Document:

INTERNATIONAL AIRLINE SUPPORT GROUP - BROAD BASED RESTRICTED STOCK PLAN

INTERNATIONAL AIRLINE SUPPORT GROUP, INC.

BROAD-BASED

RESTRICTED STOCK PLAN

TABLE OF CONTENTS

Page

o 1 BACKGROUND AND
PURPOSE                       
1

o 2
DEFINITIONS                                                      
1

2.1
Board                                                                     
1

2.2 Change in
Control                                                   
1

2.3
Code                                                                      
3

2.4
Disabled                                                                 
3

2.5
Employee                                                               
3

2.6
IASG                                                                     
3

2.7 1933
Act                                                               
3

2.8 1934
Act                                                               
3

2.9
Plan                                                                       
3

2.10 Restricted Stock
Grant                                         
3

2.11 Rule
16b-3                                                          
4

2.12
Stock                                                                  
4

o 3 SHARES RESERVED UNDER
PLAN                
4

o 4 EFFECTIVE
DATE                                              
4

o 5
ADMINISTRATION                                           
4

o 6
ELIGIBILITY                                                       
5

o 7 RESTRICTED STOCK
GRANTS                       
5

7.1 Initial
Grants                                                         
5

7.2 Issuance of
Stock                                                 
6

7.3 Voting and Other
Rights                                        
6

7.4
Forfeitures                                                            
7

7.5 Forfeited
Stock                                                     
7

o 8
NON-TRANSFERABILITY                               
8

o 9 RESALE
RESTRICTIONS                                 
9

o 10
ADJUSTMENT                                                
9

10.1 Capital
Structure                                                
9

10.2
Mergers                                                          
10

10.3 Fractional
Shares                                            
10

o 11 AMENDMENT OR
TERMINATION            10

o 12
MISCELLANEOUS                                       
11

12.1 No Contract of
Employment                             
11

12.2
Withholding                                                     
11

12.3
Construction                                                    
11

12.4 Other
Conditions                                              
11

12.5 Rule
16b-3                                                      
12

o 1

BACKGROUND AND PURPOSE

The purpose of this Plan is to promote the interest of IASG by authorizing the
Board to make Restricted Stock Grants to Employees in order to (1) attract and
retain Employees, (2) provide an additional incentive to each Employee to work
to increase the value of Stock and (3) provide each Employee with a stake in the
future of IASG.

o 2

DEFINITIONS

2.1 Board -- means the Board of Directors of IASG.

2.2 Change in Control -- means:

(1) A "person" or "group" (within the meaning of o 13(d)
and o 14(d)(2) of the 1934 Act) becomes, is determined by the Board (acting in
good faith) to be, or files a report on Schedule 13D, 13G or 14D-2 (or any
successor schedule, form or report) disclosing that such person or group is the
ultimate "beneficial owner" (as defined in Rule 13d-3 under the 1934
Act) of securities representing more than twenty-five percent (25%) of the
combined voting power of IASG's then outstanding securities ordinarily having
the right to vote at an election of directors; provided, however, that the
acquisition by IASG, by its subsidiaries, by any employee benefit plan sponsored
by IASG or by IASG's Chief Executive Officer or Chief Operating Officer of
securities representing more than twenty-five percent (25%) of such voting power
shall not constitute a Change in Control;

(2) individuals who, on the effective date of this Plan, constitute the members
of the Board (together with any new members who were appointed to the Board by
individuals who, on the effective date of this Plan, constitute the members of
the Board or whose nomination for election to the Board was approved by the then
incumbent Chairman of the Board and disregarding any director who resigned from
the Board in the ordinary course of business) cease for any reason to constitute
at least seventy-five percent (75%) of the members of the Board then in office;

(3) the sale of all or substantially all of IASG's assets in one transaction or
a series of related transactions to any person or group;

(4) IASG is merged, consolidated or reorganized into or with another corporation
or other legal person, or securities of IASG are exchanged for securities of
another corporation or other legal person, and immediately after such merger,
consolidation, reorganization or exchange less than fifty percent (50%) of the
combined voting power of the then-outstanding securities of such corporation or
person immediately after such transaction are held, directly or indirectly, in
the aggregate by the holders of securities entitled to vote generally in the
election of the members of the Board immediately prior to such transaction;

(5) the stockholders of IASG or the Board shall take any action in contemplation
of the liquidation or dissolution of IASG; or

(6) any other transaction or series of related transactions occur that have
substantially the effect of the transactions specified in any of the preceding
sections of this definition of a Change in Control.

2.3 Code -- means the Internal Revenue Code of 1986, as amended.

2.4 Disabled -- means a mental or physical condition which an Employee has on
the date his or her employment with IASG terminates which in the judgment of
IASG's Chief Executive Officer acting in his or her absolute discretion or, if
the affected Employee is such officer, in the judgment of the Board acting in
its absolute discretion renders such Employee unable to perform the essential
functions of his or her job.

2.5 Employee -- means each individual who is classified on IASG's payroll and
personnel records as a regular, full-time employee of IASG and each other
individual who is classified on IASG's payroll and personnel records as an
employee of IASG who the Board in its discretion determines to treat as a
regular, full-time employee of IASG for purposes of this Plan.

2.6 IASG -- means International Airline Support Group, Inc., a Delaware
corporation, and any successor to International Airline Support Group, Inc.

2.7 1933 Act -- means the Securities Act of 1933, as amended.

2.8 1934 Act -- means the Securities Exchange Act of 1934, as amended.

2.9 Plan -- means this International Airline Support Group, Inc. Broad-Based
Restricted Stock Plan as effective as of the date adopted by the Board and as
amended from time to time thereafter.

2.10 Restricted Stock Grant -- means a grant of Stock made to an Employee under o
7.

2.11 Rule 16b-3 -- means the exemption under Rule 16b?3 to Section 16(b) of the
1934 Act or any successor to such rule.

2.12 Stock -- means the common stock, par value $.001 per share, of IASG.

o 3

SHARES RESERVED UNDER PLAN

There shall (subject to o 10) be 167,800 shares of Stock reserved for issuance
under this Plan. Such shares of Stock shall be reserved to the extent that IASG
deems appropriate from authorized but unissued shares of Stock and from shares
of Stock that have been reacquired by IASG. Any shares of Stock which have been
issued as part of a Restricted Stock Grant which thereafter are forfeited under o
7.4 shall again become available for issuance under 7.5. Any shares of Stock
used to satisfy a tax withholding obligation shall not thereafter become
available for issuance under this Plan.

o 4

EFFECTIVE DATE

The effective date of this Plan shall be the date of its adoption by the Board.

o 5

ADMINISTRATION

This Plan shall be administered by IASG's Chief Executive Officer or his or her
delegate. IASG's Chief Executive officer acting in his or her absolute
discretion shall exercise such powers and take such action (except for powers
and actions expressly reserved for the Board) as he or she deems appropriate and
proper under the circumstance, including the power to interpret this Plan and
take such other action in the administration and operation of this Plan as he or
she deems equitable under the circumstances, which action shall be binding on
IASG, on each affected Employee and on each other person directly or indirectly
affected by such action. However, any decisions with respect to any Restricted
Stock Grant made to IASG's Chief Executive Officer shall be made by the Board.

o 6

ELIGIBILITY

Only Employees shall be eligible for Restricted Stock Grants under this Plan.

o 7

RESTRICTED STOCK GRANTS

7.1 Initial Grants. The Board as of the effective date of this Plan under o 4
shall make a Restricted Stock Grant to every individual who is an Employee on
such date. All such grants shall be made subject to all the terms and conditions
of this Plan and shall be evidenced by a letter to each such Employee from
IASG's Chief Executive Officer or his or her delegate. The Board in its
discretion shall determine the number of shares of Stock subject to each such
Restricted Stock Grant, but the total number of shares of Stock subject to all
such Restricted Stock Grants shall equal the number of shares of Stock reserved
for issuance under this Plan.

7.2 Issuance of Stock. The Stock subject to each Restricted Stock Grant shall
(subject to o 12.4) be issued in the name of the Employee as of the date that
the Employee properly executes the irrevocable stock power in favor of IASG
which IASG presents to such Employee and which gives IASG the right to forfeit
the shares of Stock subject to such grant in accordance with o 7.4, and no
Stock shall be issued under this Plan in the name of an Employee if he or she
fails to execute such irrevocable stock power. Such irrevocable stock power
shall expire if and when the Stock subject to such stock power no longer is
subject to forfeiture under o 7.4. Each such stock certificate which represents
shares of Stock issued as part of a Restricted Stock Grant shall be held by IASG
until the related Stock has been forfeited under o 7.4 or such Stock is no
longer subject to forfeiture under o 7.4. IASG shall (subject to o 9 and o 12.4) deliver the stock certificate which represents shares of Stock which no
longer are subject to forfeiture under o 7.4 to the Employee to whom the
related Restricted Stock Grant was made as soon as practicable after such shares
no longer are subject to forfeiture.

7.3 Voting and Other Rights. An Employee shall have the right to vote all the
shares of Stock subject to a Restricted Stock Grant made to that Employee while
the Stock remains issued in his or her name and shall have the right to receive
any cash dividends declared on such Stock while such Stock remains issued in his
or her name. Any distributions made with respect to any Stock subject to a
Restricted Stock Grant other than cash dividends shall be held by IASG subject
to the same forfeiture conditions as the Stock subject to the related Restricted
Stock Grant and either shall be forfeited under o 7.4 when the Stock subject to
such grant is forfeited or delivered to the Employee when the Stock subject to
the grant is no longer subject to forfeiture.

7.4 Forfeitures. An Employee shall forfeit 100% of the Stock subject to each and
every Restricted Stock Grant made to such Employee if his or her employment with
IASG terminates for any reason whatsoever before the fifth anniversary of the
effective date of this Plan under o 4 unless (1) his or her employment with
IASG terminates as a result of his or her death, in which event the Stock
subject to each of his or her outstanding Restricted Stock Grants shall become
non-forfeitable on the date his or her employment so terminates, (2) his or her
employment terminates because he or she is Disabled, in which event the Stock
subject to each of his or her outstanding Restricted Stock Grants shall become
non-forfeitable on the date his or her employment so terminates or (3) there is
a Change in Control, in which event the Stock subject to each outstanding
Restricted Stock Grant shall become non-forfeitable on the date of such Change
in Control. Each and every share of Stock which is subject to an outstanding
Restricted Stock Grant which was forfeitable immediately before the fifth
anniversary of the effective date of this Plan under o 4 shall become
non-forfeitable on the fifth anniversary of such effective date.

7.5 Forfeited Stock. The Board as of the last day of IASG's fiscal year (and as
of any other date or dates in a calendar year which the Board acting in its
absolute discretion selects) shall make Restricted Stock Grants with respect to
the shares of Stock which have been forfeited under o 7.4 and which are then
available for issuance under o 3. Whenever a Restricted Stock Grant is made
under this o 7.5 to any Employee, a grant shall be made as of the same date to
every other individual who is an Employee on such date, and each such grant
shall be made subject to all the terms and conditions of this Plan and shall be
evidenced by a letter to each such Employee from IASG's Chief Executive Officer
or his or her delegate. The Board in its discretion shall determine the number
of shares of Stock subject to each such Restricted Stock Grant, but the total
number of shares of Stock subject to all Restricted Stock Grants made as of any
date shall equal the number of shares of Stock then available for issuance under
o 3.

o 8

NON-TRANSFERABILITY

No Stock subject to a Restricted Stock Grant which remains subject to forfeiture
under o 7.4 shall (absent the Board's consent) be transferable by an Employee
other than by will or by the laws of descent and distribution and, if the Board
consents to such a transfer, the person or persons to whom the Stock is
transferred thereafter shall be treated as the Employee and the shares of Stock
so transferred shall remain subject to all the terms and conditions of this
Plan. The person or persons to whom Stock subject to a Restricted Stock grant is
transferred by will or by the laws of descent and distribution thereafter shall
be treated as the Employee, and the shares of Stock so transferred shall remain
subject to all the terms and conditions of this Plan

o 9

RESALE RESTRICTIONS

Each Employee who is an officer or director of IASG shall be advised through the
delivery of a copy of this Plan that the shares of Stock subject to a Restricted
Stock Grant made to him or to her have been registered with the Securities and
Exchange Commission under the 1933 Act in a Registration Statement on Form S-8.
However, each such Employee also shall be advised through the delivery of a copy
of this Plan that, (i) because, such Employee may be deemed to be an affiliate
of IASG and (ii) because the sale or distribution by such Employee of such Stock
has not been registered under the 1933 Act, such Employee may not sell, transfer
or otherwise dispose of Stock issued to such Employee unless (x) such sale,
transfer or other disposition is made in conformity with the volume and other
limitations of the 1933 Act, (y) such sale, transfer or other disposition has
been registered under the 1933 Act or (z) in the written opinion of counsel
reasonably acceptable to IASG, such sale, transfer or other disposition is
otherwise exempt from registration under the 1933 Act.

o 10

ADJUSTMENT

10.1 Capital Structure. The number, kind or class (or any combination thereof)
of shares of Stock reserved under o 3 and the number, kind or class (or any
combination thereof) of shares of Stock subject to outstanding Restricted Stock
Grants under this Plan shall be adjusted by the Board in an equitable manner as
determined by the Board to reflect any change in the capitalization of IASG,
including, but not limited to, such changes as stock dividends or stock splits.

10.2 Mergers. The Board as part of any corporate transaction described in o 424(a) of the Code shall have the right to adjust (in any manner that the Board
in its discretion deems consistent with o 424(a) of the Code) the number, kind
or class (or any combination thereof) of shares of Stock reserved under o 3.
Furthermore, the Board as part of any corporate transaction described in o 424(a) of the Code shall have the right to adjust (in any manner that the Board
in its discretion deems consistent with o 424(a) of the Code) the number, kind
or class (or any combination thereof) of shares of Stock subject to any
outstanding Restricted Stock Grants.

10.3 Fractional Shares. If any adjustment under this o 10 would create a
fractional share of Stock or a right to acquire a fractional share of Stock,
such fractional share shall be disregarded and the number of shares of Stock
reserved under this Plan and the number subject to outstanding Restricted Stock
grants shall be the next lower number of shares of Stock, rounding all fractions
downward. An adjustment made under this o 10 by the Board shall be conclusive
and binding on all affected persons.

o 11

AMENDMENT OR TERMINATION

This Plan may be amended by the Board from time to time to the extent that the
Board deems necessary or appropriate; provided, however, the Board shall not
have the right unilaterally to modify, amend or cancel any outstanding
Restricted Stock Grant unless the Employee to whom such grant was made consents
in writing to such modification, amendment or cancellation.

o 12

MISCELLANEOUS

12.1 No Contract of Employment. A Restricted Stock Grant made to an Employee
under this Plan shall not constitute a contract of employment and shall not
confer on an Employee any rights upon his or her termination of employment in
addition to those rights expressly set forth in this Plan.

12.2 Withholding. Each Restricted Stock Grant shall be made subject to the
condition that the Employee consents to whatever action the Board directs to
satisfy the minimum statutory federal and state tax withholding requirements, if
any, that IASG determines are applicable to the Restricted Stock Grant when the
Stock subject to such grant no longer is subject to forfeiture under o 7.4.

12.3 Construction. All references to sections (o) are to sections (o) of this
Plan unless otherwise indicated. This Plan shall be construed under the laws of
the State of Delaware. Each term set forth in o 2 shall have the meaning set
forth opposite such term for purposes of this Plan and, for purposes of such
definitions, the singular shall include the plural and the plural shall include
the singular.

12.4 Other Conditions. IASG may require that an Employee (as a condition to the
issuance of Stock as part of a Restricted Stock Grant or the delivery of the
stock certificate representing such shares of Stock) enter into any agreement or
make such representations prepared by IASG, including (without limitation) any
agreement that restricts the transfer of Stock acquired pursuant to a Restricted
Stock Grant or provides for the repurchase of such Stock by IASG.

12.5 Rule 16b-3. The Board shall have the right to amend any Restricted Stock
Grant or to withhold or otherwise restrict the transfer of any Stock under this
Plan to an Employee as the Board deems appropriate in order to satisfy any
condition or requirement under Rule 16b-3.

IN WITNESS WHEREOF, IASG has caused its duly authorized officer to execute
this Plan to evidence its adoption of this Plan.

INTERNATIONAL AIRLINE SUPPORT GROUP, INC.

By:____________________________

Date:__________________________101501 S8S3 CALYDON, INC

Calydon, Inc.

Management Incentive and Retention Plan, As Amended

      1. Purpose of Plan. The purpose of this plan is to
establish a management incentive and retention plan that will provide incentives
to designated senior management employees of Calydon, Inc. ("Calydon") to remain
in employment with Calydon for a period of time up to and through the sale or
transfer of all or substantially all the assets of Calydon or a merger or
consolidation that results in shareholders immediately prior to such transaction
not holding at least 50% of the voting power of the surviving, continuing or
purchasing entity (a "Sale").

      2. Effective Date. The effective date of this plan is
June 15, 2001.

      3. Eligibility and Amount of Retention Payment.
Calydon employees designated by the Board of Directors (the "Board") and
identified in a notice approved by the Board and signed by Calydon's Chief
Executive Officer or Chairman of the Compensation Committee of the Board of
Directors (each a "Designated Employee") shall be eligible to receive a
retention payment on terms set forth in the signed written notice (as shown in
Exhibit A) and this plan. Calydon will pay, in cash or other consideration, an
incentive and retention bonus to Designated Employees up to an aggregate amount
of 10% of the net proceeds of a Sale after payment of all related expenses
(including without limitation all counsel and investment banking fees). Such
bonus shall be paid immediately upon receipt of such net proceeds after payment
of all indebtedness of Calydon (including without limitation all bridge loans
and other indebtedness owed to Calydon's shareholders) but prior to any amounts
being paid or distributed to Calydon shareholders in respect of their capital
stock. The amount to be paid to any Designated Employee (as specified in Exhibit
A hereto) shall not be increased or decreased by the failure of any other
Designated Employee to satisfy the conditions for payment of a retention bonus
to such other Designated Employee.

      4. Conditions for Retention Payments.

      (a)   Conditions for Retention Payments. Subject to the
consummation of a Sale, a Designated Employee shall be entitled to receive the
retention payment referred to in Section 3 above provided that the Designated
Employee:

(i)   keeps confidential this plan and his eligibility and
rights under this plan (except with respect to his family and tax or legal
advisors provided they agree to keep this plan confidential), and 

(ii)   remains in continuous employment with Calydon through the
consummation of a Sale or through such shorter period of time if his employment
with Calydon is: (1) terminated as a result of his death or "Disability" (as
defined below), or (2) involuntarily terminated by Calydon for reasons other
than for "Cause" (as defined below).

      (b)   Defined Terms.

(i)   Cause Defined. For purpose of this retention plan,
the term "Cause" means the following conduct on the part of a Designated
Employee, as reasonably determined by the Board:

(1)   the commission by the Designated Employee of an act of
criminal or fraudulent misconduct in the line of duty to Calydon, an act that
constitutes a conflict of interest with Calydon or the shareholders of Calydon
or a breach of a fiduciary duty owed by the Designated Employee to Calydon or
the shareholders of Calydon;

(2)   the Designated Employee's habitual absence from work,
intentional failure to perform stated duties, consistent manipulation or
avoidance of Calydon's policies or procedures, negligence or incompetence in the
performance of stated duties with Calydon;

(3)   the Designated Employee's alcohol or drug abuse that
results in an impairment of the Designated Employee's ability to perform his
duties as an employee of Calydon; or

(4)   the rendering of a verdict of guilty against the
Designated Employee for (or the entry of a plea of nolo contendre or no contest
with respect to) any criminal offense (other than a misdemeanor traffic
violation or similar offense), whether or not in the line of duty.

(ii)   Disability Defined. For purposes of this plan, the
term "Disability" means a physical or mental illness or injury that prevents the
Designated Employee from performing any duties for Calydon as reasonably
determined in good faith by the Board.

      5. Offsets and Withholding; Parachute Excise Tax.

      (a)
Calydon will withhold applicable federal, state, local and foreign income and
employment taxes from any payments under this plan.

      (b)Notwithstanding any other provision of this plan to
the contrary, if any benefit provided under this Plan (the "Plan Benefits")
along with any other cash payment, acceleration of vesting of a stock option, or
other benefit (collectively referred to as "Other Benefits") would (i)
constitute a "parachute payment" within the meaning of the term in Section 280G
of the Internal Revenue Code of 1986, as amended (the "Code"), and (ii) but for
this sentence, be subject to the excise tax imposed by Section 4999 of the Code
(the "Excise Tax"), then such Plan Benefit shall be reduced ,if necessary, to
produce the largest after-tax benefit of the total of the Plan Benefits and
Other Benefits to the Eligible Employee after taking into account all applicable
federal, state and local employment taxes, income taxes and the Excise Tax (all
computed at the highest applicable marginal rates).

      6. Nonexclusivity. Nothing herein shall prevent,
limit or affect any Designated Employee's continuing or future participation in
any benefit, bonus, incentive or other plans, programs, policies or practices
provided by Calydon and for which the Designated Employee may otherwise qualify.
Except as otherwise expressly provided herein, amounts which are vested benefits
or payments or which a Designated Employee is otherwise entitled to receive
under any other plan, policy, practice or program, or as a Calydon shareholder,
at or subsequent to the date of termination shall be payable in accordance with
such plan, policy, practice or program.

      7. Employment Status. This plan does not constitute a
contract of employment or impose on Calydon any obligation (i) to retain any
Designated Employee as an employee, (ii) to change the status of the Designated
Employee's employment, or (iii) to change the policies of Calydon regarding
termination of employment (including termination at-will employment).

      8. Duration. This plan shall remain in effect from
the effective date until December 31, 2001; provided, however,
that the Board may renew the plan for an indeterminate number of additional one
year terms. 

      9. No Amendment or Termination. The Board may amend
or terminate this plan at any time at its discretion; provided,
however, that no amendment which adversely affects any Designated
Employee's rights under this plan shall be effective after any Designated
Employee has been notified of his or her eligibility and potential benefits
under this plan, unless such Designated Employee consents in writing to such
amendment. This plan shall not terminate or expire with respect to any
Designated Employee who becomes entitled to any retention payment hereunder
until such Designated Employee shall have received such payment in full as
required under this plan.

      10. Non-ERISA Plan. This plan is a bonus plan and not
an "employee benefit plan" within the meaning of that term as defined in Section
3(3) of the federal Employee Retirement Income Security Act.

Exhibit A

Written Notice to Eligible Employees

June 15, 2001 

 

		
	
Dr. Daniel Henderson, President and CEO

                   Dr. D.-C. Yu, VP Research

                   Dr. Rukmini Pennathur-Das

	
60% of the 10% 

                   30% of the 10%

                   10% of the 10% 

		
	
_____________________________________

                   Dr. Daniel Henderson, CEO

	
_____________________________________

                   Mr. Kenneth  Kelley, Chairman

Compensation Committee of the 

Board of Directors

Amendment to the Management Incentive and Retention
Plan

      This Amendment (the "Amendment") to the Management
Incentive and Retention Plan (the "Retention Plan") is entered into as of the
1st day of August, 2001 by Calydon, Inc. (the "Company" or "Calydon") and Daniel
Henderson (the "Participant").

RECITALS

      A.The Company and Cell Genesys, Inc. have entered into an
Agreement and Plan of Reorganization (the "Reorganization Agreement") by and
among Cell Genesys, Inc., Satellite Acquisition Corporation, and the Company
pursuant to which the Company will become a wholly owned subsidiary of Cell
Genesys, Inc. (the "Merger"). 

      B.If the Merger closes, the Reorganization Agreement
provides that Cell Genesys, Inc. shall assume the obligations of the Company
pursuant to the Retention Plan.

AGREEMENT

      1.   In the event the Merger closes, payments under the
Retention Plan to the Participant shall be made solely in accordance with this
Amendment. In the event that the Merger does not close, the original terms of
the Retention Plan shall govern the rights of the Participant and this Amendment
shall have no force or effect.

      2.   In the event that the Merger closes, the Participant
shall receive from Cell Genesys, Inc. 47,850 shares of common stock of Cell
Genesys, Inc. (the "Share Payment") and $15.63 in cash. The Participant agrees
that once he has received the Share Payment, after giving effect to the
reductions set forth in paragraphs 3 and 4 of this Amendment, such Share Payment
shall fulfill any and all obligations owed to the Participant under the
Retention Plan and this Amendment by the Company, Cell Genesys, Inc. or any
affiliate or successor of the Company or Cell Genesys, Inc.

      3.   Cell Genesys, Inc. shall withhold applicable federal and
state income and employment taxes from the Share Payment made to the
Participant. If no Withholding Election (as defined below) is made by the
Participant, Cell Genesys, Inc. shall withhold 28% of the Share Payment for
federal income tax purposes, 6% of the Share Payment for state income tax
purposes and 1.45% of the Share Payment for hospital insurance tax purposes.
Notwithstanding the foregoing, the Participant may elect (a "Withholding
Election") to have Cell Genesys, Inc. withhold additional amounts from the Share
Payment, so long as the total amounts to be withheld do not exceed 39.1% of the
Share Payment for federal income tax purposes, 9.3% of the Share Payment for
state income tax purposes and 1.45% of the Share Payment for hospital insurance
tax purposes. A Withholding Election, if any, shall be made by the Participant
by delivering a written notice to the Company at least one week prior to the
closing of the Merger specifying the percentage to be withheld in accordance
with the preceding sentence. For purposes of this paragraph, the value of the
Share Payment shall be determined by multiplying the number of Cell Genesys,
Inc. common shares in the Share Payment (after any Cut Back pursuant to
paragraph 4 but prior to any withholding pursuant to this paragraph) by the mean
between the high and low of the trading price of Cell Genesys, Inc.'s common
stock as traded during regular trading hours on the Nasdaq National
Market.

      4.   Notwithstanding any other provision of this Amendment to
the contrary, if any benefit provided under this Amendment ("Plan Benefit")
along with any other cash payment, acceleration of vesting of a stock option, or
other benefit, including any benefit provided under the Executive Change of
Control Severance Benefit Plan (such benefits other than the Plan Benefit and,
with respect to Daniel R. Henderson, other than the Consulting Agreement being
entered into by and between Cell Genesys, Inc. and Daniel R. Henderson, being
collectively referred to as "Other Benefits") would (i) constitute a "parachute
payment" within the meaning of the term in Section 280G of the Internal Revenue
Code of 1986, as amended (the "Code"), and (ii) but for this sentence, be
subject to the excise tax imposed by Section 4999 of the Code (the "Excise
Tax"), then, unless shareholder approval of such Plan Benefit, to the extent
that it constitutes "excess parachute payments" within the meaning of Code
Section 280G(b)(1) and the proposed Treasury Regulations thereunder, is obtained
in accordance with Code Section 280G(b)(5)(B) and the proposed Treasury
Regulations thereunder, such Other Benefits shall be reduced to the greatest
amount as would result in no portion of the Plan Benefit or Other Benefits being
subject to the Excise Tax. In the event Other Benefits are reduced to zero and a
portion of the Plan Benefit would be subject to the Excise Tax, the Plan Benefit
shall be reduced to the greatest amount as would result in no portion of the
Plan Benefit or Other Benefits being subject to the Excise Tax (the "Cut Back").
In the event shares of common stock of Cell Genesys, Inc. are not paid to the
Participant due to the Cut Back, such shares of common stock not paid to the
Participant shall be referred to as the "Cut Back Shares."

      5.   Nothing herein shall prevent, limit or affect the
Participant's continuing or future participation in any benefit, bonus,
incentive or other plans, programs, policies or practices provided by Calydon
and for which the Participant may otherwise qualify. Except as otherwise
expressly provided herein, amounts which are vested benefits or payments or
which the Participant is otherwise entitled to receive under any other plan,
policy, practice or program, or as a Calydon shareholder, at or subsequent to
the date of termination shall be payable in accordance with such plan, policy,
practice or program.

      6.   The Board of Directors of the Company may amend or
terminate this Amendment at any time at its discretion; provided,
however, that no amendment which adversely affects the Participant's rights
under this Amendment shall be effective, unless the Participant consents in
writing to such amendment.

      7.   This Amendment does not constitute a contract of
employment or impose on Calydon any obligation (i) to retain the Participant as
an employee, (ii) to change the status of the Participant's employment, or (iii)
to change the policies of Calydon regarding termination of employment (including
termination at-will employment).

      8.   This Amendment and the Severance Plan (as amended
effective upon the closing of the Merger) constitute the entire agreement of the
parties with respect to the subject matter hereof and may only be amended by
means of a writing signed by the Participant, the Company and the President of
Cell Genesys, Inc.

IN WITNESS WHEREOF, the Company and the Participant have
executed this Amendment as of the date first above written.

Calydon, Inc.

By:________________________________

[Title]

      The undersigned Participant acknowledges receipt of the
foregoing Amendment and agrees to the amendment of the Retention Plan with
respect to his participation therein as set forth in this Amendment.

		
	 	
Participant

_____________________________________

[Name]

Amendment to the Management Incentive and Retention
Plan

      This Amendment (the "Amendment") to the Management
Incentive and Retention Plan (the "Retention Plan") is entered into as of the
1st day of August, 2001 by Calydon, Inc. (the "Company" or "Calydon") and
Rukmini Pennathur-Das (the "Participant").

RECITALS

      A.The Company and Cell Genesys, Inc. have entered into an
Agreement and Plan of Reorganization (the "Reorganization Agreement") by and
among Cell Genesys, Inc., Satellite Acquisition Corporation, and the Company
pursuant to which the Company will become a wholly owned subsidiary of Cell
Genesys, Inc. (the "Merger"). 

      B.If the Merger closes, the Reorganization Agreement
provides that Cell Genesys, Inc. shall assume the obligations of the Company
pursuant to the Retention Plan.

AGREEMENT

      1.   In the event the Merger closes, payments under the
Retention Plan to the Participant shall be made solely in accordance with this
Amendment. In the event that the Merger does not close, the original terms of
the Retention Plan shall govern the rights of the Participant and this Amendment
shall have no force or effect.

      2.   In the event that the Merger closes, the Participant
shall receive from Cell Genesys, Inc. 7,975 shares of common stock of Cell
Genesys, Inc. (the "Share Payment") and $2.61 in cash. The Participant agrees
that once he has received the Share Payment, after giving effect to the
reductions set forth in paragraphs 3 and 4 of this Amendment, such Share Payment
shall fulfill any and all obligations owed to the Participant under the
Retention Plan and this Amendment by the Company, Cell Genesys, Inc. or any
affiliate or successor of the Company or Cell Genesys, Inc.

      3.   Cell Genesys, Inc. shall withhold applicable federal and
state income and employment taxes from the Share Payment made to the
Participant. If no Withholding Election (as defined below) is made by the
Participant, Cell Genesys, Inc. shall withhold 28% of the Share Payment for
federal income tax purposes, 6% of the Share Payment for state income tax
purposes and 1.45% of the Share Payment for hospital insurance tax purposes.
Notwithstanding the foregoing, the Participant may elect (a "Withholding
Election") to have Cell Genesys, Inc. withhold additional amounts from the Share
Payment, so long as the total amounts to be withheld do not exceed 39.1% of the
Share Payment for federal income tax purposes, 9.3% of the Share Payment for
state income tax purposes and 1.45% of the Share Payment for hospital insurance
tax purposes. A Withholding Election, if any, shall be made by the Participant
by delivering a written notice to the Company at least one week prior to the
closing of the Merger specifying the percentage to be withheld in accordance
with the preceding sentence. For purposes of this paragraph, the value of the
Share Payment shall be determined by multiplying the number of Cell Genesys,
Inc. common shares in the Share Payment (after any Cut Back pursuant to
paragraph 4 but prior to any withholding pursuant to this paragraph) by the mean
between the high and low of the trading price of Cell Genesys, Inc.'s common
stock as traded during regular trading hours on the Nasdaq National
Market.

      4.   Notwithstanding any other provision of this Amendment to
the contrary, if any benefit provided under this Amendment ("Plan Benefit")
along with any other cash payment, acceleration of vesting of a stock option, or
other benefit, including any benefit provided under the Executive Change of
Control Severance Benefit Plan (such benefits other than the Plan Benefit and,
with respect to Daniel R. Henderson, other than the Consulting Agreement being
entered into by and between Cell Genesys, Inc. and Daniel R. Henderson, being
collectively referred to as "Other Benefits") would (i) constitute a "parachute
payment" within the meaning of the term in Section 280G of the Internal Revenue
Code of 1986, as amended (the "Code"), and (ii) but for this sentence, be
subject to the excise tax imposed by Section 4999 of the Code (the "Excise
Tax"), then, unless shareholder approval of such Plan Benefit, to the extent
that it constitutes "excess parachute payments" within the meaning of Code
Section 280G(b)(1) and the proposed Treasury Regulations thereunder, is obtained
in accordance with Code Section 280G(b)(5)(B) and the proposed Treasury
Regulations thereunder, such Other Benefits shall be reduced to the greatest
amount as would result in no portion of the Plan Benefit or Other Benefits being
subject to the Excise Tax. In the event Other Benefits are reduced to zero and a
portion of the Plan Benefit would be subject to the Excise Tax, the Plan Benefit
shall be reduced to the greatest amount as would result in no portion of the
Plan Benefit or Other Benefits being subject to the Excise Tax (the "Cut Back").
In the event shares of common stock of Cell Genesys, Inc. are not paid to the
Participant due to the Cut Back, such shares of common stock not paid to the
Participant shall be referred to as the "Cut Back Shares."

      5.   Nothing herein shall prevent, limit or affect the
Participant's continuing or future participation in any benefit, bonus,
incentive or other plans, programs, policies or practices provided by Calydon
and for which the Participant may otherwise qualify. Except as otherwise
expressly provided herein, amounts which are vested benefits or payments or
which the Participant is otherwise entitled to receive under any other plan,
policy, practice or program, or as a Calydon shareholder, at or subsequent to
the date of termination shall be payable in accordance with such plan, policy,
practice or program.

      6.   The Board of Directors of the Company may amend or
terminate this Amendment at any time at its discretion; provided,
however, that no amendment which adversely affects the Participant's rights
under this Amendment shall be effective, unless the Participant consents in
writing to such amendment.

      7.   This Amendment does not constitute a contract of
employment or impose on Calydon any obligation (i) to retain the Participant as
an employee, (ii) to change the status of the Participant's employment, or (iii)
to change the policies of Calydon regarding termination of employment (including
termination at-will employment).

      8.   This Amendment and the Severance Plan (as amended
effective upon the closing of the Merger) constitute the entire agreement of the
parties with respect to the subject matter hereof and may only be amended by
means of a writing signed by the Participant, the Company and the President of
Cell Genesys, Inc.

IN WITNESS WHEREOF, the Company and the Participant have
executed this Amendment as of the date first above written.

Calydon, Inc.

By:____________________________________

[Title]

      The undersigned Participant acknowledges receipt of the
foregoing Amendment and agrees to the amendment of the Retention Plan with
respect to his participation therein as set forth in this Amendment.

		
	 	
Participant

_____________________________________

[Name]

Amendment to the Management Incentive and Retention
Plan

      This Amendment (the "Amendment") to the Management
Incentive and Retention Plan (the "Retention Plan") is entered into as of the
1st day of August, 2001 by Calydon, Inc. (the "Company" or "Calydon") and De
Chao Yu (the "Participant").

RECITALS

      A.The Company and Cell Genesys, Inc. have entered into an
Agreement and Plan of Reorganization (the "Reorganization Agreement") by and
among Cell Genesys, Inc., Satellite Acquisition Corporation, and the Company
pursuant to which the Company will become a wholly owned subsidiary of Cell
Genesys, Inc. (the "Merger"). 

      B.If the Merger closes, the Reorganization Agreement
provides that Cell Genesys, Inc. shall assume the obligations of the Company
pursuant to the Retention Plan.

AGREEMENT

      1.   In the event the Merger closes, payments under the
Retention Plan to the Participant shall be made solely in accordance with this
Amendment. In the event that the Merger does not close, the original terms of
the Retention Plan shall govern the rights of the Participant and this Amendment
shall have no force or effect.

      2.   In the event that the Merger closes, the Participant
shall receive from Cell Genesys, Inc. 23,925 shares of common stock of Cell
Genesys, Inc. (the "Share Payment") and $7.82 in cash. The Participant agrees
that once he has received the Share Payment, after giving effect to the
reductions set forth in paragraphs 3 and 4 of this Amendment, such Share Payment
shall fulfill any and all obligations owed to the Participant under the
Retention Plan and this Amendment by the Company, Cell Genesys, Inc. or any
affiliate or successor of the Company or Cell Genesys, Inc.

      3.   Cell Genesys, Inc. shall withhold applicable federal and
state income and employment taxes from the Share Payment made to the
Participant. If no Withholding Election (as defined below) is made by the
Participant, Cell Genesys, Inc. shall withhold 28% of the Share Payment for
federal income tax purposes, 6% of the Share Payment for state income tax
purposes and 1.45% of the Share Payment for hospital insurance tax purposes.
Notwithstanding the foregoing, the Participant may elect (a "Withholding
Election") to have Cell Genesys, Inc. withhold additional amounts from the Share
Payment, so long as the total amounts to be withheld do not exceed 39.1% of the
Share Payment for federal income tax purposes, 9.3% of the Share Payment for
state income tax purposes and 1.45% of the Share Payment for hospital insurance
tax purposes. A Withholding Election, if any, shall be made by the Participant
by delivering a written notice to the Company at least one week prior to the
closing of the Merger specifying the percentage to be withheld in accordance
with the preceding sentence. For purposes of this paragraph, the value of the
Share Payment shall be determined by multiplying the number of Cell Genesys,
Inc. common shares in the Share Payment (after any Cut Back pursuant to
paragraph 4 but prior to any withholding pursuant to this paragraph) by the mean
between the high and low of the trading price of Cell Genesys, Inc.'s common
stock as traded during regular trading hours on the Nasdaq National
Market.

      4.   Notwithstanding any other provision of this Amendment to
the contrary, if any benefit provided under this Amendment ("Plan Benefit")
along with any other cash payment, acceleration of vesting of a stock option, or
other benefit, including any benefit provided under the Executive Change of
Control Severance Benefit Plan (such benefits other than the Plan Benefit and,
with respect to Daniel R. Henderson, other than the Consulting Agreement being
entered into by and between Cell Genesys, Inc. and Daniel R. Henderson, being
collectively referred to as "Other Benefits") would (i) constitute a "parachute
payment" within the meaning of the term in Section 280G of the Internal Revenue
Code of 1986, as amended (the "Code"), and (ii) but for this sentence, be
subject to the excise tax imposed by Section 4999 of the Code (the "Excise
Tax"), then, unless shareholder approval of such Plan Benefit, to the extent
that it constitutes "excess parachute payments" within the meaning of Code
Section 280G(b)(1) and the proposed Treasury Regulations thereunder, is obtained
in accordance with Code Section 280G(b)(5)(B) and the proposed Treasury
Regulations thereunder, such Other Benefits shall be reduced to the greatest
amount as would result in no portion of the Plan Benefit or Other Benefits being
subject to the Excise Tax. In the event Other Benefits are reduced to zero and a
portion of the Plan Benefit would be subject to the Excise Tax, the Plan Benefit
shall be reduced to the greatest amount as would result in no portion of the
Plan Benefit or Other Benefits being subject to the Excise Tax (the "Cut Back").
In the event shares of common stock of Cell Genesys, Inc. are not paid to the
Participant due to the Cut Back, such shares of common stock not paid to the
Participant shall be referred to as the "Cut Back Shares."

      5.   Nothing herein shall prevent, limit or affect the
Participant's continuing or future participation in any benefit, bonus,
incentive or other plans, programs, policies or practices provided by Calydon
and for which the Participant may otherwise qualify. Except as otherwise
expressly provided herein, amounts which are vested benefits or payments or
which the Participant is otherwise entitled to receive under any other plan,
policy, practice or program, or as a Calydon shareholder, at or subsequent to
the date of termination shall be payable in accordance with such plan, policy,
practice or program.

      6.   The Board of Directors of the Company may amend or
terminate this Amendment at any time at its discretion; provided,
however, that no amendment which adversely affects the Participant's rights
under this Amendment shall be effective, unless the Participant consents in
writing to such amendment.

      7.   This Amendment does not constitute a contract of
employment or impose on Calydon any obligation (i) to retain the Participant as
an employee, (ii) to change the status of the Participant's employment, or (iii)
to change the policies of Calydon regarding termination of employment (including
termination at-will employment).

      8.   This Amendment and the Severance Plan (as amended
effective upon the closing of the Merger) constitute the entire agreement of the
parties with respect to the subject matter hereof and may only be amended by
means of a writing signed by the Participant, the Company and the President of
Cell Genesys, Inc.

IN WITNESS WHEREOF, the Company and the Participant have
executed this Amendment as of the date first above written.

Calydon, Inc.

By:____________________________________

[Title]

      The undersigned Participant acknowledges receipt of the
foregoing Amendment and agrees to the amendment of the Retention Plan with
respect to his participation therein as set forth in this Amendment.

		
	 	
Participant

_____________________________________

[Name]

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