unless otherwise agreed in
writing.

     SECTION 6.7. THIRD PARTY INFRINGEMENT.

          (a) Millennium and Astra each agrees to take reasonable actions to
     protect the Program Patent Rights from infringement in the Field and to
     protect the Program Know-How from unauthorized use in the Field, when, 


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<PAGE>   41


     from its own knowledge or upon notice by the other Party, the Party with
     knowledge or receiving notice becomes aware of the reasonable probability
     that such infringement or unauthorized use exists in the Field.

          (b) Within sixty (60) days of becoming aware of the reasonable
     probability of an interference or infringement of the Program Patent Rights
     in the Field or unauthorized use of the Program Know-How in the Field, the
     Responsible Party (as defined below) shall decide whether to institute an
     infringement suit or take other appropriate action that it believes is
     reasonably required to protect the Program Patent Rights and Program
     Know-How in the Field. If the Responsible Party fails to institute such
     suit or take such action within such 60-day period, then the other Party
     shall have the right at its sole discretion to institute such suit or other
     appropriate action in the name of either or both Parties. In such event,
     the Responsible Party shall cooperate with the other Party to the extent
     reasonably possible.

          (c) Neither Party shall settle or compromise any claim or proceeding
     relating to Program Patent Rights or Program Know-How in the Field without
     the consent of the other Party, which consent shall not be unreasonably
     withheld, PROVIDED THAT no such consent of Millennium shall be required
     with respect to Patent Rights owned by, licensed to or otherwise controlled
     by Astra (other than Millennium Field Patent Rights and Millennium Core
     Technology Patent Rights).

          (d) As used herein, the term "Responsible Party" means (i) Astra with
     respect to Patent Rights owned by, licensed to or otherwise controlled by
     Astra (other than Millennium Field Patent Rights and Millennium Core
     Technology Patent Rights) and Patent Rights owned jointly by Astra and
     Millennium, and (ii) Astra with respect to Millennium Field Patent Rights,
     subject to agreements between Millennium and any third party which has
     licensed such Patent Rights to Millennium.

          (e) Each Party shall assume and pay all of its own out-of-pocket costs
     incurred in connection with any litigation or proceedings described in this
     Section 6.7, including, without limitation, the fees and expenses of that
     Party's counsel.

          (f) Any recovery obtained by any Party as a result of any proceeding
     described in this Section 6.7 or from any counterclaim or similar claim
     asserted in a proceeding described in Section 6.10, by settlement or
     otherwise, shall be applied in the following order of priority:


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                    Confidential Materials omitted and filed
                   separately with the Securities and Exchange
                     Commission. Asterisks denote omissions.

               (i) first, to reimburse each Party for all litigation costs in
          connection with such proceeding paid by that Party and not otherwise
          recovered; and

               (ii) second, the remainder of the recovery shall be paid [**] to
          Astra and [**] to Millennium.

     SECTION 6.8. MILLENNIUM CORE TECHNOLOGY. Millennium shall have the right to
make all determinations, control any proceedings and settle or compromise any
claims relating to infringement or unauthorized use of Millennium Core
Technology Patent Rights or Millennium Core Technology Know-How.

     SECTION 6.9. NOTICE OF CERTIFICATION. Millennium and Astra each shall
immediately give notice to the other of any certification filed under the U.S.
"Drug Price Competition and Patent Term Restoration Act of 1984," or comparable
law in other countries where applicable Program Patent Rights are maintained,
claiming that a Program Patent Right is invalid or that any infringement will
not arise from the manufacture, use or sale of any Product in the Field by a
third party. If the Responsible Party decides not to bring infringement
proceedings against the entity making such a certification, the Responsible
Party shall give notice to the other Party of its decision not to bring suit
within twenty-one (21) days after receipt of notice of such certification. The
other Party may then, but is not required to, bring suit against the Party that
filed the certification. Any suit by Astra or Millennium shall either be in the
name of Astra or in the name of Millennium, or jointly by Astra and Millennium,
as may be required by law. For this purpose, the Party not bringing suit shall
execute such legal papers necessary for the prosecution of such suit as may be
reasonably requested by the Party bringing suit.

     SECTION 6.10. CLAIMED INFRINGEMENT; CLAIMED INVALIDITY.

          (a) If the activities of either Party in connection with the Research
     Program, the Astra Development Program or as the result of making,
     importing, using, offering to sell or selling a Product in the Field result
     in a claim of patent infringement or other violation of the intellectual
     property rights of any third party, the Party who is accused of such
     infringement shall defend itself at its sole cost. The other Party shall
     cooperate with the accused Party in such defense and prosecution and shall
     have the right to be represented by counsel of its own choice.


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                         Confidential Materials omitted and filed
                       separately with the Securities and Exchange
                        Commission. Asterisks denote omissions.


          (b) If a third party at any time asserts a claim that any Program
     Patent Right is invalid or otherwise unenforceable (an "Invalidity Claim"),
     whether as a defense in an infringement action brought by Astra or
     Millennium pursuant to Section 6.7 or Section 6.9, or in an action brought
     against Astra or Millennium, the Parties shall cooperate with each other in
     preparing and formulating a response to such Invalidity Claim. The Party
     responsible for responding to such claim, at its sole expense, shall be
     initially the Responsible Party, subject to the other Party's right, at its
     sole expense, to assume responsibility if the Responsible Party elects not
     to do so. Neither Party shall settle or compromise any Invalidity Claim
     without the consent of the other Party, which consent shall not be
     unreasonably withheld, PROVIDED THAT no such consent of Millennium shall be
     required with respect to an Invalidity Claim relating to Patent Rights
     owned by, licensed to or otherwise controlled by Astra (other than
     Millennium Field Patent Rights and Millennium Core Technology Patent
     Rights)

                                   ARTICLE VII

                               ASTRA DUE DILIGENCE

     SECTION 7.1. CANDIDATE GENES. After the term of the Research Program and
during the term of the Astra Development Program, Astra shall use [**] to move
each Candidate Gene into Validated Target or Validated Protein status. Such
efforts [**] in connection with [**] that are at a [**] and that are of [**] and
[**]. Within thirty (30) days after the end of each calendar half-year during
the term of the Astra Development Program, Astra shall provide Millennium with a
written report describing Astra's progress in moving each Candidate Gene into
Validated Target or Validated Protein status. If Astra fails to satisfy its
diligence obligations as set forth in this Section 7.1, as agreed between the
Parties or determined pursuant to the dispute resolution process as set forth in
Section 12.2, with respect to any Candidate Gene, then Astra's exclusive rights
with respect to therapeutic products that are identified through use of such
Candidate Gene and its Validated Target or Validated Protein, as the case may
be, [**] (with Millennium, either alone or in collaboration with others), as
[**].

     SECTION 7.2. VALIDATED PROTEINS. During the term of the Research Program
and the Astra Development Program, Astra shall use [**] to utilize each
Validated Protein to discover and develop Products. Such efforts [**] in
connection with [**]


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                    Confidential Materials omitted and filed
                   separately with the Securities and Exchange
                     Commission. Asterisks denote omissions.

that are at a [**] and that are of [**] and [**]. Within thirty (30) days after
the end of each calendar half-year during the term of the Research Program and
the term of the Astra Development Program, Astra shall provide Millennium with a
written report describing Astra's progress in using Validated Proteins to
discover and develop Products. If Astra fails to satisfy its diligence
obligations as set forth in this Section 7.2, as agreed between the Parties or
determined pursuant to the dispute resolution process as set forth in Section
12.2, with respect to any Validated Protein, then Astra's exclusive rights (if
any) with respect to therapeutic products that are identified through the use of
such Validated Protein and the Candidate Gene from which it was derived,
[**](with Millennium, either alone or in collaboration with others), as [**].

     SECTION 7.3. VALIDATED TARGETS. During the term of the Research Program and
the Astra Development Program, Astra shall use [**] to utilize each Validated
Target to discover and develop Hits, Leads, Candidate Drugs and Products. Such
efforts [**] in connection with [**] that are at [**] and that are of [**] and
[**]. Within thirty (30) days after the end of each calendar half-year during
the term of the Research Program and the term of the Astra Development Program,
Astra shall provide Millennium with a written report describing Astra's progress
in using Validated Targets to discover and develop Hits, Leads, Candidate Drugs
and Products. If Astra fails to satisfy its diligence obligations as set forth
in this Section 7.3, as agreed between the Parties or determined pursuant to the
dispute resolution process as set forth in Section 12.2, with respect to any
Validated Target, then Astra's exclusive rights with respect to therapeutic
products that are identified through the use of such Validated Target, and the
Candidate Gene from which it was derived, [**] (with Millennium, either alone or
in collaboration with others) as [**].

     SECTION 7.4. ASTRA MINIMUM EFFORTS. Notwithstanding any other provisions in
this Agreement after the Research Program and during the Astra Development
Program, [**] to use [**] (a) [**] into [**] or [**], (b) to [**], or (c) to
[**], if Astra is using [**] and the [**].

     SECTION 7.5. COMMERCIALIZATION. Astra agrees to use [**] to conduct
required clinical development activities and seek regulatory approval in all
Major Market Countries for each Product. Such efforts shall [**] in connection
with [**] that are at a [**] in the [**] and are of [**]. Upon receipt of
regulatory approval, Astra agrees to use [**] to market and sell each such
Product in all Major Market Countries, provided, however, that [**] in a Major
Market Country where (i) [**] to the [**] of the [**], and (ii) [**] with
reasonable written documentation [**]. Within thirty (30) days after the end of
each calendar half-year, Astra shall provide 


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                    Confidential Materials omitted and filed
                   separately with the Securities and Exchange
                     Commission. Asterisks denote omissions.

Millennium with a written report describing Astra's efforts with respect to the
development and/or commercialization of each Product in each Major Market
Country. [**], as agreed between the Parties or determined pursuant to the
dispute resolution process as set forth in Section 12.2, with respect to any
Product in any Major Market Country (an "Abandoned Market"), Millennium shall
notify Astra. [**] such [**], then [**] with respect to commercialization of
therapeutic products in such Abandoned Market shall be [**] (with Millennium,
either alone or in collaboration with others), as Millennium's [**], and
Millennium shall have the right, either alone or in collaboration with others,
to develop and commercialize therapeutic products for use in the Field in the
Abandoned Market that are identified through the use of the Candidate Gene from
which such Product was derived, and the related Validated Target or Validated
Protein, as the case may be. [**] with respect to such Product in other Major
Market Countries, or to other Products in the Abandoned Market, [**].

     Notwithstanding the foregoing, [**] to develop or commercialize a Product
in a Major Market Country if (a) Astra provides to Millennium [**] from the
perspective of Millennium, and Millennium, following consideration of [**] as
set forth in this Section 7.5 with respect to such Product in such Major Market
Country or (b) [**] Product in such Major Market Country and the sale of such
other Product will [**].

     SECTION 7.6. NICHE PRODUCTS. From time to time after the conclusion of the
Research Program, but no more than once per Contract Year, Millennium shall have
the right to submit to Astra a written proposal relating to the development of a
product for a specific indication (a "Specified Indication") in the Field
(excluding the following indications: [**] and any other indication in the Field
with respect to which Astra is actively pursuing [**]) (a "Niche Product
Development Proposal"). Notwithstanding the foregoing, Millennium may not make a
Niche Product Development Proposal which involves the use of a Candidate Gene,
Validated Target or Validated Protein currently under active development by
Astra in the Astra Research Program or the Astra Development Program. Each Niche
Product Development Proposal shall include a preliminary development plan to
identify and/or develop such a product as well as a description of known
linkages between the Specified Indication and any Candidate Gene, Validated
Target or Validated Protein. Astra shall provide Millennium with notification,
within ninety (90) days after receipt of a Niche Product Development Proposal,
indicating whether or not it has a good faith interest in evaluating further the
Niche Product Development Proposal (an "Astra Preliminary Notice"). If Astra
indicates in the Astra Preliminary Notice that it wishes to evaluate further the
Niche Product Development Proposal, Astra shall undertake such evaluation in a
reasonably expeditious manner. Astra shall provide Millennium with notification
as soon as possible, but in no event later


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                    Confidential Materials omitted and filed
                   separately with the Securities and Exchange
                     Commission. Asterisks denote omissions.

than nine (9) months after the date of the Astra Preliminary Notice, whether it
intends to develop a product for the Specified Indication set forth in the Niche
Product Development Proposal (the "Astra Final Notice"). If either (i) the Astra
Preliminary Notice indicates that Astra does not wish to evaluate the
opportunity to develop a product for such Specified Indication or (ii) the Astra
Final Notice indicates that Astra does not wish to develop a product for such
Specified Indication, or (iii) if Astra does not provide the Astra Preliminary
Notice or Astra Final Notice in the requisite time periods, Millennium shall
have the co-exclusive right (with Astra) to develop (either alone or in
collaboration with others) a product for the Specified Indication and shall have
all requisite rights and licenses under Millennium Field Patent Rights or
Millennium Field Know-How, including rights to sublicense, necessary for the
development, use and sale of such a product solely for such Specified
Indication. In such event, Millennium and/or any third party collaborators shall
use [**] to develop such product for the Specified Indication, conduct required
clinical development activities, seek regulatory approvals and commercialize
such product, PROVIDED THAT Millennium may, at any time, by written notice to
Astra, cease such efforts and waive its rights to develop and commercialize such
product for the Specified Indication. In the event that Astra indicates in the
Astra Final Notice that Astra wishes to develop a product for the Specified
Indication, then (i) such product shall be considered a Product for purposes of
this Agreement, and (ii) Astra's development and commercialization obligations
set forth in Sections 7.2, 7.3, 7.4 and 7.5 shall apply to such Product
regardless of whether another Product is then being developed or commercialized
by Astra.

                                  ARTICLE VIII

                                    PAYMENTS

     SECTION 8.1. INITIAL LICENSE FEES. Astra has made the following
non-refundable payments to Millennium in consideration of the rights granted to
Astra under this Agreement:

          (a) [**] on or before December 20, 1995;

          (b) [**] on or before December 31, 1997.

     SECTION 8.2. ADDITIONAL FEES. Astra shall make the following payments to
Millennium upon the renewal or termination of the Millennium Research Program,
pursuant to Section 2.7


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                    Confidential Materials omitted and filed
                   separately with the Securities and Exchange
                     Commission. Asterisks denote omissions.

          (a) [**] within two (2) months after the conclusion of the third
     Contract Year as consideration for Millennium providing in the fourth
     Contract Year an average minimum of twenty (20) FTE's as reviewed and
     verified by the Joint Management Team on a quarterly basis;

          (b) [**] within two (2) months after the conclusion of the fourth
     Contract Year as consideration for Millennium providing in the fifth
     Contract Year an average minimum of twenty (20) FTE's as reviewed and
     verified by the Joint Management Team on a quarterly basis;

          (c) [**] within two (2) months after the conclusion of the fifth
     Contract Year if, pursuant to Section 2.7(c), the Millennium Research
     Program is terminated at Astra's election at the end of the fifth Contract
     Year;

     [**] of the [**] to this [**] except that such [**] for any [**] to [**] of
     the [**] otherwise payable to [**].

     SECTION 8.3. RESEARCH FUNDING.

          (a) FTE SUPPORT. In support of research and development to be
     conducted by Millennium pursuant to this Agreement, Astra will make the
     following payments to Millennium:

               (i) To fund the Millennium Research Program, Astra shall pay to
          Millennium an amount equal to the following amounts per FTE: The
          full-time equivalent rate shall be [**] per FTE (all inclusive) from
          the Effective Date to December 31, 1996 (the "FTE Rate"). On each
          January 1 thereafter, the FTE Rate shall be adjusted by an amount
          equal to the percentage increase or decrease, if any, in the United
          States Consumer Price Index (or any comparable successor index
          thereto) from the immediately preceding January 1.

               (ii) During the first three (3) Contract Years, Millennium shall
          provide, and Astra shall fund, a minimum (but not more than the number
          of FTEs actually provided by Millennium) of [**] FTEs for the first
          Contract Year; [**] FTEs for the second Contract Year; and [**] FTEs
          for the third Contract Year; it being understood that the number of
          FTEs actually working on the Millennium Research Program in the first
          Contract Year will gradually increase as FTEs are hired.


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                    Confidential Materials omitted and filed
                   separately with the Securities and Exchange
                     Commission. Asterisks denote omissions.

               (iii) In accordance with Astra's election, pursuant to Section
          2.7(b) and 2.7(c), to extend the term of the Millennium Research
          Program until the end of the seventh Contract Year, Millennium shall
          provide, and Astra shall fund, during the fourth through seventh
          Contract Years, a minimum (but Astra shall not fund more than the
          number of FTEs actually provided by Millennium) of [**] FTEs for the
          fourth Contract Year, [**] FTEs for the fifth Contract Year, [**] FTEs
          for the sixth Contract Year, and [**] for the seventh Contract Year.

               (iv) The numbers set forth above for FTE employees to be provided
          by Millennium, and funded by Astra, for research and development from
          the Effective Date through the end of the Millennium Research Program
          may be adjusted from time to time by decision of the Joint Management
          Team, PROVIDED, HOWEVER, that the number of FTEs funded by Astra shall
          not be below the minimums set forth above, except by mutual agreement
          of the Parties.

               (v) Within ten (10) days of the first day of each contract
          quarter, Astra shall pay to Millennium the total amount due for the
          upcoming quarter. Within thirty (30) days of the completion of each
          contract quarter, Millennium shall provide Astra with a written
          statement setting forth the actual numbers of FTEs provided, and shall
          provide Astra with a credit for any amounts overpaid by Astra or bill
          Astra for any amounts underpaid during such contract quarter (except
          that with respect to the last quarterly payment of the last Contract
          Year, Millennium shall reimburse Astra for any amounts overpaid by
          Astra).

               (vi) If third party collaborative research expenses incurred by
          Millennium in support of the Millennium Research Program in any
          Contract Year exceeds an amount equal to [**], then Astra shall
          reimburse Millennium for such excess collaborative research expenses
          subject to the approval of the Joint Management Team.

     (b) RECORDS AND AUDITS. Millennium shall keep complete and accurate records
of the latest three (3) years of FTEs. Astra shall have the right annually at
Astra's expense to have an independent, certified public accountant, reasonably
acceptable to Millennium, review such records in the location(s) where such
records are maintained by Millennium upon reasonable notice and during regular
business hours for the purposes of verifying FTEs on 


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                    Confidential Materials omitted and filed
                   separately with the Securities and Exchange
                     Commission. Asterisks denote omissions.

          an annual basis for which Astra has provided funding pursuant to the
     Millennium Research Program. Results of such review shall be made available
     to both Parties. If the review reflects an overpayment of funding to
     Millennium, such overpayment shall be promptly remitted to Astra. If the
     overpayment is equal to or greater than five percent (5%) of the actual
     annual funding amount that was otherwise due, Astra shall be entitled to
     have Millennium pay all of the costs of such review.

     SECTION 8.4. MILESTONES. Within thirty (30) days upon the achievement of
the following milestones, Astra shall pay to Millennium the specified milestone
payments, all of which shall be non-refundable:

          (a) The sum of [**] for [**] (i) that is [**], or (ii) that is [**] or
     [**] in the Field for the [**], in each case in the course of the
     Millennium Research Program; provided that no more than [**] may qualify
     for this milestone payment until [**]. Upon the identification of each and
     every [**] or [**], the number of [**] eligible for this milestone payment
     shall increase by [**]. In the event that, (i) following the receipt by
     Millennium of a milestone payment with respect to a [**] pursuant to this
     Section 8.4(a), it is demonstrated that [**] in a disease or condition in
     the Field, and (ii) as a result of the circumstance described in clause (i)
     above, [**], if any, with respect to such [**], then [**] of such milestone
     payment shall be [**] as soon as possible [**] under this Agreement.

          (b) The sum of [**] for each [**] that is successfully identified. In
     the event that, (i) following the receipt by Millennium of a milestone
     payment with respect to a [**] pursuant to this Section 8.4(b), it is
     demonstrated that a [**] that constitutes [**] of such [**] in a [**] or
     [**], and (ii) as a result of the circumstance described in clause (i)
     above, [**], if any, with respect to such [**] or such [**], then [**] of
     such milestone payment shall be [**] as soon as possible [**] under this
     Agreement.

          (c) The sum of [**] or each [**] that is successfully identified. In
     the event that, (i) following the receipt by Millennium of a milestone
     payment with respect to a [**] pursuant to this Section 8.4(c), it is
     demonstrated that [**] that constitutes [**] in a [**] or [**], and (ii) as
     a result of the circumstance described in clause (i) above, [**], if any,
     with respect to such [**], then [**] of such milestone payment shall be
     [**] as soon as possible [**] under this Agreement.


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<PAGE>   50


                    Confidential Materials omitted and filed
                   separately with the Securities and Exchange
                     Commission. Asterisks denote omissions.

          (d) The sum of [**] for each [**] based on a [**].

          (e) The sum of [**] of either (i) [**] or (ii) [**], including [**]
     but excluding [**]; PROVIDED, that each [**] and each [**] shall be counted
     only once and shall be counted in the order in which it is identified. For
     the purposes of clarity, should the order of identification be [**], then
     [**], then [**], such sequence of identification shall be considered the
     identification of [**].

          (f) The sum of [**] for each [**] that is successfully identified from
     a [**] arising from a [**].

          (g) The sum of [**] for each [**] that is successfully identified from
     a [**] arising from a [**] whether or not it is a [**], but excluding a
     [**].

          (h) Upon the [**] or its equivalent in the first Major Market Country,
     the sum of [**] for each Product.

          (i) Upon the [**] or its equivalent in the first Major Market Country,
     the sum of [**] for each Product.

          (j) Upon the [**] or its equivalent in the first Major Market Country,
     the sum of [**] for each Product.

          (k) Upon filing of a [**] or its equivalent in the first Major Market

          (l) Upon approval of a [**] or its equivalent in the first Major
     Market Country, the sum of [**] for each Product.

Notwithstanding the foregoing to the contrary, (i) [**] payment shall be made
pursuant to [**] for [**] with respect to which [**] has [**] pursuant to such
Subsection, and (ii) the [**] to be made pursuant to [**] shall be [**] of the
amount specified in such Subsection with respect to a Product that (A) comprises
a [**] or a [**] or a [**] that corresponds to a [**] or [**] or a [**], as the
case may be, that [**] with respect to which [**] pursuant to such Subsection,
or (B) comprises a [**] based upon, or a [**], a [**] that is [**] with respect
to which [**] pursuant to such Subsection.

     If Astra begins the development of a Product and later ceases development
of said Product due to [**] or the Product is [**], then any milestone payments
made 


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<PAGE>   51


                    Confidential Materials omitted and filed
                   separately with the Securities and Exchange
                     Commission. Asterisks denote omissions.

under [**] shall be [**] which [**] that (1) [**] of the [**] as contained in
the [**], (2) [**] or a [**] that corresponds to the [**] or the [**] or a [**],
as the case may be, contained in the [**], or (3) [**] based upon, or a [**],
the [**] contained in the original Product.

     SECTION 8.5. ROYALTY PAYMENTS TO MILLENNIUM ON PRODUCTS.

          (a) Astra shall pay to Millennium royalties on Products that comprise
     a Program Small Molecule Drug or a Related Small Molecule Drug or a Program
     Peptido Mimetic Drug or a Related Peptido Mimetic Drug or a Program
     Antisense Drug or a Related Antisense Drug or a Program Protein Drug or a
     Program Analog Protein Drug or a Program Protein Mimic Drug. The royalties
     on each Product shall be payable initially at the rate of [**] of Net
     Sales, PROVIDED THAT, at such time as Net Sales for a Product in any
     calendar year exceed [**] then the royalty rate on all Net Sales of such
     Product in such calendar year (retroactive to the beginning of such year)
     and for all future calendar years shall be [**] of Net Sales of such
     Product, and PROVIDED FURTHER, that at such time as Net Sales for a Product
     in any calendar year exceed [**] then the royalty rate on all Net Sales of
     such Product in such calendar year (retroactive to the beginning of such
     year) and for all future calendar years shall be [**] of Net Sales of such
     Product.

          (b) Astra shall pay to Millennium royalties of [**] of Net Sales on
     Products that comprise a Modified Drug. Notwithstanding the provisions of
     paragraphs (a) and (b) above, the royalty rates set forth in this Section
     8.5 shall be reduced, on a country-by-country basis, by [**] on Net Sales
     of any Product [**]. For the purposes of this Article VIII, a Product is
     afforded "[**]," in the circumstance where, on a country-by-country basis,
     (i) the [**] contained within such Product is [**], or (ii) such Product
     [**].

     SECTION 8.6. LENGTH OF ROYALTY PAYMENTS. The royalties payable under
Sections 8.5 shall be paid on a country-by-country basis from the date of First
Commercial Sale for each Product until the termination of any Legal Exclusivity
afforded such Product in such country, or until [**] years after such First
Commercial Sale, whichever is longer. Notwithstanding the foregoing, all
obligations of Astra to pay royalties to Millennium on the Net Sales of Products
pursuant to Section 8.5 shall [**].


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<PAGE>   52


                    Confidential Materials omitted and filed
                   separately with the Securities and Exchange
                     Commission. Asterisks denote omissions.

     SECTION 8.7. ROYALTIES PAYABLE ONLY ONCE. The obligation to pay royalties
is imposed only once with respect to the same unit of Product. Except as
specifically provided in this Agreement, it is understood and agreed that there
shall be no deductions from the royalties payable hereunder.

     SECTION 8.8. OTHER PRODUCTS. Astra shall have no obligations to Millennium
to make any milestone payments or royalty payment for any Other Products.

     SECTION 8.9. PAYMENT OBLIGATIONS TO THIRD PARTIES. Each Party shall be
solely responsible for fulfilling any of its past or future payment obligations
arising from such Party's agreements or other arrangements with third parties.

     SECTION 8.10. BANKRUPTCY. In the event that

          (a) a Millennium Event of Bankruptcy (as defined below) occurs during
     the term of the Millennium Research Program; AND

          (b) as a result of the Millennium Event of Bankruptcy, the trustee in
     bankruptcy rejects or disavows this Agreement, or Millennium fails to
     comply with its continuing obligations with respect to the conduct of the
     Research Program,

then the Research Program shall be deemed to be terminated, and Astra shall not
be obligated to make any additional license fee payment or research funding
payments from and after the date of such termination. Furthermore, Astra shall
not be obligated to make any milestone or royalty payments relating to (i)
Modified Drugs that were not in development under the Research Program at the
time of such termination, or (ii) other Products that are not based upon or
derived from Candidate Genes, Validated Proteins or Validated Targets
identified, discovered or the development of which was undertaken in the course
of the Research Program. The foregoing shall not affect, and Astra shall remain
obligated to make all applicable [**] relating to, [**] identified, discovered
or the development of which was undertaken in the course of the Research
Program, and all Products based upon or derived therefrom. As used above, the
term "Millennium Event of Bankruptcy" means (a) the appointment of a custodian
or receiver for Millennium or any material part of the property of Millennium if
such appointment is not terminated or dismissed within ninety (90) days, (b) the
institution by Millennium of any proceeding under the United States Bankruptcy
Code or any other federal or state bankruptcy, reorganization, receivership, or
other similar law affecting the rights of creditors generally or the making by
Millennium of a composition or any assignment or trust 


                                       46


<PAGE>   53


mortgage for the benefit of creditors, or (c) the institution against Millennium
of a proceeding under the United States Bankruptcy Code or any other federal or
state bankruptcy, reorganization, receivership, or other similar law affecting
the rights of creditors generally, which proceeding is not dismissed within
ninety (90) days of filing.

                                   ARTICLE IX

                                   ACCOUNTING

     SECTION 9.1. ROYALTY REPORTS. Astra shall deliver to Millennium, within
sixty (60) days after the end of each calendar quarter, a written accounting of
Astra's and its Sublicensees' sales and other consideration received subject to
royalty payment due to Millennium for such quarter. Such quarterly reports shall
indicate the Net Sales of Products on a country-by-country basis. This
obligation shall commence with the first calendar quarter in which there is a
Net Sale of a Product by Astra or any of its Sublicensees.

     SECTION 9.2. DELIVERY OF ROYALTY. When Astra delivers the accounting to
Millennium, Astra shall also deliver all royalty payments due to Millennium for
the calendar quarter.

     SECTION 9.3. RECORDS AND AUDITS. Astra shall keep, and shall require its
Sublicensees to keep, complete and accurate records of the latest three (3)
years of Net Sales. Millennium shall have the right annually at Millennium's
expense to have an independent, certified public accountant, reasonably
acceptable to Astra, review such records in the location(s) where such records
are maintained by Astra or its Sublicensees upon reasonable notice and during
regular business hours for the purposes of verifying royalties payable to
Millennium and Net Sales. Results of such review shall be made available to both
Parties. If the review reflects an underpayment of royalties to Millennium, such
underpayment shall be promptly remitted to Millennium. If the underpayment is
equal to or greater than five percent (5%) of the royalty amount that was
otherwise due, Millennium shall be entitled to have Astra pay all of the costs
of such review.

     SECTION 9.4. CURRENCY OF PAYMENTS. All payments under this Agreement shall
be made in United States dollars by wire transfer to such bank account as
Millennium may designate from time to time. Any payments due hereunder on Net
Sales outside of the United States shall be payable in United States dollars at
the rate of exchange of the currency of the country in which the Net Sales are
made as published by The Wall Street Journal for the last business day of the
calendar quarter for which the royalties are payable.


                                       47


<PAGE>   54


                    Confidential Materials omitted and filed
                   separately with the Securities and Exchange
                     Commission. Asterisks denote omissions.

     SECTION 9.5. TAX WITHHOLDING. Astra and Millennium shall use all reasonable
and legal efforts to reduce tax withholding on payments made to Millennium
hereunder. Notwithstanding such efforts, if the Parties conclude that tax
withholdings under the laws of Sweden are required with respect to payments to
Millennium under Article VIII, Astra shall withhold the required amount and pay
it to the appropriate governmental authority. In such a case, Astra will
promptly provide Millennium with original receipts or other evidence sufficient
to allow Millennium to obtain the benefits of such tax withholdings. All
royalties payable to Millennium hereunder shall be paid by Astra from its
Swedish headquarters or the United States. In the event that Astra changes its
payment practices or changes the location of its operation and such changes
result in increased withholding taxes, Astra shall remit to Millennium an
amount, in addition to the royalties otherwise payable, necessary to compensate
Millennium in full for the increased withholding taxes. Astra shall not deduct
such tax withholdings from payments to Millennium to the extent that Astra is
able to utilize the tax credits resulting from such withholdings.

                                    ARTICLE X

                              TERM AND TERMINATION

     SECTION 10.1. TERM. This Agreement becomes effective as of the Effective
Date, may be terminated as set forth in this Article X hereof, and otherwise
remains in effect until the expiration of the term of Astra's obligation to pay
royalties. [**] shall be [**] in the [**] under this Agreement.

     SECTION 10.2. MATERIAL NON-PERFORMANCE. In the event that either Party (a
"Defaulting Party") shall default in any material term, covenant or provision of
this Agreement (a "Default"), the other Party (a "Non-Defaulting Party") shall,
without unreasonable delay following discovery of such Default, notify the
Defaulting Party in writing, and the Parties shall consult with each other in
good faith to endeavor to determine whether a Default has occurred and, if so,
to agree upon the most effective means to cure such Default and, if necessary,
to effect restitution in favor of the Non-Defaulting Party for the consequences
of such Default (collectively the "Resolution"). In the event that the Parties
agree upon a Resolution with respect to a Monetary Default (as defined below),
the Defaulting Party shall pay all amounts required to be paid pursuant to such
Resolution within fifteen (15) days of such agreement on the Resolution. Failure
to pay all such amounts within such fifteen 


                                       48


<PAGE>   55


(15) day period shall result, at the election of the Non-Defaulting Party, in
the termination of this Agreement.

     In the event (i) the Parties are unable to agree upon a Resolution, either
because they are unable to agree upon whether or not a Default has occurred or
because they are unable to agree upon cure or restitution provisions, or (ii) if
with respect to a Default which is not a Monetary Default, within ninety (90)
days after agreement on a Resolution the Defaulting Party, in the exercise of
reasonable diligence shall have been unable to remedy such Default, then in
either such event, the Parties agree that the determination of whether a Default
has occurred and the remedy of the Non-Defaulting Party with respect to the
Default by the Defaulting Party shall be determined by arbitration pursuant to
Section 12.2 hereof, and the arbitrators shall, except as provided below, be
authorized to fashion such remedy, including equitable relief, which may include
termination of this Agreement in whole or in part, as the arbitrators shall
determine appropriate, subject to the following provisions: (a) the termination
of this Agreement in whole shall only be the remedy of last resort, except as
provided in subsection (b); (b) with respect to a Monetary Default, the remedy
for such Monetary Default shall be full payment within fifteen (15) days after
the determination by the arbitrators of all amounts owed PLUS (i) interest on
the unpaid amounts from the due date through the actual payment date at the
prime rate of interest as reported in THE WALL STREET JOURNAL, and (ii) the full
costs of arbitration, including without limitation the fees and expenses of the
arbitrators and of counsel to the Non-Defaulting Party; (c) failure to effect
the remedy set forth in subsection (b) within the fifteen (15) day period
specified therein shall result, at the election of the Non-Defaulting Party, in
the termination of this Agreement; (d) in the event that Millennium is the
Defaulting Party with respect to a Default that is not a Monetary Default, the
arbitrators shall determine the appropriate reduction, if any, in ongoing
milestone and royalty payments to be paid to Millennium, based upon all relevant
factors including the nature of the Default, the relative contributions made to
the development of Products (as compared with the contributions expected to be
made under this Agreement in the absence of such Default), licensing rates
prevailing in the industry and such other factors deemed relevant by the
arbitrators; (e) other than as provided in subsection (d), in fashioning a
remedy, the arbitrators shall not be empowered to modify or alter the provisions
of this Agreement.

     As used herein, the term "Monetary Default" means (i) a Default relating to
any payment obligation under this Agreement, or (ii) a failure to fulfill any
payment obligation imposed upon a Party as a result of a Resolution, or (iii) a
failure to fulfill any payment obligation imposed upon a Party by arbitrators
pursuant to arbitration conducted in accordance with the provisions of this
Section 10.2 and Section 12.2.

     SECTION 10.3. RIGHTS UPON TERMINATION FOR DEFAULT. If this Agreement
terminates pursuant to Section 10.2 following a Default, (a) the Defaulting
Party shall 


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<PAGE>   56


                    Confidential Materials omitted and filed
                   separately with the Securities and Exchange
                     Commission. Asterisks denote omissions.

return to the Non-Defaulting Party all Confidential Information and materials
received from the Non-Defaulting Party during the term of the Agreement, (b) the
Defaulting Party shall cease all use of the Confidential Information and
materials received from the Non-Defaulting Party for any purpose, except that
the Defaulting Party may keep a copy of all documents for record keeping
purposes only, (c) in the event that the [**], as set forth in [**], and (d) in
the event that the [**] under this Agreement shall [**]. Further, in the event
that the [**] and at the [**] is developing any Product which comprises a
Program Antisense Drug, Related Antisense Drug, Program Protein Drug, Program
Analog Protein Drug or Program Mimic Drug, then [**] all data and information
which it has developed prior to [**] which can reasonably be viewed as necessary
or useful to obtain governmental regulatory approvals of such Product and,
subject to any agreements with third parties, Millennium and its licensees shall
be entitled to use such information freely; PROVIDED, HOWEVER, [**] hereunder
shall not extend to confidential information of [**] relating to technologies
and methods for manufacturing and/or formulating the [**].

     SECTION 10.4. RESIDUAL RIGHTS. Upon expiration or early termination of this
Agreement, except as specifically provided herein to the contrary, all rights
and obligations of the Parties shall cease, except as follows:

          (a) Obligations to pay royalties and other sums accruing hereunder up
     to the date of expiration or termination; and

          (b) The right to complete the manufacture and sale of Products, which
     qualify as "work in process" under generally accepted cost accounting
     standards or which are in stock at the date of expiration or termination,
     and the obligation to pay royalties on Net Sales of such Products; and

          (c) The obligations, if any, to make milestone payments for milestones
     as achieved and to pay royalties with respect to Products, as determined
     pursuant to Section 10.2; and

          (d) The obligations regarding confidentiality as set forth in Article
     IV; and

          (e) All obligations for record keeping and accounting reports; and

          (f) A Party's right to inspect books and records of the other Party as
     set forth in Article XIII and Article IX, which right shall continue in
     full force 


                                       50


<PAGE>   57


     and effect for three (3) years following the expiration of such other
     Party's obligation under this Agreement to keep such books and records; and

          (g) Obligations of defense and indemnity, which obligations shall
     continue in full force and effect for an unlimited period; and

          (h) Obligations set forth in Section 6.7 and Section 6.10, but only
     with respect to those causes of action that accrued prior to such
     expiration or termination; and

          (i) Any cause of action or claim of Millennium or Astra accrued or to
     accrue because of any breach or default by the other Party hereunder; and

          (j) All other terms, provisions, representations, rights and
     obligations contained in this Agreement that by their sense and context are
     intended to survive until performance thereof by either or both Parties.

                                   ARTICLE XI

                        PRODUCT LIABILITY INDEMNIFICATION

     Astra agrees to defend Millennium at Astra's cost and expense, and will
indemnify and hold Millennium and its directors, officers, employees and agents
(the "Millennium Indemnified Parties") harmless from and against any losses,
costs, damages, fees or expenses arising out of any claim relating to personal
injury from the development, manufacture, use, sale or other disposition of any
Product by Astra or its Sublicensees (except for products developed,
manufactured, used or sold by Millennium or its licensees (other than Astra)).
In the event of any such claim against the Millennium Indemnified Parties by any
Party, Millennium shall promptly notify Astra in writing of the claim and Astra
shall manage and control, at its sole expense, the defense of the claim and its
settlement. The Millennium Indemnified Parties shall cooperate with Astra and
may, at their option and expense, be represented in any such action or
proceeding. Astra shall not be liable for any litigation costs or expenses
incurred by the Millennium Indemnified Parties without Astra's prior written
authorization. In addition, Astra shall not be responsible for the
indemnification of any Millennium Indemnified Party arising from any negligent
or intentional acts by such Party.


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<PAGE>   58

                                   ARTICLE XII

                    GOOD FAITH NEGOTIATION/DISPUTE RESOLUTION

     SECTION 12.1. GENERAL. In acknowledgment of the benefit to both Parties to
resolve differences quickly and efficiently with as little disruption of each
Parties' business as possible, the Parties agree to abide by the following
provisions in connection with any dispute that should arise between the Parties
with respect to any matter relating to this Agreement, including any questions
regarding the existence, validity or termination thereof.

     SECTION 12.2. DISPUTE RESOLUTION PROCESS.

          (a) SELECTION OF ARBITRATORS. In the event that the Parties are unable
     to resolve a dispute within thirty (30) days after commencement of good
     faith negotiations between the Parties, either Party may submit the matter
     to binding arbitration in accordance with the procedures set forth in this
     Section 12.2. If a Party intends to commence arbitration to resolve a
     dispute, such Party shall provide written notice to the other Party of such
     intention, and shall designate one arbitrator. Within ten (10) days of
     receipt of such notice, the other Party shall designate in writing a second
     arbitrator. The two arbitrators so designated shall, within ten (10) days
     thereafter, designate a third arbitrator. The arbitrators so designated
     shall not be employees, consultants, officers, directors or shareholders of
     or otherwise associated with either Party. The arbitration shall be
     conducted in accordance with the then rules of commercial arbitration of
     and before the American Arbitration Association in New York, New York. The
     language of such arbitration shall be English and all notices and written
     submissions provided in such proceeding shall be in English.

          (b) WRITTEN PROPOSALS. Within fifteen (15) days after the designation
     of the third arbitrator, the arbitrators and the Parties shall meet at
     which time each Party shall be required to set forth in writing the issues
     which need to be resolved and a proposed ruling on each such issue. Written
     submissions shall be limited to thirty (30) pages of text (not including
     exhibits which may include copies of agreements, or extracts from books and
     records, but including testimony affidavits).

          (c) HEARING. The arbitrators shall set a date for a hearing, which
     shall be no later than twenty (20) days after the submission of written
     proposals, to discuss each of the issues identified by the Parties. Each
     Party shall have the right to be represented by counsel. The arbitrators
     shall have sole discretion with regard to the admissibility of any
     evidence. Unless 


                                       52


<PAGE>   59


     otherwise determined by unanimous agreement of the arbitrators the hearing
     shall be concluded in one (1) day.

          (d) RULING. The arbitrators shall use their best efforts to rule on
     each disputed issue within twenty (20) days after the completion of the
     hearings described in subsection (c) above. The arbitrators' ruling shall
     be, in the absence of fraud or manifest error, binding and conclusive upon
     both Parties and may be enforced in a court of competent jurisdiction.
     Other than as provided in Section 10.2(d), in fashioning a remedy, the
     arbitrators shall not be empowered to modify or alter the provisions of
     this Agreement. The arbitrators may not award multiple, punitive or
     exemplary damages.

     SECTION 12.3. ARBITRATION COSTS. The arbitrators shall be paid a reasonable
fee plus expenses, which fees and expenses shall be paid as designated by the
arbitrators or if the arbitrators do not so designate such costs shall be shared
equally by the Parties.

                                  ARTICLE XIII

                                  GOVERNING LAW

     This Agreement shall be construed and the respective rights of the Parties
hereto determined according to the substantive laws of the State of Delaware
notwithstanding the provisions governing conflict of laws under such Delaware
law to the contrary.

                                   ARTICLE XIV

                                   ASSIGNMENT

     Neither Party may assign this Agreement in whole or in part without the
consent of the other, except if such assignment occurs in connection with the
sale or transfer of all or substantially all of the business and assets of
Millennium or Astra.

                                   ARTICLE XV

                                   AMENDMENTS

     This Agreement constitutes the entire agreement between the Parties and
supersedes all previous arrangements whether written or oral. Any amendment or
modification to this Agreement shall be made in writing signed by both Parties.


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<PAGE>   60

                                   ARTICLE XVI

                                     NOTICES

     All notices, instructions and other communications hereunder or in
connection herewith shall be in writing and shall be (i) delivered personally,
(ii) sent by registered or certified mail, return receipt requested, postage
prepaid, (iii) sent via a reputable international courtier service, or (ii) sent
by facsimile transmission, in each case to an address set forth below. Any such
notice, instruction or communication shall be deemed to have been delivered upon
receipt if delivered by hand, five business days after it is sent by registered
or certified mail, return receipt requested, postage prepaid, three business
days after it is sent via a reputable international courier service, or when
transmitted with electronic confirmation of receipt, if transmitted by facsimile
(if such transmission is on a business day; otherwise, on the next business day
following such transmission).

     Notices to Millennium shall be addressed to:

                           Millennium Pharmaceuticals, Inc.
                           640 Memorial Drive
                           Cambridge, Massachusetts 02139-4815
                           Attention:  Chief Business Officer
                           Facsimile No.:  (617) 621-0264

          with a copy to:

                           Attention:  Legal Department

     Notices to Astra shall be addressed to:

                           Astra AB
                           S-151 85 Sodertalje, Sweden
                           Attention:  President
                           Facsimile No.:  011-468-553-29000

          with a copy to:

                           Attention:  General Counsel
                           Facsimile No.:  011-468-553-28812

Either Party may change its address by giving notice to the other Party in the
manner herein provided.


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<PAGE>   61


                    Confidential Materials omitted and filed
                   separately with the Securities and Exchange
                     Commission. Asterisks denote omissions.

                                  ARTICLE XVII

                                  FORCE MAJEURE

     No failure or omission by the Parties hereto in the performance of any
obligation of this Agreement shall be deemed a breach of this Agreement or
create any liability if the same shall arise from any cause or causes beyond the
control of the Parties, including, but not limited to, the following: acts of
God; acts or omissions of any government; any rules, regulations or orders
issued by any governmental authority or by any officer, department, agency or
instrumentality thereof; fire; storm; flood; earthquake; accident; war;
rebellion; insurrection; riot; and invasion and provided that such failure or
omission resulting from one of the above causes is cured as soon as is
practicable after the occurrence of one or more of the above-mentioned causes.

                                  ARTICLE XVIII

                         REPRESENTATIONS AND WARRANTIES

     SECTION 18.1. REPRESENTATION OF AUTHORITY. Millennium and Astra each
represents and warrants to the other that as of the effective date of this
Agreement it has full right, power and authority to enter into this Agreement
and to provide the Know-How under Article III hereof, including the biological
materials, subject to the limitations set forth in this Section 18.1. Millennium
represents and warrants to Astra that it (i) is the owner or licensee, as the
case may be, of the Millennium Field Patent Rights, Millennium Field Know-How,
Millennium Core Technology Know-How, and Millennium Core Technology, and (ii)
has the right to grant to Astra the licenses and sublicenses granted pursuant to
this Agreement. Millennium has furnished Astra with (a) a copy of all patent
applications comprising Millennium Field Patent Rights and (b) a summary of all
license agreements and options pertaining to the Millennium Field Patent Rights
and Millennium Field Know-How existing as of the Effective Date, and by its
execution and delivery of this Agreement, Astra agrees to be bound by the terms
of such agreements to the extent required thereby. Millennium further represents
that it will not, without the prior written consent of Astra, [**].

     SECTION 18.2. OUTSTANDING AGREEMENTS. APPENDIX B, which shall be amended by
Millennium from time to time consistent with the provisions of this Agreement,


                                       55


<PAGE>   62


lists all material outstanding options, licenses or agreements of any kind
between Millennium and any third party relating to Millennium Field Patent
Rights and Millennium Field Know-How and Millennium Core Technology Know-How,
Millennium Core Technology Patent Rights as of the Effective Date.

     SECTION 18.3. KNOWLEDGE OF PENDING OR THREATENED LITIGATION. Each Party
represents and warrants to the other that it is not aware of any pending or
threatened litigation (and has not received any communication) which alleges
that such Party's activities in the Field to date have violated, or by
conducting its business as currently proposed under the Research Program
contemplated herein would violate, any of the intellectual property rights of
any other person. To the best of each Party's knowledge, there is no material
unauthorized use, infringement or misappropriation of any of its intellectual
property rights licensed hereunder to the other Party.

     SECTION 18.4. EMPLOYEE OBLIGATIONS. Each Party represents and warrants that
all of its employees, officers, and consultants have executed agreements or have
existing obligations under law requiring, in the case of employees and officers,
assignment to such Party of all inventions made during the course of and as the
result of their association with such Party and obligating the individual to
maintain as confidential such Party's Confidential Information as well as
confidential information of a third party which such Party may receive, to the
extent required to support such Party's obligations under this Agreement.

     SECTION 18.5. FULL DISCLOSURE. Each Party has disclosed to the other in
good faith all material information such Party believes is relevant to the
subject matter of this Agreement, and to such Party's ability to observe and
perform its obligations hereunder.

                                   ARTICLE XIX

                              PUBLIC ANNOUNCEMENTS

     Any announcements or similar publicity with respect to the execution of
this Agreement shall be agreed between the Parties in advance of such
announcement. Astra understands that this Agreement and Millennium's efforts
hereunder are likely to be of significant interest to investors, analysts and
others, and Millennium therefore intends to make such public announcements with
respect thereto. Millennium agrees that any such announcement will not contain
confidential business or technical information and, if disclosure of
confidential business or technical information is required by law or regulation,
will make reasonable efforts to minimize such disclosure and obtain confidential
treatment for any such information which is disclosed to a governmental agency
or group. Each Party agrees to provide to the other Party a copy of any public
announcement as soon as reasonably 


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<PAGE>   63


practicable under the circumstances prior to its scheduled release. Each Party
shall have the right to expeditiously review and recommend changes to any
announcement regarding this Agreement or any studies carried out under this
Agreement. Except as otherwise required by law, the Party whose press release
has been reviewed shall remove any information the reviewing Party reasonably
deems to be inappropriate for disclosure.

                                   ARTICLE XX

                              ADDITIONAL AGREEMENTS

     SECTION 20.1. INDEPENDENT CONTRACTORS. It is understood and agreed that the
relationship between the Parties hereunder is that of independent contractors
and that nothing in this Agreement shall be construed as authorization for
either Astra or Millennium to act as agent for the other. Members of the Joint
Management Team shall be, and shall remain, employees of Millennium or Astra, as
the case may be. Neither party shall incur any liability for any act or failure
to act by members of the Joint Management Team who are employees of the other
party.

     SECTION 20.2. CONSENTS NOT UNREASONABLY WITHHELD. Whenever provision is
made in this Agreement for either Party to secure the consent or approval of the
other, that consent or approval shall not unreasonably be withheld, and whenever
in this Agreement provisions are made for one Party to object to or disapprove a
matter, such objection or disapproval shall not unreasonably be exercised.

     SECTION 20.3. NO STRICT CONSTRUCTION. This Agreement has been prepared
jointly and shall not be strictly construed against either Party.

     SECTION 20.4. HEADINGS. The captions or headings of the Sections or other
subdivisions hereof are inserted only as a matter of convenience or for
reference and shall have no effect on the meaning of the provisions hereof.

     SECTION 20.5. SEVERANCE OF CLAUSES. Each Party agrees that, should any
provision of this Agreement be determined by a court of competent jurisdiction
to violate or contravene any applicable law or policy, such provision will be
severed or modified by the court to the extent necessary to comply with the
applicable law or policy, and such modified provision and the remainder of the
provisions hereof will continue in full force and effect.

     SECTION 20.6. NO WAIVER. The waiver of a breach hereunder may be effected
only by a writing signed by the waiving Party and shall not constitute a waiver
of any other breach.


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<PAGE>   64


     SECTION 20.7. CHANGE IN CONTROL.

          (a) In the event of the occurrence of a Change of Control (as defined
     below) of Astra, Millennium shall have the right, at its election, to
     provide written notice to Astra (or to the acquiring party) requiring that
     Astra and the acquiring party indicate to Millennium in writing, within
     thirty (30) days after receipt of Millennium's notice, that Astra and the
     acquiring party confirm this Agreement and agree to the continued
     performance of all obligations of Astra under this Agreement. If Astra and
     the acquiring party fail to so confirm and agree in writing within such
     thirty (30) day period, Millennium shall have the right to terminate this
     Agreement immediately upon providing written notice thereof to Astra.

          (b) In the event of the occurrence of a Change of Control (as defined
     below) of Millennium, Astra shall have the right, at its election, to
     provide written notice to Millennium (or to the acquiring party) requiring
     that Millennium and the acquiring party indicate to Astra in writing,
     within thirty (30) days after receipt of Astra's notice, that Millennium
     and the acquiring party confirm this Agreement and agree to the continued
     performance of all obligations of Millennium under this Agreement. If
     Millennium and the acquiring party fail to so confirm and agree in writing
     within such thirty (30) day period, Astra shall have the right to terminate
     this Agreement immediately upon providing written notice thereof to
     Millennium.

          (c) As used in this Section 20.7, the term "Change of Control" shall
     mean (i) a merger or consolidation of Astra or Millennium, as the case may
     be, which results in the voting securities of Astra or Millennium
     outstanding immediately prior thereto ceasing to represent at least fifty
     percent (50%) of the combined voting power of the surviving entity
     immediately after such merger or consolidation; (ii) the sale of all or
     substantially all of the assets of Astra or Millennium, as the case may be;
     or (iii) any "person," as such term is used in Sections 13(d) and 14(d) of
     the Securities Exchange Act of 1934, as amended (the "Exchange Act") (other
     than Astra or Millennium, as the case may be, any trustee or other
     fiduciary holding securities under an employee benefit plan of Astra or
     Millennium, as the case may be, or any corporation owned directly or
     indirectly by the stockholders of Astra or Millennium, as the case may be,
     in substantially the same proportion as their ownership of stock of Astra
     or Millennium, as the case may be), together with any of such person's
     "affiliates" or "associates," as such terms are used in the Exchange Act,
     becoming the beneficial owner of fifty percent (50%) or more of the
     combined voting power of the outstanding securities of Astra or Millennium,
     as the case may be.


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<PAGE>   65


     SECTION 20.8 ENTIRE AGREEMENT. This Agreement and the Appendices attached
hereto (which Appendices are deemed to be a part of this Agreement) represent
the full understanding of the Parties with respect to the subject matter hereof
and supersede all prior understandings and writings relating thereto, including
the terms of the Original Agreement, and the provisions of the Original
Agreement are hereby terminated and of no further force and effect. No waiver,
alteration or modification of any of the provisions hereof shall be binding
unless made in writing and signed by the Parties.

     IN WITNESS WHEREOF, this Agreement is executed this 17th day of December,
1998, to be effective as of the Effective Date.

                                        MILLENNIUM PHARMACEUTICALS,
ASTRA AB                                INC.
 /s/ Hakan Mogren                        /s/ Mark J. Levin
------------------------------          --------------------------------
Hakan Mogren                            Mark J. Levin


President and Chief Executive           
Officer                                 Chief Executive Officer         
------------------------------          --------------------------------
Title                                   Title


December 17, 1998                       December 14, 1998
------------------------------          --------------------------------
Date                                    Date




                                       59


<PAGE>   66



                                   APPENDIX A

                                       TO
                         RESEARCH AND LICENSE AGREEMENT
                                 BY AND BETWEEN
                                    ASTRA AB
                                       AND
                        MILLENNIUM PHARMACEUTICALS, INC.
                          DATED AS OF DECEMBER 9, 1995

                              RESEARCH PROGRAM PLAN






                                       60



<PAGE>   67



                                   APPENDIX B

                                       TO
                         RESEARCH AND LICENSE AGREEMENT
                                 BY AND BETWEEN
                                    ASTRA AB
                                       AND
                        MILLENNIUM PHARMACEUTICALS, INC.
                          DATED AS OF DECEMBER 9, 1995

                     THIRD PARTY AGREEMENTS WITH MILLENNIUM

A.   Third Party Agreements relating to Millennium Field Know-How

     Sponsored Research and Collaboration Agreement between Millennium
     Pharmaceuticals, Inc. and The General Hospital Corporation (Dr. Bernard
     Kinane), dated July 15, 1995.

     Agreement between Millennium Pharmaceuticals, Inc. and Megathlin, Sigler
     and Chilmonczyk MDPA, dated June 15, 1995.

     Sponsored Research and Collaboration Agreement between Millennium
     Pharmaceuticals, Inc. and the Brigham and Women's Hospital (Dr. Ziping Xu),
     dated September 1, 1994.

     Cooperative Research and Development Agreement (CRADA) between the National
     Institutes of Health (Dr. William Paul) and Millennium Pharmaceuticals,
     Inc., dated May 31, 1995.

B.   Third Party Agreements relating to Millennium Core Technology Know-How

     License Agreement between the Dana-Farber Cancer Institute, Inc. and
     Millennium Pharmaceuticals, Inc., dated May 15, 1995.





                                       61


<PAGE>   68


                                   APPENDIX C

                                       TO
                         RESEARCH AND LICENSE AGREEMENT
                                 BY AND BETWEEN
                                    ASTRA AB
                                       AND
                        MILLENNIUM PHARMACEUTICALS, INC.

                      SMALL MOLECULE PROCESS FLOW SCHEDULE

Stage I.   Gene Discovery and Expression Analysis -- identification of: Pre-
           Candidate Gene

Stage II.  Validations Studies -- identification of: Candidate Gene
                                     or
           Genetics Studies -- identification of: Genetics Candidate Gene

Stage III. Research Assay Development -- identification of: Validated Target

Stage IV.  Small Molecule High Throughput Screening -- identification of: Hit

Stage V.   Exploratory Chemistry -- identification of: Lead

Stage VI.  Medicinal Chemistry -- identification of: Candidate Drug




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