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Exhibit 10.519    
    

As
Amended and Approved September 9, 2004 

 
 

CHIRON CORPORATION
  CORPORATE GOVERNANCE GUIDELINES    
    

 
  INTRODUCTION    
    

        The Board of Directors of Chiron Corporation ("Chiron") is elected by the stockholders of Chiron to serve their interests through oversight of management and
Chiron's business. The primary responsibility of the directors is to exercise their business judgment in the best interests of Chiron and its stockholders. The Board, acting on the recommendation of
its Nominating and Corporate Governance Committee, has developed and adopted these corporate governance principles (the "Guidelines") to promote the functioning of the Board and its committees, to
promote the interests of stockholders and to set forth a common set of expectations as to how the Board, its various committees and individual directors should perform their functions. Chiron is party
to a Governance Agreement, dated as of November 20, 1994, with Novartis AG ("Novartis"), as amended (as it may be further amended from time to time, the "Governance Agreement") and these
guidelines have been developed in light of, among other things, that agreement. 

 
 

BOARD COMPOSITION    
    

	•
	The
composition of the Board should balance the following goals:

	•
	The
size of the Board should facilitate substantive discussions of the whole Board in which each director can participate meaningfully;

	•
	The
composition of the Board should encompass a broad range of skills, expertise, industry knowledge, diversity of opinion and contacts relevant to Chiron's business;

	•
	The
composition of the Board shall reflect the requirements of the Governance Agreement;

	•
	A
substantial majority of the Board shall consist of directors who are neither officers or employees of Chiron or its subsidiaries nor have a relationship which, in the
opinion of the Board, would interfere with the exercise of independent judgment in carrying out the responsibilities of a director, and who are otherwise "independent" under the rules of the Nasdaq
Stock Market, Inc. 

 
 

SELECTION OF CHAIRPERSON OF THE BOARD AND
  CHIEF EXECUTIVE OFFICER    
    

        The Board is free to select its Chairperson and Chiron's Chief Executive Officer (the "CEO") in the manner it considers in the best interests of Chiron at any
given point in time. These positions may be filled by one individual or by two different individuals. 

 
 

SELECTION OF DIRECTORS    
    

        Nominations.    Subject to the Governance Agreement and the right of Novartis to designate a specific number of the members of
the Board pursuant thereto, the Nominating and Corporate Governance Committee is responsible for determining the slate of director nominees for election to Chiron's Board of Directors and the
individuals to fill vacancies occurring between annual meetings of stockholders. 

 

        Criteria.    The Nominating and Corporate Governance Committee shall determine new nominees for the position of independent
director who satisfy the requirements of the Nasdaq Stock Market, Inc., the Governance Agreement and the following criteria: 

	•
	Personal
qualities and characteristics, accomplishments and reputation in the business community;

	•
	Current
knowledge and contacts in the communities in which Chiron does business and in Chiron's industry or other industries relevant to Chiron's business;

	•
	Ability
and willingness to commit adequate time to Board and committee matters;

	•
	The
fit of the individual's skills and personality with those of other directors and potential directors in building a Board that is effective, collegial and responsive to
the needs of Chiron; and

	•
	Diversity
of viewpoints, background, experience and other factors. 

        Invitation.    The invitation to join the Board should be extended by the Board itself via the Chairperson of the Board and CEO
of Chiron, together with an independent director, when deemed appropriate. 

        Orientation and Continuing Education.    Management, working with the Board, will provide an orientation process for new
directors, including background material on Chiron, its business plan and its risk profile, and meetings with senior management. Periodically, management should prepare additional educational sessions
for directors on matters relevant to Chiron, its business plan and risk profile. 

 
 

ELECTION TERM    
    

        The Board does not believe it should establish term limits. 

 
 

RETIREMENT OF DIRECTORS    
    

        The Board does not believe it should establish a mandatory retirement age. In determining the slate of director nominees to stand for election or in filling any
vacancy, the Nominating and Corporate Governance Committee will consider the age of each nominee among all other relevant factors. 

 
 

PRESIDING DIRECTOR    
    

        The Board, acting upon management's recommendation, believes that in situations where a single individual serves as the CEO and Chairperson of the Board, it would
be most appropriate to appoint a presiding director ("Presiding Director"). In such circumstances, the Presiding Director position reinforces the appropriate balance of power between the
CEO/Chairperson of the Board and the independent directors. The role of the Presiding Director supports the ability of the independent directors to perform their oversight responsibilities and
furthers the perception that that the Board acts independently of management. The scope of authority and responsibilities of the Presiding Director should be determined by what is needed to achieve
the twin goals of: (a) furthering strong, independent Board leadership generally, and (b) enabling the independent directors to perform their specific role as independent directors at a
high level. 

        The
Presiding Director should be responsible for the following tasks and should be empowered as necessary to perform them: 

	•
	Facilitate
and coordinate, as deemed appropriate by the Presiding Director, those Board of Director processes for effective oversight of the Company's performance that
require, or are best effected through, oversight by independent directors, including evaluation of governance by and performance of the Chairman and Chief Executive Officer, to the extent not
otherwise within the charter of the Compensation Committee, the Nominating and Corporate Governance Committee or another committee comprised of independent directors. 

2

 

	•
	Facilitate
provision of appropriate resources and support for all work and analysis which independent directors are required to perform (or which are best done by them);

	•
	Establish
and regularly evaluate processes to support the work of the independent directors;

	•
	Determine
the agenda for meetings of the independent directors, chair all such meetings and cause adequate materials and other support to be provided in connection with such
meetings;

	•
	Consult
regularly with the Chair of the Board concerning agenda for Board meetings and concerning materials that will be provided in advance of such meetings;

	•
	Chair
meetings of the Board when the Chairperson of the Board is not available or when the Chairperson of Board is unable to perform such functions (due to conflict or
otherwise); and

	•
	In
conjunction with the Nominating and Corporate Governance Committee, oversee the periodic review by the independent directors of the effectiveness of the Board, and its
Committees who are composed of independent directors. 

 
 

BOARD MEETINGS    
    

        The Board currently plans four meetings each year, with further meetings to occur (or action to be taken by unanimous consent) at the discretion of the Board. The
meetings will usually consist of committee meetings and the Board meeting, extended over two or three days. 

        The
agenda for each Board meeting will be determined by the Board Chair in consultation with the Chief Executive Officer. The agenda will be prepared by the Corporate Secretary.
Management will seek to provide to all directors an agenda and appropriate materials in advance of meetings, although the Board recognizes that this will not always be consistent with the timing of
transactions and the operations of the business and that in certain cases it may not be possible. 

 
 

EXECUTIVE SESSIONS    
    

        All non-management directors will have four regularly scheduled meetings each year, at which only non-management directors are present. In
addition, to ensure free and open discussion and communication among the independent directors of the Board, the independent directors will have two regularly scheduled executive sessions each year,
and more frequently as necessary or desirable, in conjunction with regularly scheduled meetings of the Board. 

 
 

THE COMMITTEES OF THE BOARD    
    

        Chiron shall have at least the committees required by the rules of the Nasdaq Stock Market, Inc. and the Governance Agreement. Except to the extent that
the Board has delegated or delegates in the future its authority to a committee, all power and authority of the Board is reserved by the Board to itself. Currently, Chiron's committees consist of the
Audit Committee, the Compensation Committee, a nominating committee, which at Chiron is called the Nominating and Corporate Governance Committee, the Stock Option Plan Administration Committee, the
Finance Committee and, as may be required from time to time under the terms of the Governance Agreement, a Strategic Planning Committee. 

        The
Chair of each Committee shall set the agenda for meetings of his or her Committee. All directors, whether members of a committee or not, are invited to make suggestions to a
committee chair for additions to the agenda of his or her committee or to request that an item from a committee agenda be considered by the Board. Each committee chair will give a periodic report of
his or her committee's activities to the Board. 

3

 

        Each
of the Nominating and Corporate Governance Committee, the Audit Committee and the Compensation Committee shall be composed of directors who are not officers or employees of Chiron
or its subsidiaries or any other individual having a relationship which, in the opinion of the Board, would interfere with the exercise of independent judgment in carrying out the responsibilities of
a director, and who are otherwise "independent" and qualified to serve as a member of such committee under applicable law and under the rules of the Nasdaq Stock Market, Inc. The required
qualifications for the members of each committee shall be set out in the respective committees' charters. A director may serve on more than one committee for which he or she qualifies. 

 
 

MANAGEMENT DEVELOPMENT AND CEO SUCCESSION    
    

        At least annually, the Board shall review and concur in a succession plan, developed by management, addressing the policies and principles for selecting a
successor to the CEO, both in an emergency situation and in the ordinary course of business. The succession plan should include an assessment of the experience, performance, skills and planned career
paths for possible successors to the CEO. The Board shall receive and review at least annually reports from the CEO regarding senior management development. 

 
 

TRANSACTIONS WITH NOVARTIS    
    

        The Governance Agreement governs certain aspects of the relationship between Chiron and Novartis. Among other things, under the Governance Agreement, Chiron will
not enter into specified agreements or transactions with Novartis without first obtaining the approval of the Independent Directors (as defined in the Governance Agreement) or requisite stockholder
approval. Such governance principles of the Governance Agreement will be considered to be incorporated in, and a part of, these guidelines. 

 
 

BOARD COMPENSATION    
    

        The Compensation Committee shall review periodically and not less frequently than every three years, and report to the Board with its recommendations regarding,
the components and amount of Board compensation, including its evaluation of compensation of boards of similarly situated companies. In order to align the interests of directors and stockholders, the
Board believes that directors should receive a significant part of their on-going compensation in the form of equity in Chiron. Such equity compensation should consist of restricted share
rights which entitle directors to receive shares of Chiron common stock only upon cessation of service on the Board. The Board believes that such restricted share rights, by requiring directors to
maintain an ownership interest in Chiron throughout the directors' tenure, will firmly align directors' interests with the long-term interests of Chiron's stockholders. The Board also
intends to continue to use stock option grants in order to attract leading candidates to serve on the Board, but a significant portion of the stock issued to directors upon exercise of options should
be subject to certain restrictions on transfer to further align the directors' interests with the long-term interests of stockholders. 

 
 

EXPECTATIONS OF DIRECTORS    
    

        The business and affairs of Chiron shall be managed by or under the direction of the Board in accordance with Delaware law. In performing their duties, the
primary responsibility of the directors is to exercise their business judgment in the best interests of Chiron and its stockholders. The Board has developed a number of specific expectations of
directors to promote the discharge of this responsibility and the efficient conduct of the Board's business. 

4

 

        Commitment and Attendance.    All directors should make all reasonable efforts to attend meetings of the Board and meetings of
committees of which they are members. Members may attend by telephone or video conference (when available) to mitigate conflicts. 

        Participation in Meetings.    Each director should be sufficiently familiar with the business of Chiron, including its financial
statements and capital structure, and the risks and competition it faces, to facilitate active and effective participation in the deliberations of the Board and of each committee on which he or she
serves. Upon request, management will make appropriate personnel available to answer any questions a director may have about any aspect of Chiron's business. Directors should review the materials
provided by management and advisors in advance of the meetings of the Board and its committees and should arrive prepared to discuss the issues presented. 

        Loyalty and Ethics.    In their roles as directors, all directors owe a duty of loyalty to Chiron. This duty of loyalty mandates
that the interests of Chiron take precedence over any interests possessed by a director. 

        Chiron
has adopted a Board of Directors Procedure Re: Conflicts of Interest (the "Procedure"), and a Code of Conduct (the "Code"), which includes a compliance program for enforcement.
Both the Procedure and the Code deal with activities of directors, particularly with respect to potential conflicts of interest and the taking of corporate opportunities for personal use. The
Procedure provides, among other things, that conflicts of interest or potential conflicts of interest concerning a director or the CEO are to be reported to the Nominating and Corporate Governance
Committee. Directors should be familiar with the Procedure's and the Code's provisions in these areas and should consult with Chiron's counsel in the event of any issues. 

        Other Directorships.    Chiron values the experience directors bring from other boards on which they serve, but recognizes that
those boards may also present demands on a director's time and availability and may present conflicts or legal issues. Directors should advise the chairperson of the Nominating and Corporate
Governance Committee and the CEO before accepting membership on other boards of directors or other significant commitments involving affiliation with other businesses or governmental units. 

        Contact with Management.    All directors are invited to contact the CEO at any time to discuss any aspect of Chiron's business.
Directors also have complete access to other members of management. The Board expects that there will be frequent opportunities for directors to meet with the CEO and other members of management in
Board and committee meetings and in other formal or informal settings. 

        Further,
the Board encourages management to, from time to time, bring managers into Board meetings who: (a) can provide additional insight into the items being discussed because
of personal involvement and substantial knowledge in those areas, and/or (b) are managers with future potential that the senior management believes should be given exposure to the Board. 

        Contact with Other Constituencies.    It is important that Chiron speak to employees and outside constituencies with a single
voice, and that management serve as the primary spokesperson. 

        Confidentiality.    The proceedings and deliberations of the Board and its committees are confidential. Each director shall
maintain the confidentiality of information received in connection with his or her service as a director. 

 
 

EVALUATING BOARD PERFORMANCE    
    

        The Board, acting through the Nominating and Corporate Governance Committee, should conduct a self-evaluation at least annually to determine whether
it is functioning effectively. The Nominating 

5

 

and
Corporate Governance Committee should periodically consider the mix of skills and experience that directors bring to the Board to assess whether the Board has the necessary tools to perform its
oversight function effectively. 

        Each
committee of the Board should conduct a self-evaluation at least annually and report the results to the Board. Each committee's evaluation must compare the performance
of the committee with the requirements of its written charter, if any. 

 
 

RELIANCE ON MANAGEMENT AND OUTSIDE ADVICE    
    

        In performing its functions, the Board is entitled to rely on the advice, reports and opinions of management, counsel, accountants, auditors and other expert
advisors. The Board shall have the authority to retain and approve the fees and retention terms of its outside advisors. 

6

QuickLinks

Exhibit 10.519

CHIRON CORPORATION CORPORATE GOVERNANCE GUIDELINES

INTRODUCTION

BOARD COMPOSITION

SELECTION OF CHAIRPERSON OF THE BOARD AND CHIEF EXECUTIVE OFFICER

SELECTION OF DIRECTORS

ELECTION TERM

RETIREMENT OF DIRECTORS

PRESIDING DIRECTOR

BOARD MEETINGS

EXECUTIVE SESSIONS

THE COMMITTEES OF THE BOARD

MANAGEMENT DEVELOPMENT AND CEO SUCCESSION

TRANSACTIONS WITH NOVARTIS

BOARD COMPENSATION

EXPECTATIONS OF DIRECTORS

EVALUATING BOARD PERFORMANCE

RELIANCE ON MANAGEMENT AND OUTSIDE ADVICEQuickLinks
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Exhibit 10.626    
    

[CHIRON
LETTERHEAD] 

July 5,
2004 

CONFIDENTIAL

Ursula
B. Bartels

(Address) 

Dear
Ursula: 

        We
are pleased to confirm our offer of employment for you to join Chiron Corporation. 

        Your
employment offer with Chiron is as Vice President and General Counsel, reporting to me. Your starting salary will be $400,000 per annum, paid bi-weekly. 

        You
will be eligible to participate in our stock option program. Subject to the approval of the Board of Directors, you will be awarded a stock option grant to purchase 200,000 shares of
Chiron common stock. The options vest fully over a four-year period, with the first 25% of the shares vesting at the one-year anniversary. Shares vest on a
pro-rated monthly basis over the remaining three years of the vesting period. The exercise price of the option will be set at the fair market value (as defined in the Option Plan) of a
share of Chiron stock on the date the option is approved. We expect the options will be approved and effective within 90 days of your employment date. You are also eligible to participate in
Chiron's Long Term Incentive Program for the
3 year performance cycle beginning 2004. Your target award is 7,500 restricted share rights. Depending upon the performance of the company against predetermined goals, you may receive up to
150% of your target shares. The performance period ends December 31, 2006 and the Compensation Committee of the Board will determine the level of performance goal achievement and the number of
shares, if any, you will be entitled to receive, assuming you are continuously employed for the period. Details of the plan will be furnished to you when you start. 

        Also,
on an annual basis you may be eligible for future stock option grants based on your performance. These annual grants are typically granted in February and are pro-rated
based on your hire date. 

        You
will also be eligible to participate in Chiron's Annual Incentive Plan (AIP). The Plan links corporate, business/functional unit and individual performance goals to support the
accomplishment of Chiron's business goals. The Plan, as structured, has an incentive range for your position from 0% to 150% with a target of 75% of base pay. Ordinarily, plan participants hired
between January 1 and September 30, 2004 are eligible to receive a pro-rated bonus, paid in the first quarter of 2005. 

        You
are eligible for Chiron's relocation assistance program. Prudential Relocation administers the program for Chiron and Joel Spokas is Chiron's account representative with Prudential.
He can provide you with details of the program, but I will send you a summary by separate mailing. His telephone number is 800-210-0299 and his e-mail address is  joel.spokas@prudential.com. 

        As
an inducement for you to join Chiron, we will pay you a bonus of $250,000, payable within your first 2 weeks of employment. This is also intended, in part, to assist in your
relocation. 

        The
information sheets following your offer letter contain some of the highlights of Chiron's benefits programs. You should note that, while this offer is being made under the terms of
our current benefits and compensation programs, changes do occur from time to time and any system-wide changes that occur will apply to you as well. 

        Some
of these programs are effective immediately upon your employment, while others are dependent upon established enrollment periods. Your group medical insurance benefits generally
start on the first day of the month following your date of hire. If, however, your date of hire is the first business day of the month, your coverage
becomes effective on that date. Note also that, with few 

exceptions,
Chiron extends benefits coverage to qualified family members, including opposite- and same-sex domestic partners. You will have an opportunity to learn more about your benefits
and complete the enrollment paperwork at a benefits orientation. The schedule will be provided for you at new hire orientation. 

        If
you have an employment authorization document (EAD) issued by the Immigration and Naturalization Service, please contact Inverleith Fruci in Emeryville, California at
510-923-3733. 

        Your
employment with Chiron is not for any specified term and can be terminated at any time for any reason by you or Chiron. 

        Your
employment pursuant to this offer is contingent on the following: 

	•
	Your
signing the Chiron Employee Invention and Confidential Information Agreement.

	•
	Your
ability, as required by federal law, to establish your employment eligibility as a U.S. citizen, a U.S. lawful permanent resident, or an individual specifically
authorized for employment in the U.S. by the Immigration and Naturalization Service. Please read the enclosed notice specifying the documentation required in this regard.

	•
	Satisfactory
completion of a reference check.

	•
	A
baseline blood sample for archival storage may be required for some lab positions. 

        This
letter constitutes the terms of your employment with us and supersedes any prior representations or agreements, whether written or oral. A duplicate original of this offer letter is
enclosed for your records. To accept employment at Chiron under the terms listed above, please sign and date this letter and return to Chiron. 

        The
Executive Committee and I believe you are a great fit for our requirements at Chiron. Your experience will allow you to make excellent contributions to the success of Chiron as
General Counsel and in your capacity as a member of the Executive Committee of the company. We look forward to your acceptance of our offer and your taking up employment mid-August. 

        If
you have any questions in the meantime, please feel free to contact me or Linda Short. 

Sincerely,

CHIRON
CORPORATION 

/s/
Howard H. Pien

Howard H. Pien

Chairman and Chief Executive Officer 

Enclosures

        Please
indicate your understanding of the terms of this offer and your acceptance of this offer, along with your confirmed start date, by signing this letter and filling out the attached
packet of forms. In order to expedite the processing of your employment records, please return the letter and completed forms to the Chiron Human Resources Department in the
enclosed postage paid envelope as soon as possible. Please keep the copy of your offer letter. 

	/s/ Ursula B. Bartels
 Ursula B. Bartels	 	7/7/04
 Date

 
 

CHIRON CORPORATION
  EMPLOYEE BENEFITS FOR EXECUTIVES AS OF 1/1/2004    
    

	INSURANCE BENEFITS	 	 
	
MEDICAL INSURANCE	
 	

Chiron offers several medical plans to eligible employees and their eligible dependents (spouse, domestic partner and/or children). All medical plans include prescription and vision benefits. Employee contributions are pretax.
	
DENTAL INSURANCE	
 	

Chiron offers 2 dental plans to eligible employees and their eligible dependents (spouse, domestic partner and/or children). Employee contributions are pretax.
	
LIFE INSURANCE	
 	

Eligible employees can purchase coverage for themselves of $10,000, or 1, 2, 3, 4 or 5 times annual salary. The maximum coverage is $1.6 million. Employee contributions are pretax.
	
DEPENDENT LIFE INSURANCE	
 	

Eligible employees can purchase life insurance coverage for eligible dependents on an after-tax basis. Options include $10,000, $20,000 or $50,000 for spousal/domestic partner coverage and $5,000 or $10,000 for children.
	
ACCIDENTAL DEATH & DISMEMBERMENT	
 	

Eligible employees can purchase coverage for themselves of 1, 2, 3, 4 or 5 times annual salary. The maximum coverage is The maximum coverage is $1.6 million. Employee contributions are pretax.
	
TRAVEL ACCIDENT	
 	

Chiron provides Travel Accident Insurance coverage of 3 times annual salary at no cost to employees. This provides 24-hour coverage for travel to and from work or on company business.
	
EXECUTIVE SHORT-TERM DISABILITY	
 	

Through the short-term disability program, Chiron provides eligible employees with 100% of salary for the first 30 calendar days less state disability payments, and 80% of salary for the next 150 days of disability less state disability
payments. Chiron provides this coverage at no cost to the employee.
	
LONG-TERM DISABILITY	
 	

For eligible employees disabled for more than 180 days, Chiron provides 60% of monthly salary up to $18,000. Chiron provides this coverage at no cost to the employee. Eligible employees also have the option to purchase an additional
62/3% of monthly salary up to $20,000 on a pretax basis.
	
WORKERS' COMPENSATION	
 	

All employees are covered by Chiron's Workers' Compensation insurance.
	
INVESTMENT PROGRAMS	
 	

 
	
401(k) PLAN	
 	

Participation in the Chiron Corporation 401(k) plan is available to eligible employees on the date of hire. Upon hire, an employee can enroll immediately at 5% pre-tax deferral into a company selected investment fund. Upon receiving a personal
identification number (PIN), an employee may designate pre-tax contributions of 1% to 25% of salary and direct contributions to any of nine investment funds. The Company provides a maximum 4% match on employee contributions and the match is vested
immediately.
	 	 	 

	
SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN	
 	

All officers of Chiron at the level of Executive or above are eligible to participate in the Supplemental Executive Retirement Plan (SERP). SERP is designed to allow participants to make before-tax contributions for retirement that would otherwise
exceed the Internal Revenue Service's maximum contribution limits allowed in Chiron's 401(k) plan. Similarly, SERP allows the company to match contributions toward retirement in excess of the 401(k) plan's limits.
	
EMPLOYEE STOCK PURCHASE PLAN	
 	

Eligible employees may purchase Chiron stock at a discount below market price. Participation in the plan depends upon the employee's date of hire. Employees can contribute to this program from 3% to 15% of their base salary on an after-tax
basis.
	
TIME-OFF BENEFITS	
 	

 
	
EXECUTIVE TIME OFF	
 	

Each January 1, executive employees receive an allocation of 4 weeks of time off. The allocation may be taken in whole or in part anytime throughout the year. Any unused time at the end of the year will not accrue from year to year. No reporting
of time off is needed. There will be no pay out for unused time off either at the end of the year nor at termination.
	
FIXED HOLIDAYS	
 	

Eligible employees receive up to 8 paid holidays per year.
	
LEAVE OF ABSENCE	
 	

Chiron grants leaves of absence to accommodate employees' medical/maternity disability and family or personal needs.
	
OTHER BENEFITS	
 	

 
	
FLEXIBLE SPENDING	
 	

Chiron offers Health Care and Dependent Care reimbursement accounts to eligible employees. These accounts give employees the advantage of paying for eligible health and dependent care expenses with pretax dollars.
	
EMPLOYEE ASSISTANCE PROGRAM	
 	

Chiron provides a confidential counseling and referral service to all employees and their families.
	
EDUCATIONAL ASSISTANCE	
 	

Regular full-time employees are eligible, after 6 months of service, for up to $5,250 per year in reimbursement of tuition, textbooks, and lab expenses for classes directly related to their jobs.
	
CREDIT UNION	
 	

Regular full-time and part-time employees and members of their families or household are eligible to join.
	
PREPAID LEGAL	
 	

A Prepaid Legal Plan is available to eligible employees to provide affordable, basic legal services. Employees pay for this benefit on an after-tax basis.
	
DEPENDENT CARE CONNECTION	
 	

Eligible employees are provided with this counseling, education and referral service which provides information regarding child care, elder care, adoption and prenatal planning.

NOTE: Eligible employees are defined as regularly scheduled to work 20 hours or more per week. Coverage for most benefits is effective the first of the month following
date of hire, or immediately if the date of hire is the first business day of the month, unless otherwise noted.

QuickLinks

Exhibit 10.626

CHIRON CORPORATION EMPLOYEE BENEFITS FOR EXECUTIVES AS OF 1/1/2004

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