| Independent Directors | Audit Committee Financial Expert | Audit Committee | Compensation Committee | Corporate Governance Committee |
| Francis J. Bullock, Ph.D. |  |  | Chairperson | Member |
| Gwen A. Fyfe, M.D. |  |  | | |
|
Kyle A. Lefkoff Executive Chairman |  |  | | |
| Gil J. Van Lunsen | Yes | Chairperson | Member | |  |
| John L. Zabriskie, Ph.D. | Yes | Member | Member | Chairperson |