1. Department of Biochemistry, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA.
2. Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA.
3. Quantitative Biomedical Research Center, Department of Clinical Sciences, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA.
4. Harold C. Simmons Comprehensive Cancer Center, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA.
5. Medical Scientist Training Program, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA.