Document:

Employment Letter Agreement between Michael J. Dunn and ACLARA BioSciences

 EXHIBIT 10.41 
  
 April 11, 2003 
  
 Mr. Michael J. Dunn 
 1829 El Camino Del Teatro 
 La Jolla, California 92037 
  
 Dear Mike: 
  
 ACLARA BioSciences,
Inc. (the “Company”) is pleased to offer you employment on the terms set forth below. 
  
 1.    Position.  You will serve in a full-time capacity as Chief Business Officer. You will report to me, the
Company’s CEO. By signing this letter agreement, you represent and warrant to the Company that you are under no contractual commitments inconsistent with your obligations to the Company. You will work principally out of the Company’s
facility in the San Francisco Bay Area, but it is understood that you will commute from San Diego and you will be entitled to work a minimum of one (1) day per week out of your home or other office in San Diego County. 
  
 2.    Salary.  You will be paid a base
salary at the annual rate of $275,000, payable in bi-weekly installments in accordance with the Company’s standard payroll practices for salaried employees. This salary will be subject to increase pursuant to the Company’s employee
compensation policies in effect from time to time. 
  
 3.    Bonus.  You will be eligible for an annual bonus of up to 35% of your base salary based on achievement of mutually agreed-upon milestones, assessed at the end of each evaluation period. 

 
 4.    Employee Benefits.  As a
regular employee of the Company, you will be eligible to participate in a number of Company-sponsored benefits. In addition, you will be entitled to paid time off in accordance with the Company’s policy, as in effect from time to time.

  
 5.    Stock
Options.  Subject to the approval of the Company’s Board of Directors, you will be granted options to purchase 375,000 shares of the Company’s Common Stock. Such options will be incentive stock options to the extent
permissible under applicable tax laws, and the balance will be nonstatutory stock options. The exercise price per share will be equal to the closing price of the Company’s Common Stock on the trading day immediately prior to the date the
options are granted, which is expected to be the date on which you commence employment with the Company. The options will generally be subject to the terms and conditions applicable to options granted under the Company’s Amended and Restated
1997 Stock Plan, as described in that Plan and the applicable stock option agreement, although the nonstatutory options may be granted outside such Plan. The options will vest over four (4) years, with twenty-five percent (25%) of the shares subject
to such options vesting on the first 

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anniversary of the date you commence your employment with the Company and one forty-eighth (1/48th) of the original number of shares vesting on each monthly anniversary of such date thereafter while you remain a service provider to the Company. Such vesting
shall be subject to acceleration as provided for in the Severance Agreement referred to in paragraph 6 below. 
  
 6.    Severance Agreement.  The Company will enter into a Severance Agreement with you substantially in the form
attached hereto as Exhibit A. This Severance Agreement will provide for certain severance payments and acceleration of vesting of all stock option grants under circumstances described in such agreement. 
  
 7.    Moving and Commuting Expenses. 

 
 (a)    The Company agrees to pay all reasonable
moving and other relocation expenses associated with selling your house in San Diego County and moving your family and household to the Bay Area, including the cost of moving personal and household effects, brokers’ commissions, expenses
associated with up to three house hunting trips for the family and a $10,000 allowance for miscellaneous items; provided, however, that the Company’s payment of any such relocation costs shall be reduced by the amount of commuting costs
reimbursed by the Company pursuant to clause (b) below relating to commuting costs incurred after the six (6) month anniversary of your commencement of employment. The Company will pay 75% of your income tax costs relating to such relocation
expenses. 
  
 (b)    In addition, the Company
agrees to pay for up to twelve (12) months of commuting costs incurred prior to completing a move. These commuting costs will cover a furnished apartment or equivalent, a computer, printer and reasonable communication gear at the employees residence
in San Diego, a local health club membership and dues in the Bay Area, one round trip airfare per week to San Diego and transportation costs to and from the airport from work or apartment in the Bay Area and home in San Diego. To the extent
permitted by applicable tax laws, these commuting costs will be covered under company business expenses and not be recorded as income to you. To the extent such commuting costs are recorded as income to you, the Company will pay 100% of your income
tax costs relating thereto. 
  
 8.    Confidential Information and Invention Assignment Agreement.  Like all Company employees, you will be required, as a condition of your employment with the Company, to sign the Company’s
standard Confidential Information and Invention Assignment Agreement. 
  
 9.    Period of Employment.  Employment with the Company is for no specific period of time. Your employment with the Company will be “at will,” meaning that either you or the Company will be
entitled to terminate your employment at any time and for any reason, with or without Cause (as defined in the Severance Agreement referred to in paragraph 6 above). Any contrary representations which may have been made to you are superseded by this
offer. This is the full and complete agreement between you and the Company on this term. The “at will” nature of your employment may only be changed in an express written agreement signed by you and a duly authorized officer of the
Company. 

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 10.    Outside Activities.  For so long as you are a full-time
Company employee, you agree that, unless the Board of Directors consents in writing otherwise, you will devote substantially all your business time and efforts to the company. For so long as you are a full-time company employee, you also will not
knowingly assist any person or organization in competing with the Company, in preparing to compete with the Company or in hiring any employees of the Company. 
  

11.    Withholding Taxes.  All forms of compensation referred to in this letter are subject to reduction to
reflect applicable withholding and payroll taxes (other than as provided for in paragraph 8). 
  
 12.    Entire Agreement.  This letter and the Exhibit attached hereto contain all of the terms of your employment with the Company and supersede any prior understandings or
agreements, whether oral or written, between you and the Company. 
  
 13.    Amendment and Governing Law.  This letter agreement may not be amended or modified except by an express written agreement signed by you and a duly authorized officer of the Company. The terms of
this letter agreement and the resolution of any disputes will be governed by California law. 
  
 14.    Start Date.  Your employment with the Company will commence on or before May 1, 2003. 
  
 We hope that you find the foregoing terms acceptable. You may indicate your agreement with these terms and accept this offer
by signing and dating the enclosed duplicate original of this letter agreement and returning it to me. This offer, if not accepted, will expire at the close of business on April 14, 2003. 
  
 As required by law, your employment with the Company is contingent upon your providing legal proof of your identity and
authorization to work in the United States. 
  
 Mike, we look
forward with enthusiasm to your acceptance of our offer and to the commencement of your duties with the Company. 
  
 If you have any questions, please call me at (858) 245-2610. 
  

	Very truly yours,
	
	ACLARA BioSciences, Inc.
		
	By:	 	 /s/  Thomas G. Klopack

	 	 	Thomas G. Klopack, CEO

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 I have read and accept this employment offer: 
  

	
	 /s/  Michael J. Dunn

	Michael J. Dunn

  
 Dated: April 11, 2003Severance Agreement between Michael J. Dunn and ACLARA BioSciences

 EXHIBIT 10.42 
  
 Exhibit A 
  
 April 11, 2003 
  
 Mr. Michael J. Dunn 
 1829 El Camino Del Teatro 
 La Jolla, California 92037 
  

	 	Re:	 	Severance Agreement 

  
 Dear Mike: 
  
 ACLARA BioSciences,
Inc. (the “Company”) considers it essential to the best interests of its shareholders to foster the continuous employment of the Company’s key management personnel. In order to induce you to remain in its employ, the Company
hereby agrees that after this letter agreement (this “Agreement”) has been fully executed, you shall receive the severance benefits set forth in this Agreement in the event of a Hostile Takeover (as defined below) or that your
employment with the Company is terminated under the circumstances described below. 
  
 1.    Term of Agreement.    This Agreement shall commence on the date hereof and shall continue in effect so long as you continue to be employed by the Company.

  
 2.    Definitions. 
  
 (a)  For purposes of this Agreement, “Board” shall
mean the Board of Directors of the Company. 
  
 (b)  For
purposes of this Agreement, “Cause” shall mean (i) gross negligence or willful misconduct in the performance of duties to the Company where such gross negligence or willful misconduct has resulted or is likely to result in
substantial and material damage to the Company or its subsidiaries; (ii) repeated unexplained or unjustified absence from the Company; (iii) a material and willful violation of any federal or state law which results or is likely to result in
substantial and material harm to the company or its standing and reputation; (iv) commission of any act of fraud with respect to the Company; or (v) conviction of a felony or a crime involving moral turpitude causing material harm to the standing
and reputation of the Company, in each case as determined in good faith by the Board. 
  
 (c)  For purposes of this Agreement, a “Change in Control” shall mean (i) an acquisition of any voting securities of the Company (the “Voting Securities”) by any
“person” (as the term “person” is used for purposes of Section 13(d) or Section 14(d) of the Securities Exchange Act of 1934, as amended (the “1934 Act”)) immediately after which such person has
“beneficial ownership” (within the meaning of Rule 13d-3 promulgated under the 1934 Act) (“Beneficial Ownership”) of 15% or more of the combined voting power of the Company’s then outstanding Voting Securities without
the approval of the Board; (ii) a merger or consolidation 

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that results in more than 50% of the combined voting power of the Company’s then outstanding Voting Securities of the Company or its successor changing
ownership (whether or not approved by the Board); (iii) the sale of all or substantially all of the Company’s assets; (iv) approval by the shareholders of the Company of a plan of dissolution or complete liquidation of the Company; or (v) the
individuals constituting the Board as of the date of this Agreement (the “Incumbent Board”) cease for any reason to constitute at least 1⁄2 of the members of the Board; provided, however, that if the election, or
nomination for election by the Company’s stockholders, of any new director was approved by a vote of the Incumbent Board, such new director shall be considered a member of the Incumbent Board. 
  
 (d)  For purposes of this Agreement, “Date of
Termination” shall mean (i) if your employment is terminated due to your death or Disability, the date of your death or Disability; or (ii) if your employment is terminated for any reason other than death or Disability, the date specified
in the Notice of Termination. 
  
 (e)  For purposes of
this Agreement, “Disability” shall mean that you have been unable to perform your duties to the Company as described in your offer letter of even date herewith, as the same may be amended from time to time, as a result of your
mental or physical incapacity and such inability, at least twenty-six (26) weeks after its commencement, is determined to be total and permanent by a physician selected by the Company and acceptable to you or your legal representative (such
agreement as to acceptability not to be unreasonably withheld). Termination resulting from Disability may only be effected after at least thirty (30) days’ written notice by the Company of its intention to termination your employment as a
result of your Disability. In the event that you resume the performance of substantially all of your duties before the termination of your employment becomes effective, the notice of intent to terminate automatically shall be deemed to have been
revoked. 
  
 (f)  For purposes of this Agreement,
“Good Reason” shall mean the occurrence of any one or more of the following events without your prior written consent, unless the Company fully corrects the circumstances constituting Good Reason (provided such circumstances are
capable of correction) prior to the Date of Termination: 
  
 (i)  any material reduction of your duties or level of responsibility or the level of management to which you report (provided, however, that any such changes occurring as a result of the hiring of a President and/or
a Chief Operating Officer by the Company shall not be deemed to constitute Good Reason for purposes of this Agreement; 
  
 (ii)  any reduction of your base compensation; 
  
 (iii)  in the event that you have personally relocated to the Bay Area, the relocation of the Company’s offices at which you are
principally employed to a location more than 35 miles from such offices; or 
  
 (iv)  in the event that you are still resident in Southern California, the relocation of the Company’s offices at which you are principally employed to a location outside the State of California.

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 Your continued employment shall not constitute consent to, or a waiver of rights with respect to, any
circumstance constituting Good Reason hereunder. 
  
 (g)  For purposes of this Agreement, a “Hostile Takeover” means a transaction or series of transactions that results in any person acquiring Beneficial Ownership of more than 50% of the combined voting power of
the Company’s then outstanding Voting Securities without the approval of the Board. 
  
 (h)  For purposes of this Agreement, “Notice of Termination” shall mean a notice that shall indicate the specific termination provision in this Agreement (if any) relied upon and shall set
forth in reasonable detail the facts and circumstances claimed to provide a basis for termination of your employment under the provision so indicated. Any purported termination of your employment by the Company or by you (other than termination due
to your death, which shall terminate your employment automatically) shall be communicated by a written Notice of Termination to the other party hereto in accordance with Section 7. 
  
 (i)  For purposes of this Agreement, a “Payment Termination” shall mean (i) the termination of
your employment by the Company without Cause or (ii) your voluntary termination of employment for Good Reason or (iii) your death or Disability. 
  
 3.    Accelerated Vesting Upon A Hostile Takeover.    Upon a Hostile Takeover during the term of this
Agreement, you shall immediately become 100% vested with respect to any options to purchase the Company’s capital stock that you then hold and/or any restrictions with respect to restricted shares of the Company’s capital stock that you
then hold shall immediately lapse. 
  
 4.    Compensation Upon Termination Not in Connection with Change in Control. 
  
 (a)  If your employment with the Company is terminated other than in a Payment Termination, the Company shall pay you your full earned but
unpaid base salary, when due, through the Date of Termination plus all other amounts to which you are entitled under any compensation plan or practice of the Company at the time such payments are due, and the Company shall have no further
obligations to you under this Agreement. 
  
 (b)  Except
as provided for in paragraph 5(c), if you incur a Payment Termination more than three (3) months prior to or more than twelve (12) months following a Change in Control, then, in lieu of any severance benefits to which you may otherwise be entitled
under any severance plan or program of the Company, you shall be entitled to the benefits provided below: 
  
 (i)  the Company shall, at the time specified in Section 4(c), pay to you your full earned but unpaid base salary, when due, through the Date of
Termination plus all other amounts to which you are entitled under any compensation plan or practice of the Company at the time such payments are due; 

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 (ii)  you shall be entitled to receive, at the times specified in Section 4(c), severance pay
in an amount equal to the sum of 
  
 (A)  your annual
base salary as in effect immediately prior to delivery of the Notice of Termination, plus 
  
 (B)  your targeted annual bonus for the year in which the Date of Termination occurs assuming that the bonus targets are satisfied; 
  
 (iii)  the Company shall provide you with outplacement services in an amount not to exceed $15,000; 
  
 (iv)  for the period beginning on the Date of Termination and
ending on the date which is 12 full months following the Date of Termination, the Company shall pay for and provide you and your dependents with the same medical benefits and life insurance coverage to which you would have been entitled had you
remained continuously employed by the Company during such period. At the termination of the benefits coverage under the first sentence of this Section 4(b)(iv), you and your dependents shall be entitled to continuation coverage pursuant to Section
4980B of the Internal Revenue Code of 1986, as amended (the “Code”), Sections 601-608 of the Employee Retirement Income Security Act of 1974, as amended, and under any other applicable law, to the extent required by such laws, as if you
had terminated employment with the Company on the date such benefits coverage terminates; and 
  
 (v)  the vesting of any options to purchase the Company’s capital stock that you then hold and/or any restrictions with respect to restricted shares of the Company’s capital stock that you then
hold shall be accelerated to the extent such options and/or restrictions would have vested or lapsed had you remained continuously employed by the Company for a period of one year following such Payment Termination. 
  
 (c)  The payments provided for in Sections 4(b)(i) and (ii) shall
be paid in a lump sum within five (5) days of the Date of Termination. 
  
 5.    Termination in Connection with Change in Control. 
  
 (a)  In the event a Payment Termination occurs within the period beginning three (3) months prior to and ending twelve (12) months following a Change in Control, then, in lieu of any severance benefits to
which you may otherwise be entitled under any severance plan or program of the Company, you shall be entitled to the benefits provided below: 
  
 (i)  the Company shall, at the time specified in Section 5(b), pay to you your full earned but unpaid base salary, when due, through the Date of
Termination at the rate in effect at the time Notice of Termination is given, plus all other amounts to which you are entitled under any compensation plan or practice of the Company at the time such payments are due; 
  
 (ii)  you shall be entitled to receive, at the times specified in
Section 5(b), severance pay in an amount equal to the sum of 

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 (A)  the greater of (x) your annual base salary as in effect immediately prior to delivery of
the Notice of Termination or (y) your annual base salary as in effective immediately prior to the Change in Control, plus 
  
 (B)  the greater of (x) your targeted annual bonus for the year in which the Date of Termination occurs or (y) your targeted annual bonus for
the year in which the Change in Control occurs, in each case assuming that the bonus targets are satisfied; and 
  
 (iii)  the Company shall provide you with outplacement services in an amount not to exceed $15,000; 
  
 (iv)  for the period beginning on the Date of Termination and
ending on the date which is 12 full months following the Date of Termination, the Company shall pay for and provide you and your dependents with the same medical benefits and life insurance coverage to which you would have been entitled had you
remained continuously employed by the Company during such period. At the termination of the benefits coverage under the first sentence of this Section 5(a)(iv), you and your dependents shall be entitled to continuation coverage pursuant to Section
4980B of the Internal Revenue Code of 1986, as amended (the “Code”), Sections 601-608 of the Employee Retirement Income Security Act of 1974, as amended, and under any other applicable law, to the extent required by such laws, as if
you had terminated employment with the Company on the date such benefits coverage terminates; and 
  
 (v)  you shall immediately become 100% vested with respect to any options to purchase the Company’s capital stock that you then hold and/or
any restrictions with respect to restricted shares of the Company’s capital stock that you then hold shall immediately lapse. 
  
 (b)  The payments provided for in Sections 5(a)(i) and (ii) shall be paid in a lump sum within five (5) days of the Date of Termination.

  
 (c)  In the event of a Change in Control, if the
Company requests that you remain employed by the Company following the Change in Control upon written notice to you within twenty (20) days following such Change in Control, you agree to do so for a period of time to be mutually determined by the
Company in consultation with you but not to exceed six (6) months (the “Transition Period”). During the Transition Period you shall continue in the Company’s employment as a senior executive for the purpose of facilitating the
transition of the Company to new management. During the Transition Period, the Company shall continue to pay your compensation at the rate in effect at the time of the Change in Control. The benefits payable pursuant to Section 5(a) above shall not
be paid until the completion of the Transition Period, if any. At the end of the Transition Period, you shall be entitled to the benefits described in Section 5(a) above; provided, however, that any accelerated vesting to which you are
entitled pursuant to Section 5(a)(v) shall be effective immediately upon the commencement of the Transition Period. In the event of a Payment Termination during the Transition Period, you shall be entitled to the benefits described in Section 5(a)
above; provided, however, that your acceptance of a reduced or different role with the Company during the Transition Period shall not alone constitute “Good Reason.” If the Company requests that you remain employed by the

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Company during the Transition Period, Section 6 of this Agreement shall not apply until the termination of the Transition Period. 
  
 (d)  For the period beginning three (3) months prior to and ending
twelve (12) months following a Change of Control, in the event of a Payment Termination, benefits shall be payable to you only pursuant to this Section 5 and you shall not be entitled to any benefits pursuant to Section 4. 
  
 6.     Post-Termination
Consulting.    In the event you resign (other than for Good Reason, in which case this Section 6 shall not apply and you shall be entitled to the benefits set forth in Section 4(b) or Section 5(a), as applicable) at any time
after one (1) year following commencement of your employment with the Company, you may elect upon written notice to the Company within ten (10) days following such resignation, or, if you do not so elect, the Company may elect upon written notice to
you within twenty (20) days following such resignation to require you, to consult for the Company for up to two (2) days per week for a six (6) month period following such resignation, during normal business hours, upon reasonable advance notice
from the Company and, to the extent requested by the Company, on site at the Company’s facilities in the San Francisco Bay Area. In the event of such an election, during such six (6) month period, you will consult on such transitional matters
as are reasonably requested by the Company, you will be paid a consulting fee of your base salary prorated per days worked per week (paid on regular company pay days, subject to normal withholdings), the provisions of paragraph 7(b) of your offer
letter of even date herewith between you and the Company will remain in effect and you will not knowingly assist any person or organization in competing with the Company, in preparing to compete with the Company or in hiring any employees of the
Company. Such consulting arrangement may be terminated at any time by either you or the Company, but if the Company terminates such arrangement without Cause or you terminate for Good Reason, the Company will pay you in a lump sum on the date of
such termination the remaining amount of the consulting fee you would have earned had you continued such arrangement for the entire six (6) month period working at a rate of two (2) days per week; provided, however, that your
acceptance of a reduced or different role with the Company during the consulting period and the Company’s requirement that you work at the Company’s facilities in the San Francisco Bay Area during the consulting period shall not alone
constitute “Good Reason.” 
  
 7.    Successors; Binding Agreement. 
  
 (a)  The Company shall require any successor (whether direct or indirect, by purchase, merger, consolidation or otherwise) to all or substantially all of the business and/or assets of the Company to
expressly assume and agree to perform this Agreement in the same manner and to the same extent that the Company would be required to perform it if no such succession had taken place. Unless expressly provided otherwise, “Company” as
used herein shall mean the Company as defined in this Agreement and any successor to its business and/or assets as aforesaid. 
  
 (b)  This Agreement shall inure to the benefit of and be enforceable by you and your personal or legal representatives, executors,
administrators, successors, heirs, distributees, devisees and legatees. If you should die while any amount would still be payable to 

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you hereunder had you continued to live, all such amounts, unless otherwise provided herein, shall be paid in accordance with the terms of this Agreement to
your devisee, legatee or other designee or, if there is no such designee, to your estate. 
  
 (c)  You shall not be required to mitigate the amount of any payment provided for in this Agreement by seeking other employment or otherwise, nor shall the amount of any payment or benefit provided for in
this Agreement be reduced by any compensation earned by you as the result of employment by another employer or self-employment, by retirement benefits, by offset against any amounts (other than loans or advances to you by the Company) claimed to be
owed by you to the Company, or otherwise. 
  
 8.    Notice.    For purposes of this Agreement, notices and all other communications provided for in this Agreement shall be in writing and shall be deemed to have been duly given when
delivered or mailed by United States certified or registered mail, return receipt requested, postage prepaid, addressed to the respective addresses set forth on the first page of this Agreement, provided that all notices to the Company shall be
directed to the attention of its Secretary, or to such other address as either party may have furnished to the other in writing in accordance herewith, except that notice of change of address shall be effective only upon receipt. 
  
 9.    Parachute
Payments.    Notwithstanding anything contained in this Agreement to the contrary, in the event that the benefits provided for in this Agreement to you together with all other payments and the value of any benefit received or
to be received by you: 
  
 (a)  constitute
“parachute payments” within the meaning of Section 280G of the Code, and 
  
 (b)  but for this Section, would be subject to the excise tax imposed by Section 4999 of the Code, then your benefits pursuant to the terms of this Agreement shall be payable either: 
  
 (i)  in full, or 
  
 (ii)  as to such lesser amount which would result in no portion of
such benefits being subject to excise tax under Section 4999 of the Code, whichever of the foregoing amounts, taking into account the applicable federal, state and local income taxes and the excise tax imposed by Section 4999, results in the receipt
by you on an after-tax basis, of the greatest amount of benefits under this Agreement, notwithstanding that all or some portion of such benefits may be subject to the excise tax imposed under Section 4999 of the Code. Unless the Company and you
otherwise agree in writing, any determination required under this Section 9 shall be made in writing by the Company’s independent public accountants serving immediately before the Hostile Takeover or Change in Control (the
“Accountants”), whose determination shall be conclusive and binding upon you and the Company for all purposes. For purposes of making the calculations required by this Section 9, the Accountants may make reasonable assumptions and
approximations concerning applicable taxes and may rely on reasonable, good faith interpretations concerning the application of Sections 280G and 4999 of the Code. The Company shall cause the Accountants to provide detailed supporting calculations
of its 

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determinations to you and the Company. You and the Company shall furnish to the Accountants such information and documents as the Accountants may reasonably
request in order to make a determination under this Section. The Company shall bear all costs the Accountants may reasonably incur in connection with any calculations contemplated by this Section 9. 
  
 10.    Miscellaneous.    No
provision of this Agreement may be modified, waived or discharged unless such waiver, modification or discharge is agreed to in writing and signed by you and such officer as may be specifically designated by the Board. No waiver by either party
hereto at any time of any breach by the other party hereto of or compliance with, any condition or provision of this Agreement to be performed by such other party shall be deemed a waiver of similar or dissimilar provisions or conditions at the same
or at any prior or subsequent time. No agreements or representations, oral or otherwise, express or implied, with respect to the subject matter hereof have been made by either party which are not expressly set forth in this Agreement. The validity,
interpretation, construction and performance of this Agreement shall be governed by the laws of the State of California without regard to its conflicts of law principles. All references to sections of the 1934 Act or the Code shall be deemed also to
refer to any successor provisions to such sections. Any payments provided for hereunder shall be paid net of any applicable withholding required under federal, state or local law. The obligations of the Company under Sections 4, 5 and 6 shall
survive the expiration of this Agreement. The section headings contained in this Agreement are for convenience only, and shall not affect the interpretation of this Agreement. 
  
 11.    Severability.    The invalidity or unenforceability of any provision
of this Agreement shall not affect the validity or enforceability of any other provision of this Agreement, which shall remain in full force and effect. 
  
 12.    Counterparts.    This Agreement may be executed in several counterparts, each of which shall be
deemed to be an original but all of which together shall constitute one and the same instrument. 
  
 13.    Entire Agreement.    This Agreement and the offer letter between you and the Company of even date
herewith set forth the entire agreement of the parties hereto in respect of the subject matter contained herein and supersedes all prior agreements, promises, covenants, arrangements, communications, representations or warranties, whether oral or
written, by any officer, employee or representative of any party hereto, and any prior agreement of the parties hereto in respect of the subject matter contained herein, including, without limitation, any prior severance or change in control
agreements, is hereby terminated and cancelled. Any of your rights hereunder shall be in addition to any rights you may otherwise have under benefit plans or agreements of the Company (other than severance plans or agreements) to which you are a
party or in which you are a participant, including, but not limited to, any Company sponsored employee benefit plans and stock options plans. The provisions of this Agreement shall not in any way abrogate your rights under such other plans and
agreements. 
  
 14.    At-Will
Employment.    Nothing contained in this Agreement shall (a) confer upon you any right to continue in the employ of the Company, (b) constitute any contract or agreement of employment, or (c) interfere in any way with the
at-will nature of your employment with the Company. 

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 If this letter sets forth our agreement on the subject matter hereof, kindly sign and return to the
Company the enclosed copy of this letter, which shall then constitute our agreement on this subject. 
  

	Sincerely,
	
	ACLARA BIOSCIENCES, INC.
	
	 /s/  Thomas G. Klopack

	By:	 	Thomas G. Klopack, CEO

  
 Agreed and Accepted, 

this 11th day of April, 2003. 
  

	
	 /s/  Michael J. Dunn

	Michael J. Dunn

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