CHIRON CORP
EXHIBIT 10.517
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<DESCRIPTION>EXHIBIT 10.517
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<P ALIGN="RIGHT"><FONT SIZE=2><A
NAME="kk1287_exhibit_10.517"> </A>
<A NAME="toc_kk1287_1"> </A>
<BR></FONT><FONT SIZE=2><B>Exhibit 10.517    <BR>    </B></FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2><A
NAME="kk1287_chiron_corporation_supp__kk102475"> </A>
<A NAME="toc_kk1287_2"> </A>
<BR></FONT><FONT SIZE=2><B>CHIRON CORPORATION<BR>  SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN    <BR>    </B></FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2><B>(As Amended and Restated Effective March&nbsp;1, 2003)  </B></FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2><A
NAME="kk1287_article_i_purpose"> </A>
<A NAME="toc_kk1287_3"> </A>
<BR></FONT><FONT SIZE=2><B>ARTICLE I<BR>  PURPOSE    <BR>    </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This Plan is designed to restore to selected employees of Chiron Corporation and its affiliates certain benefits that cannot be provided under the Chiron 401(k)
Plan. It shall be effective for compensation earned after December&nbsp;31, 1997 and to permit additional deferrals of annual bonuses. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This
Plan is intended to be a plan that is unfunded and that is maintained by Chiron Corporation primarily for the purpose of providing deferred compensation for a select group of
management or highly compensated employees within the meaning of the Employee Retirement Income Security Act of 1974 ("ERISA"). </FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2><A
NAME="kk1287_article_ii_definitions"> </A>
<A NAME="toc_kk1287_4"> </A>
<BR></FONT><FONT SIZE=2><B>ARTICLE II<BR>  DEFINITIONS    <BR>    </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;In this Plan, the following terms have the meanings indicated below: </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.01</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;"Account"</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;means a bookkeeping entry used to record supplemental deferrals and contributions made on a
Participant's behalf under Article&nbsp;III and Article&nbsp;VII of the Plan and any earnings credited to these supplemental deferrals and contributions under Article&nbsp;IV or
Article&nbsp;VII of the Plan. To the extent it considers necessary or appropriate, the Committee or its delegate shall maintain separate a subaccount for each type of supplemental deferral or
contribution under the Plan or shall otherwise provide a means for determining that portion of an account attributable to each type. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.02</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;"Affiliate"</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;means an entity other than the Company whose employees participate in the 401(k) Plan. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.03</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;"Beneficiary"</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;means the person or persons, natural or otherwise, entitled to receive a Participant's vested
Account if the Participant dies before distribution of his or her entire vested Account. A Participant's Beneficiary shall, at any time, be the person or persons then designated, whether affirmatively
or by default, as the Participant's beneficiary under the 401(k) Plan. If the Participant no longer has a beneficiary under the 401(k) plan, the Participant may designate one or more primary
Beneficiaries and one or more secondary Beneficiaries for purposes of this Plan. Any such designation will be made in writing pursuant to such procedures as the Committee may establish and delivered
to the Committee before the Participant's death. The Participant may revoke or change this designation at any time before his or her death by following such procedures as the Committee may establish.
If there is no effective Beneficiary designation on file when such a Participant dies, the Participant's vested Account will be distributed to the Participant's spouse if surviving at the
Participant's death, or if there is no such spouse, the Participant's estate. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.04</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;"Bonus"</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;means the component of an Eligible Employee's Compensation paid in the form of an annual cash
bonus. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.05</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;"Chiron 401(k) Plan"</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;means the Chiron Corporation 401(k) Plan, as amended from time to time. </FONT></P>


<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.06</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;"Code"</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;means the Internal Revenue Code of 1986, as amended. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.07</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;"Committee"</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;means the committee established pursuant to Article&nbsp;XIV of the Chiron 401
(k)&nbsp;Plan, as constituted from time to time. The Committee has full discretionary authority to administer </FONT></P>

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<P><FONT SIZE=2>and
interpret the Plan, to determine eligibility for Plan benefits, to select employees for Plan participation, and to correct errors. The Committee may delegate its duties and responsibilities and,
unless the Committee expressly provides to the contrary, any such delegation will carry with it the Committee's full discretionary authority to accomplish the delegation. Decisions of the Committee
and its delegate will be final and binding on all persons. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.08</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;"Company"</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;means Chiron Corporation. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.09</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;"Compensation"</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;means compensation as established pursuant to Article&nbsp;II of the Chiron 401
(k)&nbsp;Plan, as constituted from time to time. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.10</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;"Eligible Employee"</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;means an employee of the Company or of an Affiliate at the level of any executive
salary grade position who has been selected by the Committee for Plan participation. An individual will automatically cease to be an Eligible Employee on the earliest of (i)&nbsp;the date the
individual ceases to be an employee of the Company or an Affiliate at the level of an executive salary grade position, (ii)&nbsp;the date specified by the Committee for such cessation or
(iii)&nbsp;the date the Plan is terminated. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.11</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;"Matching Contribution"</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;means a matching contribution pursuant to Section&nbsp;5.02 of the Chiron 401(k)
Plan. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.12</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;"Participant"</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;means a current or former Eligible Employee who retains an Account. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.13</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;"Plan"</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;means this Chiron Corporation Supplemental Executive Retirement Plan, as amended from time to time. </FONT></P>


<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.14</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;"Plan Year"</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;means the plan year defined in the Chiron 401 (k)&nbsp;Plan. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.15</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;"Plan Year Account"</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;means, for each Plan Year, that portion of an Eligible Employee's Account that is
attributable to (i)&nbsp;Compensation that would have been paid in such Plan Year had payment not been deferred under this Plan and (ii)&nbsp;interest credited thereto pursuant to
Article&nbsp;IV. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.16</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;"Retirement Contribution"</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;means a retirement contribution pursuant to Section&nbsp;5.03 of the Chiron
401(k) Plan. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.17</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;"Salary Deferral"</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;means a salary deferral pursuant to Section&nbsp;5.01 of the Chiron 401(k) Plan. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.18</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;"Special Deferred Compensation Arrangement"</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;means any written deferred compensation arrangement entered
into between and signed by an Eligible Employee and the Company, or an Affiliate thereof, which is approved by the Committee or its delegate pursuant to Section&nbsp;7.01 hereof. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.19</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;"Termination of Employment"</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;means termination of employment with the Company and all Affiliates, other than
by reason of death. </FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2><A
NAME="kk1287_article_iii_deferrals_and_contributions"> </A>
<A NAME="toc_kk1287_5"> </A>
<BR></FONT><FONT SIZE=2><B>ARTICLE III<BR>  DEFERRALS AND CONTRIBUTIONS    <BR>    </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3.01</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;Supplemental Salary Deferrals.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;</FONT></P>

<UL>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a)</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;Elections.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;In order to be eligible for supplemental salary deferrals for each Plan Year, an Eligible
Employee must make an election to make Salary Deferrals for such Plan Year. Such election generally must be made before the calendar year in which the Compensation is earned, in accordance with such
procedures as the Committee shall specify. However, if an individual first becomes an Eligible Employee during a Plan Year, an Eligible Employee may elect, within 30&nbsp;days after he or she is
first notified that he or she is eligible to participate in the Plan, to defer Compensation for services performed during that Plan Year and after the election. Elections will remain in effect for one
Plan Year or, if the Committee so permits, all subsequent Plan Years </FONT></P>

</UL>
<P ALIGN="CENTER"><FONT SIZE=2>2</FONT></P>

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<UL>

<P><FONT SIZE=2>during
which the individual remains an Eligible Employee. Such election may be revoked, but any revocation cannot be made effective before the first day of the first Plan year beginning after the date
the revocation is filed. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b)</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;Late Election.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;If an Eligible Employee does not make a timely election for a Plan Year, no supplemental
salary deferral will be made under the Plan on behalf of that Eligible Employee with regard to that election for that Plan Year. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(c)</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;Amount.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;The amount of an Eligible Employee's supplemental salary deferral will be equal to the portion of
the Salary Deferral otherwise elected by such Eligible Employee which could not be contributed to the Chiron 401(k) Plan due to the limitations of Code Sections&nbsp;401(a)(17), 402(g)(1)
and/or&nbsp;415. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(d)</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;Special Election for Bonuses.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;For Plan Years beginning after December&nbsp;31, 2001, an Eligible Employee
may make a separate salary deferral election with respect to the Eligible Employee's Bonus that will be paid in such Plan Year. The portion of the Bonus that may be deferred pursuant to this election
is any percentage that, when added to the maximum percentage of Salary Deferral that he may elect, does not exceed one hundred percent (100%) of such Bonus. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(e)</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;Crediting.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;Supplemental salary deferrals will be credited to Eligible Employees' Accounts as of the date
that the Salary Deferrals to which the supplemental salary deferrals relate would otherwise have been credited to the Chiron 401 (k)&nbsp;Plan. </FONT></P>

</UL>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3.02</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;Supplemental Matching Contributions.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;</FONT></P>

<UL>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a)</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;Amount.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;The amount of an Eligible Employee's supplemental matching contribution for a Plan Year will be
equal to the amount by which that Eligible Employee's Matching Contribution for that Plan Year was reduced due to the reduction of such Eligible Employee's Salary Deferral or Matching Contributions as
a result of the Code Sections 401(a)(17), 402(g)(1) and/or 415; provided that supplemental matching contributions attributable to Salary Deferral reductions under the Chiron 401(k)
Plan shall not be made unless supplemental salary deferrals equal to such reductions are made hereunder. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b)</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;Crediting.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;Supplemental Matching Contributions will be credited to Eligible Employees' Accounts as of the
date that the Matching Contributions to which the Supplemental Matching Contributions relate would otherwise have been credited to the Chiron 401&nbsp;(k)&nbsp;Plan. </FONT></P>

</UL>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3.03</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;Supplemental Retirement Contributions.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;</FONT></P>

<UL>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a)</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;Amount.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;The amount of an Eligible Employee's supplemental retirement contribution for a Plan Year will be
equal to the amount by which that Eligible Employee's Retirement Contribution for that Plan Year was reduced as a result of Code Sections 401(a)(17) and/or&nbsp;415. </FONT></P>


<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b)</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;Crediting.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;Supplemental retirement contributions will be credited to Eligible Employees' Accounts as of the
date that the Retirement Contributions to which such Supplemental Retirement Contributions relate would otherwise have been credited to the Chiron 401(k) Plan. </FONT></P>

</UL>
<P ALIGN="CENTER"><FONT SIZE=2><A
NAME="kk1287_article_iv_earnings"> </A>
<A NAME="toc_kk1287_6"> </A>
<BR></FONT><FONT SIZE=2><B>ARTICLE IV<BR>  EARNINGS    <BR>    </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Interest will be credited to each Account at the end of each calendar quarter, in accordance with procedures approved by the Committee. The interest rate used
will be based on the Moody's Corporate Bond Yield Average. The Corporate Bond Yield Average is equal to the average of the Moody's Corporate AAA, AA, A and BAA Bond Yield Averages, determined as of
the first business day of that quarter. The first quarter for which interest will be credited is the calendar quarter beginning January&nbsp;1, 1998. </FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2>3</FONT></P>

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<P ALIGN="CENTER"><FONT SIZE=2><A
NAME="kk1287_article_v_vesting"> </A>
<A NAME="toc_kk1287_7"> </A>
<BR></FONT><FONT SIZE=2><B>ARTICLE V<BR>  VESTING    <BR>    </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Participants will be 100% vested in that portion of their Accounts attributable to supplemental salary deferrals and supplemental matching contributions and will
vest in that portion of their Accounts
attributable to supplemental retirement contributions in the same manner that they vest in Retirement Contributions. That portion of a Participant's Account attributable to amounts deferred under a
Special Deferred Compensation Arrangement shall vest in accordance with the terms of that arrangement. </FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2><A
NAME="kk1287_article_vi_distributions"> </A>
<A NAME="toc_kk1287_8"> </A>
<BR></FONT><FONT SIZE=2><B>ARTICLE VI<BR>  DISTRIBUTIONS    <BR>    </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;6.01</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;Standard Distribution Options</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;</FONT></P>

<UL>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a)</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;General.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;Subject to Sections 6.01(b) (relating to Retirement), Section&nbsp;6.02 (relating to
distributions following death), Section&nbsp;6.03 (relating to accelerated distributions) and Article&nbsp;VII (relating to certain distributions of Special Deferred Compensation Arrangements)
each Plan Year Account of a Participant, to the extent vested, will be distributed in a lump sum within 30&nbsp;days following the </FONT><FONT SIZE=2><I>earlier </I></FONT><FONT SIZE=2>of </FONT></P>

<UL>
<DL compact>
<DT style='margin-bottom:-11pt;'><FONT SIZE=2>(i)</FONT></DT><DD><FONT SIZE=2>the
date 30&nbsp;days after the Participant's Termination of Employment or, if the Participant so elects, the January&nbsp;15 of the calendar year immediately
following the Participant's Termination of Employment or
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>(ii)</FONT></DT><DD><FONT SIZE=2>for
each Plan Year Account attributable to a Plan Year beginning after December&nbsp;31, 2001, March&nbsp;1 of any calendar year that begins at least two years
after the beginning of such Plan Year (the "Specified Payment Date"). Although a Participant may elect a separate Specified Payment Date for each Plan Year Account, the Plan Administrator may specify
a limit on the total number of different Specified Payment Dates that a Participant may elect with respect to all Plan Year Accounts. </FONT></DD></DL>
</UL>
</UL>
<UL>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b)</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;Retirement.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;An Eligible Employee may also elect that if, at the time of Termination of Employment, he or she
both (i)&nbsp;reached age fifty-five (55)&nbsp;and (ii)&nbsp;been employed by the Company for a period of at least ten (10)&nbsp;years, payment of his or her vested Account will be
distributed, in lieu of the time and form of distribution set forth in (a)&nbsp;above, beginning on a date following Termination of Employment elected by the Eligible Employee, but not later than
Participant's 65th birthday (or if later, the first March&nbsp;1 following Termination of Employment), and may be made in a single lump sum or in annual installments, not in excess of 10. The amount
of each installment will be the remaining balance of the Participant's vested Account divided by the number of installments remaining (including the installment to be made). </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(c)</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;Elections.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;Any election made by an Eligible Employee with respect to a Plan Year Account under (a)&nbsp;or
(b)&nbsp;above must be made at such time and in such manner as the Committee may specify, but not later than the deadline for electing to defer compensation otherwise payable in such Plan Year. If
the Committee so determines, an election may apply to all subsequent Plan years, until revoked in writing before the first Plan Year for which it is intended to be revoked. A Participant may change a
distribution election with respect to a Plan Year Account by submitting the change to the Committee at such time and in such manner as the Committee shall specify. However, any election eliminating or
changing a Specified Payment Date must be made at least two years before the previously Specified Payment Date and any new Specified Payment Date must be March&nbsp;1 of a calendar year that is not
earlier than the second calendar year beginning after the new election is made. Any change in the time or manner in which a Plan Account is distributed following Termination of Employment will be
valid only if Termination of Employment occurs more than two years after the date of such subsequent election. </FONT></P>

</UL>
<P ALIGN="CENTER"><FONT SIZE=2>4</FONT></P>

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<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(d)</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;Default.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;Subject to Article&nbsp;VII (relating to certain distributions of Special Deferred Compensation
Arrangements), if upon a Participant's Termination of Employment, the Committee does not have a proper distribution election on file for that Participant, the vested portion of that Participant's
Account will be distributed to the Participant in one lump sum within the period 30 to 60&nbsp;days after the Participant's Termination of Employment. </FONT></P>

</UL>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;6.02</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;Death.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;Subject to Article&nbsp;VII (relating to certain distributions of Special Deferred Compensation
Arrangements), if a Participant dies with a vested amount in his or her Account, whether or not the Participant was receiving payouts from that Account at the time of his or her death, the
Participant's Beneficiary will receive the entire vested amount in the Participant's Account within the 30&nbsp;day period beginning 30&nbsp;days after (and ending 60&nbsp;days after) the
Committee learns of the Participant's death and has verified the Beneficiary's right to payment. </FONT></P>


<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;6.03</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;Accelerated Distributions.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;Pursuant to the following restrictions, a Participant may accelerate the time
and form of distribution: </FONT></P>

<UL>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a)</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;Hardship Withdrawal.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;If a Participant has a severe financial hardship resulting from extraordinary and
unforeseen circumstances beyond the Participant's control and has no other resources that could be liquidated or otherwise accessed to relieve this hardship without such liquidation or access itself
causing a severe financial hardship, the Participant may request a hardship withdrawal. The total hardship withdrawal must be approved by the Committee, and shall be limited to the amount necessary to
meet the financial need and to satisfy the Participant's tax liability with respect to such withdrawal, and in no event may such amount exceed that portion of the Participant's Account attributable to
supplemental salary deferrals and supplemental matching contributions. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b)</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;Forfeiture.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;Absent a demonstration of immediate and heavy financial need described above in
paragraph&nbsp;(a), a Participant may elect to receive 90% of his or her entire vested Account in an early distribution at any time upon 30&nbsp;days written request, in which case the remaining
ten percent (10%) of the Participant's entire vested Account shall be permanently forfeited. </FONT></P>

</UL>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;6.04</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;Withholding.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;The Company will deduct from Plan payouts, or from other compensation payable to a Participant
or Beneficiary, amounts required by law to be withheld for taxes with respect to benefits under this Plan. The Company reserves the right to reduce any supplemental deferral or contribution that would
otherwise be made under this Plan on behalf of a Participant to satisfy the Participant's tax withholding liabilities. </FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2><A
NAME="kk1287_article_vii_special_def__kk102250"> </A>
<A NAME="toc_kk1287_9"> </A>
<BR></FONT><FONT SIZE=2><B>ARTICLE VII<BR>  SPECIAL DEFERRED COMPENSATION ARRANGEMENTS    <BR>    </B></FONT></P>


<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;7.01</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;General.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;If an Eligible Employee enters into a separate written arrangement with the Company or an
Affiliate, signed by both parties, for the payment of nonqualified deferred compensation or the Company authorizes the deferral of additional types of compensation arrangements (including but not
limited to severance payments, special bonuses, bonuses or other compensation earned with a predecessor company, etc.) pursuant to a separate written arrangement signed by the Eligible Employee and
the Company or an Affiliate (each a "Special Deferred Compensation Arrangement"), payment of such compensation shall be made through this Plan, unless expressly specified otherwise under such
arrangement. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;7.02</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;Defined Contribution Arrangements.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;If the Special Deferred Compensation Arrangement is in the nature of a
defined contribution arrangement, the deferred amount will be credited to the Eligible Employee's Account when such amounts would otherwise have been paid or when specified under the arrangement.
Amounts so credited to the Eligible Employee's Account will be credited with </FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2>5</FONT></P>

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<P><FONT SIZE=2>earnings
and, to the extent vested under the arrangement, shall become distributed in accordance with the terms of the Plan, except to the extent specified under the arrangement. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;7.03</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;Defined Benefit Arrangements.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;If a Special Deferred Compensation Arrangement is in the nature of a defined
benefit arrangement, the benefit shall be payable hereunder, at the time and in the form specified in the arrangement. </FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2><A
NAME="kk1287_article_viii_prior_ccd_plan"> </A>
<A NAME="toc_kk1287_10"> </A>
<BR></FONT><FONT SIZE=2><B>ARTICLE VIII<BR>  PRIOR CCD PLAN    <BR>    </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This Plan shall supersede and replace the Ciba Corning Diagnostics Corp. Supplemental Executive Retirement Plan (the "CCD SERP") effective January&nbsp;1, 1998,
other than with respect to Supplemental Pension Plan Benefits thereunder. As a result, no further Supplemental Investment Plan Credits shall be made under the CCD SERP with respect to compensation
earned after December&nbsp;31, 1997 and all Supplemental Investment Plan Credits (including earnings thereon as of December&nbsp;31, 1997) attributable to compensation earned by a Participant
before January&nbsp;1, 1998 shall be credited to such Participant's Account under this Plan effective January&nbsp;1, 1998 and shall be subject thereafter to this Plan's provisions, including but
not limited to this Plan's provisions relating to earnings (for periods after December&nbsp;31, 1997) and distribution. However, that portion of an Account attributable to Supplemental Investment
Plan Credits under the CCD SERF (including earnings thereon) shall vest in the same manner that the underlying qualified plan contributions (i.e. that they supplemented) vest under the 401(k) Plan. If
such an individual would not otherwise be a Participant in this Plan effective January&nbsp;1, 1998, he or she must elect no later than December&nbsp;31, 1997, in accordance with such procedures
as the Committee shall specify, the manner in which his or her vested Account will be paid out in accordance with Article&nbsp;V of this Plan. </FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2><A
NAME="kk1287_article_ix_miscellaneous"> </A>
<A NAME="toc_kk1287_11"> </A>
<BR></FONT><FONT SIZE=2><B>ARTICLE IX<BR>  MISCELLANEOUS    <BR>    </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;9.01</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;Limitation of Rights.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;Participation in this Plan does not give any individual the right to be retained in
the service of the Company or of any related entity. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;9.02</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;Satisfaction of Claims.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;Payments to a Participant, the Participant's legal representative, or Beneficiary
in accordance with the terms of this Plan will, to the extent thereof, be in full satisfaction of all claims that person may have hereunder against the Committee, the Company, and all Affiliates, any
of which may require, as a condition to payment, that the recipient execute a receipt and release in a form determined by the Committee, the Company, or an Affiliate. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;9.03</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;Indemnification.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;The Company and the Affiliates will indemnify and hold harmless the Directors, the members
of the Committee, and employees of the Company and the Affiliates who may be deemed fiduciaries of the Plan, from and against any and all liabilities, claims, costs and expenses, including attorneys'
fees, arising out of an alleged breach in the performance of their fiduciary duties under the Plan, other than such liabilities, claims, costs and expenses as may result from the gross negligence or
willful misconduct of such persons. The Company and the Affiliates shall have the right, but not the obligation, to conduct the defense of such persons in any proceeding to which this Section applies. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;9.04</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;Assignment.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;To the fullest extent permitted by law, benefits under the Plan and rights thereto are not
subject in any manner to anticipation, alienation, sale, transfer, assignment, pledge, encumbrance, attachment, or garnishment by creditors of a Participant or a Beneficiary. </FONT></P>


<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;9.05</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;Inability to Locate Recipient.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;If a benefit under the Plan remains unpaid for two years from the date it
becomes payable solely by reason of the inability of the Committee to locate the Participant or Beneficiary entitled to the payment, the benefit shall be treated as forfeited. Any amount forfeited </FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2>6</FONT></P>

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<P><FONT SIZE=2>in
this manner shall be restored without interest upon presentation of an authenticated written claim by the person entitled to the benefit. </FONT></P>


<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;9.06</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;Amendment and Termination.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;The Company's Board of Directors may, at any time, amend or terminate the Plan.
In addition, the Committee may amend the Plan (other than this Section&nbsp;9.06), provided that no such amendment may cause any substantial increase in cost to the Company or to any Affiliate. Any
amendment must be made in writing; no oral amendment will be effective. No amendment may, without the consent of an affected Participant (or, if the Participant is deceased, the Participant's
Beneficiary), adversely affect the Participant's or the Beneficiary's rights and obligations under the Plan with respect to amounts already credited to a Participant's Account. Notwithstanding the
foregoing, if the Plan is terminated, the Company's Board of Directors may determine that all Accounts will be paid out as soon as practicable thereafter in single sum payments. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;9.07</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;Applicable Law.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;To the extent not governed by Federal law, the Plan is governed by the laws of the State of
California. If any provision of the Plan is held to be invalid or unenforceable, the remaining provisions of the Plan will continue to be fully effective. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;9.08</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;No Funding.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;The Plan constitutes a mere promise by the Company and the Affiliates to make payments in the
future in accordance with the terms of the Plan. Except to the extent provided below in Section&nbsp;9.09, Participants and Beneficiaries have the status of general unsecured creditors of the
Company and the Affiliates and Plan benefits will be paid from the general assets of the Company and the Affiliates and nothing in the Plan will be construed to give any Participant or any other
person rights to any specific assets of the Company or the Affiliates. In all events, it is the intention of the Company, all Affiliates and all Participants that the Plan be treated as unfunded for
tax purposes and for purposes of Title I of ERISA. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;9.09</FONT><FONT
SIZE=2><I>&nbsp;&nbsp;&nbsp;&nbsp;Salary Deferral Trust.</I></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;Plan benefits attributable to the supplemental salary deferrals of Participants
shall be paid from the assets of a grantor trust (the "Trust") established by the Company to assist it in meeting its obligations and, to the extent that such assets are not sufficient, by the
Company. The Trust
shall conform to the terms of the Internal Revenue Service Model Trust as described in Internal Revenue Service Revenue Procedure 92-64. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;IN
WITNESS WHEREOF, Chiron Corporation has caused this Plan, as amended and restated effective March&nbsp;1, 2003 to be executed by its duly authorized representative on the date
indicated below. </FONT></P>

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<TD WIDTH="46%" ALIGN="CENTER"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD WIDTH="8%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="46%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="46%" ALIGN="CENTER"><FONT SIZE=2>/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>WILLIAM G. GREEN</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> Signature</FONT></TD>
<TD WIDTH="8%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="46%" ALIGN="CENTER"><FONT SIZE=2>March 14, 2003</FONT><HR NOSHADE><FONT SIZE=2> Date<BR></FONT>
</TD>
</TR>
</TABLE>
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<TABLE WIDTH="100%" BORDER=0 CELLSPACING=0 CELLPADDING=0>
<TR VALIGN="TOP">
<TD WIDTH="8%"><FONT SIZE=2>Name:</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="41%"><FONT SIZE=2>William G. Green</FONT></TD>
<TD WIDTH="8%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="41%"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="8%"><FONT SIZE=2>Title:</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="41%"><FONT SIZE=2>Sr. Vice President,<BR>
General Counsel &amp; Secretary<BR></FONT>
</TD>
<TD WIDTH="8%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="41%"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
</TABLE>
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<P ALIGN="CENTER"><FONT SIZE=2>7</FONT></P>

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<BR>
<P><br><A NAME="03SFO1286_5">QuickLinks</A><br></P><!-- TOC_BEGIN -->
<UL>
<FONT SIZE=2><A HREF="#toc_kk1287_1">Exhibit 10.517</A></FONT><BR>
</UL>
<FONT SIZE=2><A HREF="#toc_kk1287_2">CHIRON CORPORATION SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN</A></FONT><BR>
<FONT SIZE=2><A HREF="#toc_kk1287_3">ARTICLE I PURPOSE</A></FONT><BR>
<FONT SIZE=2><A HREF="#toc_kk1287_4">ARTICLE II DEFINITIONS</A></FONT><BR>
<FONT SIZE=2><A HREF="#toc_kk1287_5">ARTICLE III DEFERRALS AND CONTRIBUTIONS</A></FONT><BR>
<FONT SIZE=2><A HREF="#toc_kk1287_6">ARTICLE IV EARNINGS</A></FONT><BR>
<FONT SIZE=2><A HREF="#toc_kk1287_7">ARTICLE V VESTING</A></FONT><BR>
<FONT SIZE=2><A HREF="#toc_kk1287_8">ARTICLE VI DISTRIBUTIONS</A></FONT><BR>
<FONT SIZE=2><A HREF="#toc_kk1287_9">ARTICLE VII SPECIAL DEFERRED COMPENSATION ARRANGEMENTS</A></FONT><BR>
<FONT SIZE=2><A HREF="#toc_kk1287_10">ARTICLE VIII PRIOR CCD PLAN</A></FONT><BR>
<FONT SIZE=2><A HREF="#toc_kk1287_11">ARTICLE IX MISCELLANEOUS</A></FONT><BR>
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