James E. Stowers Jr.
Co-Founder
     Stowers Institute for Medical Research
Co-Chairman of the Board
     Stowers Resource Management
Founder and Co-Chairman of the Board
     American Century Companies, Inc.

Richard W. Brown
Chairman of the Board
     Stowers Institute for Medical Research
Co-Chairman of the Board
     Stowers Resource Management
Co-Chairman of the Board
     American Century Companies, Inc.

David M. Chao, Ph.D.
President and Chief Executive Officer
     Stowers Institute for Medical Research
Co-Chairman of the Board
      BioMed Valley Discoveries, Inc.

William B. Neaves, Ph.D.
President Emeritus
     Stowers Institute for Medical Research

Roderick L. Sturgeon
Executive Vice President and Chief Financial Officer
     Stowers Resource Management

David A. Welte
Executive Vice President and General Counsel
     Stowers Resource Management

Board of Directors - Stowers Resource Management