1. Division of Hypothalamic Research (K.W.K., J.K.E.), Dallas, Texas 75390
2. Division of Endocrinology (K.W.K., K.L.P.), Departments of Internal Medicine and Pharmacology, University of Texas Southwestern Medical Center, Dallas, Texas 75390
3. Transgenic Animal Center (S.L., H.Z., B.P., L.Z.), National Institute of Biological Science, Beijing, China 102206
4. Department of Biomedical Sciences (S.A.T.), Colorado State University, Fort Collins, Colorado 80523