COMMITTEE COMPOSITION

Independent Director Audit Committee Compensation Committee Nominating and Governance Committee
Stelios Papadopoulos Ph.D. Independent Director Audit Committee Nominating and Governance Committee
David Baltimore Ph.D. Independent Director Nominating and Governance Committee
Kathryn J. Collier Independent Director Audit Committee
Jake R. Nunn Independent Director Audit Committee
William Rastetter Ph.D. Independent Director Compensation Committee
Hugh Rosen Independent Director Compensation Committee
Simos Simeonidis, Ph.D. Independent Director Nominating and Governance Committee
Pascale Witz Independent Director Compensation Committee
= Independent Director = Chairperson = Member = Chairman of the Board