Document:

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                                                                Exhibit 4.2

                                 AMENDMENT TO

              AMENDED AND RESTATED PREFERRED STOCK RIGHTS AGREEMENT

         This amendment (the "AMENDMENT"), dated as of January 5, 2003, to the
Amended and Restated Preferred Stock Rights Agreement (the "RIGHTS AGREEMENT"),
dated as of December 19, 2001, between ProBusiness Services, Inc., a Delaware
corporation (the "COMPANY"), and Wells Fargo Bank, MN N.A., is being executed at
the direction of the Company.

         WHEREAS, the Company, Automatic Data Processing, Inc., a Delaware
corporation ("PARENT"), and ADP Merger Corp., a Delaware corporation and
indirect wholly owned subsidiary of Parent ("MERGER SUB"), intend to enter into
an Agreement and Plan of Merger pursuant to which, among other things, Merger
Sub will merge with and into the Company and each remaining share of capital
stock of the Company will be converted into the right to receive cash, upon the
terms and subject to the conditions of the Merger Agreement;

         WHEREAS, on January 5, 2003, the Board of Directors of the Company
resolved to amend the Rights Agreement to render the Rights inapplicable to the
Merger Agreement (as defined below), the Merger (as defined below) and the other
transactions contemplated by the Merger Agreement; and

         WHEREAS, Section 27 of the Rights Agreement permits the Company from
time to time to supplement and amend the Rights Agreement.

         NOW, THEREFORE, in consideration of the foregoing and the agreements,
provisions and covenants herein contained, the parties agree as follows:

         1. Section 1(q) of the Rights Agreement is hereby amended to read in
its entirety as follows:

         "EXPIRATION DATE" shall mean the earliest to occur of: (i) the Close of
Business on the Final Expiration Date, (ii) the Redemption Date, (iii) the time
at which the Board of Directors orders the exchange of the Rights as provided in
Section 24 hereof, or (iv) upon the Effective Time (as such term in defined in
the Agreement and Plan of Merger, dated as of January 5, 2003, including any
amendment or supplement thereto (the "MERGER AGREEMENT") by and among the
Company, Automatic Data Processing, Inc., a Delaware corporation ("PARENT"), and
ADP Merger Corp., a Delaware corporation and indirect wholly owned subsidiary of
Parent).

         2. Section 1 of the Rights Agreement is hereby amended by adding the
following new paragraph at the end of Section 1:

         "Notwithstanding anything in this Agreement that might otherwise be
deemed to the contrary, neither Parent nor any of its Affiliates or Associates
shall be deemed an Acquiring Person and none of the Distribution Date, Shares
Acquisition Date, Section 13 Event or Triggering Event shall be deemed to occur,
in each such case, by the approval, execution, delivery or performance of the
Merger Agreement among Parent, ADP Merger Corp., an indirect wholly owned
subsidiary of Parent, and the Company, the announcement or consummation of the
Merger (as defined in the Merger
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Agreement) or the other transactions specifically contemplated by the Merger
Agreement, including the approval, execution, delivery or performance of the
Stockholder Agreements (as defined in the Merger Agreement), between Parent and
certain stockholders of the Company. No such event shall entitle or permit the
holders of the Rights to exercise the Rights or otherwise affect the rights of
the holders of Rights, including giving the holders of the Rights the right to
acquire securities of any party to the Merger Agreement."

         5. The Rights Agreement shall not otherwise be supplemented or amended
by virtue of this Amendment, but shall remain in full force and effect. This
Amendment may be executed in one or more counterparts, all of which shall be
considered one and the same amendment and each of which shall be deemed an
original.

         6. This Amendment shall be deemed a contract made under the laws of the
State of Delaware and for all purposes shall be governed by and construed in
accordance with the laws of such State applicable to contracts to be made and
performed entirely within such State.

                           [SIGNATURE PAGE TO FOLLOW]

                                       2.
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         IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be
duly executed and attested, all as of the day and year first above written.

PROBUSINESS SERVICES, INC.                       WELLS FARGO BANK, MN N.A.
                                                 as Rights Agent

By: /s/ Thomas H. Sinton                         By: /s/ John Baker
    -----------------------------                    ---------------------------
Name:  Thomas H. Sinton                          Name:  John Baker
Title: President and Chief                       Title:  Assistant Vice
       Executive Officer                                 PresidentForm of Warrant

  
  
 EXHIBIT 4.5 
 DIVERSA CORPORATION 
  
 WARRANT FOR THE
PURCHASE OF SHARES OF 
 COMMON STOCK OF DIVERSA CORPORATION 
  
 
	 No.: Syngenta-1
 	 	 Warrant to Purchase
               [        ] Shares
 

 
  
 THIS SECURITY HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT
OF 1933, AS AMENDED, OR ANY STATE SECURITIES LAWS AND MAY NOT BE OFFERED OR SOLD OR OTHERWISE TRANSFERRED EXCEPT IN COMPLIANCE THEREWITH. 
  
 FOR VALUE RECEIVED, DIVERSA CORPORATION, a Delaware corporation (the “Company”), hereby certifies that SYNGENTA PARTICIPATIONS AG, its successor or permitted assigns (the
“Holder”), is entitled, subject to the provisions of this Warrant, to purchase from the Company, at the times specified herein, [        ] fully paid and non-assessable shares of Common Stock
of the Company, par value $.001 per share (the “Common Stock”), at a purchase price per share equal to the Exercise Price (as hereinafter defined). The number of shares of Common Stock to be received upon the exercise of this
Warrant and the price to be paid for a share of Common Stock are subject to adjustment from time to time as hereinafter set forth. 
  

	 	1.    Definitions.
	 
	(a) The following terms, as used herein, have the following meanings: 
 

  
 “Affiliate” means, with respect to any Person, any other Person directly or indirectly controlling, controlled by, or under common control with such
Person. 
  
 “Common Stock” means the Common Stock, par value $.001 per share, of the Company.

  
 “Exercise Price” means $22 per Warrant Share, such Exercise Price to be adjusted from time to
time as provided herein. 
  
 “Expiration Date” means the fifteenth anniversary of the Closing Date
at 5:00 p.m. New York City time. 
  
 “Person” means an individual, partnership, corporation, trust,
joint stock company, association, joint venture, or any other entity or organization, including a government or political subdivision or an agency or instrumentality thereof. 
  
 “Principal Holder” means the original Holder of this Warrant on the date of issue, or if such original Holder so elects, any transferee pursuant to the

  

 
 1 

  
 provisions of this Agreement of all or any portion of this Warrant whom such original Holder shall have
designated by written notice to the Company as the successor Principal Holder. Any successor Principal Holder designated pursuant to the immediately preceding sentence shall also have the right upon any subsequent transfer pursuant to the provisions
of this Warrant to designate a successor Principal Holder in the manner described above. 
  
 “Transaction
Agreement” means the Transaction Agreement dated as of December 3, 2002 among the Company, the Holder and Torrey Mesa Research Institute, a Delaware corporation. 
  
 “Warrant Shares” means the shares of Common Stock deliverable upon exercise of this Warrant, as adjusted from time to time. 
  
 (b)    Capitalized terms used but not defined herein shall have the meanings assigned to such terms in the Transaction
Agreement. 
  

	 	2.
	 
	Exercise of Warrant. 
 

  
 (a)    The Holder is entitled to exercise this Warrant in whole or in part at any time, or from time to time, commencing on the fifth anniversary of the Closing Date and ending on the Expiration Date or,
if any such day is not a Business Day, then on the next succeeding day that shall be a Business Day. To exercise this Warrant, the Holder shall execute and deliver to the Company a Warrant Exercise Notice substantially in the form annexed hereto.
Subject to paragraph 2(e) below, no earlier than ten days after delivery of the Warrant Exercise Notice, the Holder shall deliver to the Company this Warrant Certificate, including the Warrant Exercise Subscription Form forming a part hereof duly
executed by the Holder, together with payment of the applicable Exercise Price. At the close of business on the date of such delivery and payment, the Holder shall be deemed to be the holder of record of the Warrant Shares subject to such exercise,
notwithstanding that the stock transfer books of the Company shall then be closed or that certificates representing such Warrant Shares shall not then be actually delivered to the Holder. 
  
 (b)    The Exercise Price may be paid in cash or by certified or official bank check or bank cashier’s check payable to the order of the Company or
by any combination of such cash or check. The Company shall pay any and all documentary, stamp or similar issue or transfer taxes payable in respect of the issue or delivery of the Warrant Shares; provided that the Company shall not be
required to pay any tax which may be payable in respect of any transfer involved in the issuance and delivery of the Warrant Shares in a name other than that of the then Holder of this Warrant. 
  

(c)    If the Holder exercises this Warrant in part, this Warrant Certificate shall be surrendered by the Holder to the Company and a new Warrant

 
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 Certificate of the same tenor and for the unexercised number of Warrant Shares shall be executed by the
Company within a reasonable time. The Company shall register the new Warrant Certificate in the name of the Holder or in such name or names of its transferee pursuant to the provisions of this Warrant as may be directed in writing by the Holder and
deliver the new Warrant Certificate to the Person or Persons entitled to receive the same as promptly as reasonably practicable. 
  
 (d)  Upon surrender of this Warrant Certificate in conformity with the foregoing provisions, the Company shall, as promptly as reasonably practicable, transfer to the Holder of this Warrant Certificate appropriate evidence
of ownership of the shares of Common Stock or other securities or property (including any money) to which the Holder is entitled, registered or otherwise placed in, or payable to the order of, the name or names of the Holder or such transferee
pursuant to the provisions of this Warrant as may be directed in writing by the Holder, and shall, as promptly as reasonably practicable, deliver such evidence of ownership and any other securities or property (including any money) to the Person or
Persons entitled to receive the same, together with an amount in cash in lieu of any fraction of a share as provided in paragraph 5 below. 
  
 (e)  In lieu of making the cash payment required to exercise the Warrant pursuant to paragraph 2(a) (but in all other respects in accordance with the exercise procedure set forth in paragraph 2(a)), the Holder may
elect to convert this Warrant into shares of Common Stock, in which event the Company will issue to the Holder the number of shares of Common Stock equal to the result obtained under the following equation: 
  
 X = (A - B) x C where: 
                         A 
  
 
	 
	 X =
 	  	 the number of shares of Common Stock issuable upon exercise pursuant to this paragraph 2(e).
 
	 
	 A =
 	  	 the Current Market Price Per Common Share (as defined below) on the date on which the Holder delivers the Warrant Exercise Subscription Form pursuant to
paragraph 2(a).
 
	 
	 B =
 	  	 the Exercise Price.
 
	 
	 C =
 	  	 the number of shares of Common Stock as to which this Warrant is being exercised pursuant to paragraph 2(a).
 

 
  
 If the foregoing calculation results in a negative number, then no
shares of Common Stock shall be issued upon exercise pursuant to this paragraph 2(e). 

 
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 3.    Restrictive Legend; Restrictions on Transfer.
Certificates representing shares of Common Stock issued pursuant to this Warrant shall bear a legend substantially in the form of the legend set forth on the first page of this Warrant Certificate until such time as such legend is removed pursuant
to Section 6.04 of the Transaction Agreement. The Holder agrees not to make any transfer or disposition of all or any portion of the Warrant Shares unless (a) there is then in effect a registration statement under the 1933 Act covering such proposed
transfer or disposition and such transfer or disposition is made in accordance with such registration statement, (b) such transfer or disposition is made in accordance with Rule 144 under the 1933 Act or (c) (i) the transferee has agreed in writing
to be bound by these transfer restrictions, (ii) the Holder shall have notified the Company of the proposed transfer or disposition and shall have furnished the Company with a reasonably detailed statement of the circumstances surrounding the
proposed transfer or disposition (but not necessarily the economic terms thereof) and (iii) if reasonably requested by the Company and the transfer is not to an Affiliate of the Holder, the Holder shall have furnished the Company with an opinion of
counsel, reasonably satisfactory to the Company, that such transfer or disposition does not require registration of the Warrant Shares under the 1933 Act. The Holder agrees not to make any transfer or disposition of all or any portion of this
Warrant unless (v) the transferee is an Affiliate of the Holder or the transferee is, substantially concurrently with the transfer, purchasing at least [        ]1 shares of Common Stock from the Holder, (w) this Warrant is transferred or disposed of in whole or in a portion representing at least 250,000
Warrant Shares, (x) the transferee has agreed in writing to be bound by these transfer restrictions, (y) the Holder shall have notified the Company of the proposed transfer or disposition and shall have furnished the Company with a reasonably
detailed statement of the circumstances surrounding the proposed transfer or disposition (but not necessarily the economic terms thereof) and (z) if reasonably requested by the Company and the transfer is not to an Affiliate of the Holder, the
Holder shall have furnished the Company with an opinion of counsel, reasonably satisfactory to the Company, that such transfer or disposition does not require registration of this Warrant under the 1933 Act. 
  
 4.    Reservation of Shares. The Company hereby agrees that at all times there shall be reserved for issuance
and delivery upon exercise of this Warrant such number of its authorized but unissued shares of Common Stock or other securities of the Company from time to time issuable upon exercise of this Warrant as will be sufficient to permit the exercise in
full of this Warrant. All such shares shall be duly authorized and, when issued upon such exercise, shall be validly issued, fully paid and non-assessable, free and clear of all liens, 
  
 
1 Half of the total shares of Diversa Common Stock (excluding the Warrant) held by Syngenta as of Closing. 

 
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 security interests, charges and other encumbrances or (except as contemplated in the legend referred to in Section 3) restrictions on sale and
free and clear of all preemptive rights. 
  
 5.    Fractional Shares. No fractional shares
or scrip representing fractional shares shall be issued upon the exercise of this Warrant and in lieu of delivery of any such fractional share upon any exercise hereof, the Company shall pay to the Holder an amount in cash equal to such fraction
multiplied by the Current Market Price Per Common Share on the date on which the Holder delivers the Warrant Exercise Subscription Form pursuant to paragraph 2(a). 
  
 “Current Market Price Per Common Share” on any date shall be the average of the Daily Prices (as defined below) per share of the applicable class of Common
Stock for the 20 consecutive trading days immediately prior to such date. “Daily Price” means (A) the last reported sale price on such day on the National Market of the National Association of Securities Dealers, Inc. Automated
Quotation System (not identified as having been reported late to such system) (“NASDAQ”); or (B) if the shares of such class of Common Stock then are not traded on the NASDAQ National Market, the closing price (at the close of the
regular trading session) on such day as reported by the principal national securities exchange on which the shares are listed and traded, or, if not so listed and traded, the average of the highest reported bid and lowest reported asked price on
such day as reported by NASDAQ. If on any determination date the shares of such class of Common Stock are not quoted by any such organization, the Current Market Price Per Common Share shall be the fair market value of such shares on such
determination date as determined by the Board of Directors. If the Principal Holder shall object to any determination by the Board of Directors of the Current Market Price Per Common Share, the Current Market Price Per Common Share shall be the fair
market value per share of the applicable class of Common Stock as determined by an independent appraiser retained by the Principal Holder and reasonably acceptable to the Company. The expense of such independent appraiser shall be shared equally by
the Company and Principal Holder. 
  
 6.    Exchange, Transfer or Assignment of Warrant.

  
 (a)  Subject to compliance with applicable federal and state securities laws and the provisions of the
Warrant, this Warrant Certificate and all rights hereunder are transferable by the registered holder hereof. Each taker and holder of this Warrant Certificate by taking or holding the same, consents and agrees that the registered holder hereof may
be treated by the Company and all other persons dealing with this Warrant Certificate as the absolute owner hereof for any purpose and as the person entitled to exercise the rights represented hereby. 

 
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 (b)  Subject to compliance with applicable federal and state securities
laws and the provisions of this Warrant, the Holder of this Warrant shall be entitled to assign and transfer this Warrant, at any time in whole or from time to time in part (subject to Section 3 hereof, without obtaining the consent of the Company),
to any Person or Persons. Subject to the preceding sentence, upon surrender of this Warrant to the Company, together with the attached Warrant Assignment Form duly executed, the Company shall, as promptly as reasonably practicable, without charge,
execute and deliver a new Warrant in the name of the assignee or assignees named in such instrument of assignment and, if the Holder’s entire interest is not being assigned, in the name of the Holder and this Warrant shall promptly be canceled.

  
 7.    Loss or Destruction of Warrant. Upon receipt by the Company of evidence
satisfactory to it (in the exercise of its reasonable discretion) of the loss, theft, destruction or mutilation of this Warrant Certificate, and (in the case of loss, theft or destruction) of reasonably satisfactory indemnification, and upon
surrender and cancellation of this Warrant Certificate, if mutilated, the Company shall execute and deliver a new Warrant Certificate of like tenor and date. 
  
 8.    Anti-dilution Provisions. 
  
 (a)  In case the Company shall at any time after the date hereof subdivide or split its outstanding shares of Common Stock into a greater number of shares, the Exercise Price in effect immediately prior to such subdivision
or split shall be proportionately reduced and the number of shares of Common Stock purchasable under this Warrant shall be proportionately increased. Conversely, in case the outstanding shares of Common Stock shall be combined or reclassified into a
smaller number of shares, the Exercise Price in effect immediately prior to such combination or reclassification shall be proportionately increased and the number of shares of Common Stock purchasable under this Warrant shall be proportionately
decreased. In case the Company shall at any time after the date hereof declare a dividend or make a distribution on Common Stock payable in Common Stock, the Exercise Price in effect at the time of the record date for such dividend or distribution
and the aggregate number of shares of Common Stock receivable upon exercise of this Warrant shall be proportionately adjusted so that the exercise of this Warrant in full after such time shall entitle the Holder to receive (for the Aggregate
Exercise Price (as defined below)) the aggregate number of shares of Common Stock which, if this Warrant had been exercised in full immediately prior to such time (for the aggregate Exercise Price in effect at such time (the “Aggregate
Exercise Price”)), such Holder would have owned upon such exercise and been entitled to receive by virtue of such dividend or distribution. If any declared dividend or distribution on Common Stock payable in Common Stock for which
adjustments have been made pursuant to the immediately preceding sentence is not paid in whole or in part on the applicable payment date, then, effective as of the time of the record date for such dividend or 

 
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 distribution, the Exercise Price and the aggregate number of shares of Common Stock receivable upon
exercise of this Warrant shall be proportionately readjusted so that the exercise of this Warrant in full after such time shall entitle the Holder to receive (for the Aggregate Exercise Price) the aggregate number of shares of Common Stock which, if
this Warrant had been exercised in full immediately prior to such time (for the Aggregate Exercise Price), such Holder would have owned upon such exercise and in fact received by virtue of such dividend or distribution. In case the Company shall at
any time after the date hereof issue any shares of its capital stock in a reclassification of Common Stock (including any such reclassification in connection with a consolidation or merger in which the Company is the continuing corporation), then,
as a condition to such reclassification, lawful provisions shall be made, and duly executed documents evidencing the same from the Company or its successor shall be delivered to the Holder, so that the Holder shall have the right at any time that
this Warrant is exercisable to purchase, at a total price equal to that payable upon exercise of this Warrant, the kind and amount of capital stock receivable in connection with such recapitalization by a record holder of the same number of shares
of Common Stock as were purchasable by the Holder immediately prior to such recapitalization. Such adjustments shall be made successively whenever any event listed above shall occur. 
  
 (b)  In case the Company shall issue or sell any Common Stock (other than Common Stock issued (i) upon exercise of this Warrant, (ii) pursuant to the
Company’s employee stock option plans or employee stock purchase plans or pursuant to any similar Common Stock related employee compensation plan of the Company approved by the Board of Directors, (iii) pursuant to the terms of any
arm’s-length “PIPE” or similar financing which by its customary commercial terms (in an arm’s-length transaction) involves the issuance of Common Stock at a discount to the Current Market Price Per Common Share (provided
that such discount shall not exceed 10%), (iv) to the underwriters in any public offering of Common Stock registered under the 1933 Act at a reasonable discount based on prevailing market conditions, (v) to the counterparty pursuant to the terms
of any arm’s-length and unaffiliated equity line of credit financing which by its customary commercial terms (in an arm’s-length transaction) involves the issuance of Common Stock at a discount to the Current Market Price Per Common Share
(provided that (A) such discount shall not exceed 5% and (B) the resale of the Common Stock subject to the equity line of credit financing arrangement is registered under the 1933 Act), (vi) upon exercise or conversion of any security the
issuance of which caused an adjustment under paragraph 8(c) or 8(d) hereof) without consideration or for a consideration per share less than the Current Market Price Per Common Share, the Exercise Price to be in effect after such issuance or sale
shall be determined by multiplying the Exercise Price in effect immediately prior to such issuance or sale by a fraction, the numerator of which shall be the sum of (x) the number of shares of Common Stock outstanding immediately prior to the time
of such issuance or sale multiplied by the Current 

 
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 Market Price Per Common Share immediately prior to such issuance or sale and (y) the aggregate
consideration, if any, to be received by the Company upon such issuance or sale, and the denominator of which shall be the product of the aggregate number of shares of Common Stock outstanding immediately after such issuance or sale and the Current
Market Price Per Common Share immediately prior to such issuance or sale. In case any portion of the consideration to be received by the Company shall be in a form other than cash, the fair market value of such noncash consideration shall be
utilized in the foregoing computation. Such fair market value shall be determined by the Board of Directors; provided that if the Principal Holder shall object to any such determination, such fair market value shall be as determined by an
independent appraiser retained by the Principal Holder and reasonably acceptable to the Company. The expense of such independent appraiser shall be shared equally by the Company and Principal Holder. The Holder shall be notified promptly of any
consideration other than cash to be received by the Company and furnished with a description of the consideration and the fair market value thereof, as determined by the Board of Directors. Such adjustments shall be made successively whenever any
event listed above shall occur. 
  
 (c)  In case the Company shall fix a record date for the issuance of
rights, options or warrants to the holders of its Common Stock or other securities entitling such holders to subscribe for or purchase for a period expiring within 60 days of such record date shares of Common Stock (or securities convertible into
share of Common Stock) at a price per share of Common Stock (or having a conversion price per share of Common Stock, if a security convertible into shares of Common Stock) less than the Current Market Price Per Common Share on such record date, the
maximum number of shares of Common Stock issuable upon exercise of such rights, options or warrants (or conversion of such convertible securities) shall be deemed to have been issued and outstanding as of such record date and the Exercise Price
shall be adjusted pursuant to paragraph 8(b) hereof, as though such maximum number of shares of Common Stock had been so issued for the aggregate consideration payable by the holders of such rights, options, warrants or convertible securities prior
to their receipt of such shares of Common Stock. In case any portion of such consideration shall be in a form other than cash, the fair market value of such noncash consideration shall be determined as set forth in paragraph 8(b) hereof. Such
adjustment shall be made successively whenever any such record date is fixed; and in the event that such rights, options or warrants or securities convertible into shares of Common Stock are not so issued or expire unexercised, or in the event of a
change in the number of shares of Common Stock to which the holders of such rights, options or warrants or securities convertible into shares of Common Stock are entitled or the aggregate consideration payable by the holders of such rights, options,
warrants or convertible securities for such shares of Common Stock prior to their receipt of such shares of Common Stock (other than pursuant to adjustment provisions therein comparable to those contained in this paragraph 8), the Exercise Price

 
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 shall again be adjusted to be the Exercise Price which would then be in effect if such rights, options
or warrants or securities convertible into shares of Common Stock that were not so issued or expired unexercised had never had their related record date fixed, in the former event, or the Exercise Price which would then be in effect if such holder
had initially been entitled to such changed number of shares of Common Stock or required to pay such changed consideration, in the latter event. 
  
 (d)  In case the Company shall issue rights, options (other than options issued pursuant to a plan described in clause 8(b)(ii)) or warrants entitling the holders thereof to subscribe for or
purchase Common Stock (or securities convertible into shares of Common Stock) or shall issue convertible securities (other than any securities issued in an arm’s-length “PIPE” or similar financing which by its customary commercial
terms (in an arm’s-length transaction) involves the issuance of Common Stock at a discount to the Current Market Price Per Common Share (provided that such discount shall not exceed 10%)), and the price per share of Common Stock of such
rights, options, warrants or convertible securities (including, in the case of rights, options or warrants, the price at which they may be exercised) is less than the Current Market Price Per Common Share, the maximum number of shares of Common
Stock issuable upon exercise of such rights, options or warrants or upon conversion of such convertible securities shall be deemed to have been issued and outstanding as of the date of such sale or issuance, and the Exercise Price shall be adjusted
pursuant to paragraph 8(b) hereof as though such maximum number of shares of Common Stock had been so issued for an aggregate consideration equal to the aggregate consideration paid for such rights, options, warrants or convertible securities and
the aggregate consideration payable by the holders of such rights, options, warrants or convertible securities prior to (and in respect of) their receipt of such shares of Common Stock. In case any portion of such consideration shall be in a form
other than cash, the fair market value of such noncash consideration shall be determined as set forth in paragraph 8(b) hereof. Such adjustment shall be made successively whenever such rights, options, warrants or convertible securities are issued;
and in the event that such rights, options or warrants or convertible securities expire unexercised, or in the event of a change in the number of shares of Common Stock to which the holders of such rights, options, warrants or convertible securities
are entitled or the aggregate consideration payable by the holders of such rights, options, warrants or convertible securities for such shares of Common Stock prior to their receipt of such shares of Common Stock, whether upon the issuance of the
rights, options, warrants or convertible securities or upon the issuance of the Common Stock (other than pursuant to adjustment provisions therein comparable to those contained in this paragraph 8), the Exercise Price shall again be adjusted to be
the Exercise Price which would then be in effect if such rights, options, warrants or convertible securities had not been issued, in the former event, or the Exercise Price which would then be in effect if such holders had initially been entitled to
such changed number of shares of Common Stock or 

 
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 required to pay such changed consideration, in the latter event. No adjustment of the Exercise Price
shall be made pursuant to this paragraph 8(d) to the extent that the Exercise Price shall have been adjusted pursuant to paragraph 8(c) upon the setting of any record date relating to such rights, options, warrants or convertible securities and such
adjustment fully reflects the number of shares of Common Stock to which the holders of such rights, options, warrants or convertible securities are entitled and the price payable therefor. 
  
 (e) In case the Company shall fix a record date for the making of a distribution to holders of Common Stock (including any such distribution made in connection with a
consolidation or merger in which the Company is the continuing corporation) of evidences of indebtedness, assets or other property (other than (i) dividends payable in Common Stock or (ii) rights, options or warrants or convertible securities
referred to in, and for which an adjustment is made pursuant to, paragraph 8(c) hereof), the Exercise Price to be in effect after such record date shall be determined by multiplying the Exercise Price in effect immediately prior to such record date
by a fraction, the numerator of which shall be the Current Market Price Per Common Share on such record date, less the fair market value (determined as set forth in paragraph 8(b) hereof) of the portion of the assets, other property or evidence of
indebtedness so to be distributed which is applicable to one share of Common Stock, and the denominator of which shall be such Current Market Price Per Common Share. Such adjustments shall be made successively whenever such a record date is fixed;
and in the event that such distribution is not so made, the Exercise Price shall again be adjusted to be the Exercise Price which would then be in effect if such record date had not been fixed. 
  

(f) No adjustment in the Exercise Price or otherwise pursuant to paragraphs 8(a) through (e) shall be required unless such adjustment would require an increase or
decrease of at least one percent in such price; provided that any adjustments which by reason of this paragraph 8(f) are not required to be made shall be carried forward and taken into account in any subsequent adjustment. All calculations
under this paragraph 8 shall be made to the nearest one tenth of a cent or to the nearest hundredth of a share, as the case may be. 
  
 (g) In the event that, at any time as a result of the provisions of this paragraph 8, the holder of this Warrant upon subsequent exercise shall become entitled to receive any shares of capital stock of the Company other than
Common Stock, the number of such other shares so receivable upon exercise of this Warrant shall thereafter be subject to adjustment from time to time in a manner and on terms as nearly equivalent as practicable to the provisions contained herein.

  
 (h) Notwithstanding any other provision to the contrary, no adjustment in the Exercise Price or otherwise
pursuant to paragraphs 8(a) through 

 
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 (e) shall be required as a result of any of the following, in and of itself: (i) the issuance of any
rights under the Rights Plan in connection with the issuance of any shares of Common Stock after December 22, 2000 pursuant to the declaration of the dividend of rights under the Rights Plan by the Board of Directors on December 13, 2000 or (ii) the
issuance of any rights under any shareholder rights plan of the Company approved by the Board of Directors upon termination of the Rights Plan or expiration of the rights issued thereunder. 
  
 9.    Consolidation, Merger, or Sale of Assets.  In case of any consolidation of the Company with, or merger of the Company into, any
other Person, any merger of another Person into the Company (other than a consolidation or merger which does not result in any reclassification, conversion, exchange or cancellation of outstanding shares of Common Stock) or any sale or transfer of
all or substantially all of the assets of the Company or of the Person formed by such consolidation or resulting from such merger or which acquires such assets, as the case may be, the Holder shall have the right thereafter, upon exercise of this
Warrant in accordance with and subject to all of the provisions of this Warrant, to receive the kind and amount of securities, cash and other property receivable upon such consolidation, merger, sale or transfer by a holder of the number of shares
of Common Stock for which this Warrant may have been exercised immediately prior to such consolidation, merger, sale or transfer, assuming (i) such holder of Common Stock is not a Person with which the Company consolidated or into which the Company
merged or which merged into the Company or to which such sale or transfer was made, as the case may be (“constituent Person”), or an Affiliate of a constituent Person and (ii) in the case of a consolidation, merger, sale or transfer
which includes an election as to the consideration to be received by the holders, such holder of Common Stock failed to exercise its rights of election, as to the kind or amount of securities, cash and other property receivable upon such
consolidation, merger, sale or transfer (provided that if the kind or amount of securities, cash and other property receivable upon such consolidation, merger, sale or transfer is not the same for each share of Common Stock held immediately
prior to such consolidation, merger, sale or transfer by other than a constituent Person or an Affiliate thereof and in respect of which such rights of election shall not have been exercised (“non-electing share”), then for the
purpose of this paragraph 9 the kind and amount of securities, cash and other property receivable upon such consolidation, merger, sale or transfer by each non-electing share shall be deemed to be the kind and amount so receivable per share by a
plurality of the non-electing shares). Adjustments for events subsequent to the effective date of such a consolidation, merger and sale of assets shall be as nearly equivalent as may be practicable to the adjustments provided for in this Warrant. In
any such event, effective provisions shall be made in the certificate or articles of incorporation of the resulting or surviving corporation, in any contract of sale, conveyance, lease or transfer, or otherwise so that the provisions set forth
herein for the protection of the rights of the Holder shall thereafter continue to be applicable; and any such 

 
 11 

 resulting or surviving corporation shall expressly assume the obligation to deliver, upon exercise, such shares of stock, other securities, cash
and property. The provisions of this paragraph 9 shall similarly apply to successive consolidations, mergers, sales, leases or transfers. 
  
 10.    Notices.  Any notice, demand or delivery authorized by this Warrant Certificate shall be in writing and shall be given to the Holder or the Company, as the case may be, at its
address (or telecopier number) set forth below, or such other address (or telecopier number) as shall have been furnished to the party giving or making such notice, demand or delivery: 
  
 If to the Company: 
  
 Diversa Corporation 
 4955 Directors Place 
 San Diego, California 92121 
 Attention:  Karin Eastham 
 Fax:  858-526-5605 
  
 with a copy to: 
  
 Cooley Godward LLP 
 4401 Eastgate Mall 
 San Diego, California
92121 
 Attention:  Carl R. Sanchez, Esq. 
 Fax:  858-550-6420 
  
 If to the Holder: 
  
 Syngenta Participations AG 
 Schwarzwaldallee 215 
 CH-4002 Basel 
 Switzerland 
 Attention:  President 
 Fax:  (41) 61-323-7571 
  
 with a copy to: 

 
 Davis Polk & Wardwell 
 450 Lexington Avenue 
 New York, New York 10017 
 Attention:  Louis Goldberg, Esq. 
 Fax:  (212) 450-3800 
  
 Each such notice, demand or delivery shall be effective (i) if given by telecopy, when
such telecopy is transmitted to the telecopy number specified herein and the 

 
 12 

  
 intended recipient confirms the receipt of such telecopy or (ii) if given by any other means, when
received at the address specified herein. 
  
 11.    Rights of the
Holder.  Prior to the exercise of any Warrant, the Holder shall not, by virtue hereof, be entitled to any rights of a shareholder of the Company, including, without limitation, the right to vote, to receive dividends or other
distributions, to exercise any preemptive right or to receive any notice of meetings of shareholders or any notice of any proceedings of the Company except as may be specifically provided for herein. 
  
 12.    GOVERNING LAW.  THIS WARRANT CERTIFICATE AND ALL RIGHTS ARISING HEREUNDER SHALL BE
CONSTRUED AND DETERMINED IN ACCORDANCE WITH THE INTERNAL LAWS OF THE STATE OF NEW YORK, AND THE PERFORMANCE THEREOF SHALL BE GOVERNED AND ENFORCED IN ACCORDANCE WITH SUCH LAWS.  
  

13.    Amendments; Waivers.  Any provision of this Warrant Certificate may be amended or waived if, and only if, such amendment or
waiver is in writing and signed, in the case of an amendment, by the Holder and the Company, or in the case of a waiver, by the party against whom the waiver is to be effective. No failure or delay by either party in exercising any right, power or
privilege hereunder shall operate as a waiver thereof nor shall any single or partial exercise thereof preclude any other or further exercise thereof or the exercise of any other right, power or privilege. The rights and remedies herein provided
shall be cumulative and not exclusive of any rights or remedies provided by law. 

 
 13 

  
 IN WITNESS WHEREOF, the Company has duly caused this Warrant Certificate to be
signed by its duly authorized officer and to be dated as of [        ], 2002. 
  
 
	 DIVERSA CORPORATION
  
 
	 
	 By:
 	 	  
 

	  	 	 Name:
 Title:
 

 
  
 Acknowledged and Agreed: 
  
 
	 SYNGENTA PARTICIPATIONS AG
  
 
	 
	 By:
 	 	  
 

	  	 	 Name:
 Title:
 

 
  
 
	 
	 By:
 	 	  
 

	  	 	 Name:
 Title:
 

 

 
 14 

  
 WARRANT EXERCISE NOTICE 
  
 (To be delivered prior to exercise of the Warrant 
 by execution of the Warrant Exercise
Subscription Form) 
  

	To:
	 
	Diversa Corporation 
 

  
 The undersigned hereby notifies you of its intention to exercise the Warrant to purchase shares of Common Stock, par value $.001 per share, of Diversa Corporation. The undersigned intends to exercise the Warrant to purchase
             shares (the “Shares”) at $         per Share (the Exercise Price currently in effect pursuant to the
Warrant). The undersigned intends to pay the aggregate Exercise Price for the Shares (i) in cash, certified or official bank or bank cashier’s check (or a combination of cash and check) or (ii) pursuant to the “cash-less” exercise
mechanism described in Section 2(e) of the Warrant, as indicated below. 
  
 Date:
                 
  
 
	 

	 (Signature of Owner)
  
 
	 
(Street Address)
  
 
	 
(City)                        (State)           
             (Zip Code)
 

 
  
 Payment:        $             cash 
  
                $             check 
  
                         “cash-less” exercise pursuant to Section 2(e) of the Warrant 

  
 WARRANT EXERCISE SUBSCRIPTION FORM 
  
 (To be executed only upon exercise of the Warrant 
 after
delivery of Warrant Exercise Notice) 
  

	To:
	 
	Diversa Corporation 
 

  
 The undersigned irrevocably exercises the Warrant for the purchase of              shares (the “Shares”) of Common Stock, par value $.001 per share,
of Diversa Corporation (the “Company”) at $             per Share (the Exercise Price currently in effect pursuant to the Warrant) [and herewith makes payment
of $             (such payment being made in cash or by certified or official bank or bank cashier’s check payable to the order of the Company or by any permitted combination of
such cash or check) / pursuant to the “cash-less” exercise mechanism described in Section 2(e) of the Warrant], all on the terms and conditions specified in the within Warrant Certificate, surrenders this Warrant Certificate and all right,
title and interest therein to the Company and directs that the Shares deliverable upon the exercise of this Warrant be registered or placed in the name and at the address specified below and delivered thereto. 
  
 Date:                  
  
 
	 

	 (Signature of Owner)
  
 
	 
(Street Address)
  
 
	 
(City)                        (State)           
             (Zip Code)
 

 

  
 Securities and/or check to be issued to:                         
                                        
                                        
                                        
                                 
  

Please insert social security or identifying number:                       
                                        
                                        
                                        
             
  
 Name:                                    
                                        
                                        
                                        
                                        
                                        
   
  
 Street Address:                                  
                                        
                                        
                                        
                                        
                             
  
 City, State and Zip Code:                              
                                        
                                        
                                        
                                        
              
  
 Any unexercised portion of the Warrant evidenced by the
within Warrant 
 Certificate to be issued to: 
  
 Please insert social security or identifying number:                       
                                        
                                        
                                        
             
  
 Name:                                    
                                        
                                        
                                        
                                        
                                        
   
  
 Street Address:                                  
                                        
                                        
                                        
                                        
                             
  
 City, State and Zip Code:                              
                                        
                                        
                                        
                                        
              

  
 WARRANT ASSIGNMENT FORM 
  
 Dated                     ,
             
  
 FOR VALUE RECEIVED,
                             hereby sells, assigns and transfers unto
                                        
                     (the 
 (please type or print in block
letters)           
 “Assignee”), 
  
                                      
                                        
                                        
                                        
                                        
                                        
                     
 (insert address) 

 
 this Warrant for up to [            ] shares of Common Stock and does hereby irrevocably
constitute and appoint                                      
Attorney, to transfer the same on the books of the Company, with full power of substitution in the premises. 
  
 Signature:

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