1. Division of Endocrinology and Metabolism, Department of Medicine, Veterans Administration Medical Center, University of California-San Diego (M.C., P.V., N.N., S.M., J.M.O.), La Jolla, California 92093;
2. the Program in Molecular Medicine and Department of Biochemistry and Molecular Biology, University of Massachusetts Medical Center (J.K., M.P.C.), Worcester, Massachusetts 01605