Committee Composition

Director Name	Audit Committee	Compensation Committee	Nominating & Corporate Governance Committee
Steven D. Nathan, MD			Member of the Nominating & Corporate Governance CommitteeNominating & Corporate Governance Committee
Sandra Milligan, MD		Member of the Compensation CommitteeCompensation Committee	Chairperson of the Nominating & Corporate Governance CommitteeNominating & Corporate Governance Committee
John Quisel, PhD, JD	Member of the Audit CommitteeAudit Committee
Skye Drynan	Chairperson of the Audit CommitteeAudit Committee
Thomas Daniel, MD		Member of the Compensation CommitteeCompensation Committee	Member of the Nominating & Corporate Governance CommitteeNominating & Corporate Governance Committee
Russell J. Cox	Member of the Audit CommitteeAudit Committee	Chairperson of the Compensation CommitteeCompensation Committee

= Chairperson = Member

Investors