1. Division of Molecular Genetics (K.G., J.E.M., L.C., D.L., S.C., Y.Z.), The University of Texas Southwestern Medical Center, Dallas, Texas 75390
2. Departments of Cell Biology and Anatomy (T.L.), The University of Texas Southwestern Medical Center, Dallas, Texas 75390
3. Medicine (Y.-H.Y.), Columbia University, College of Physicians and Surgeons, New York, New York 10032
4. Department of Physiology (G.Y., C.L.), The University of Texas Southwestern Medical Center, Dallas, Texas 75390
5. Department of Pediatrics, Naomi Berrie Diabetes Center (Y.Z.), The University of Texas Southwestern Medical Center, Dallas, Texas 75390