1. Translational Metabolism Unit (A.B., R.N., M.M.), Division of Diabetes, Endocrinology and Metabolism, Baylor College of Medicine, Houston, Texas 77030
2. Endocrine Service (A.B., R.N.), Ben Taub General Hospital, Houston, Texas 77030
3. Robert H. Williams Laboratory (C.S.H.), University of Washington, Seattle, Washington 98195
4. Novartis, Inc. (M.M.), CH-4002 Basel, Switzerland