1. Department of Biochemistry (P.L., F.L.), San Antonio, Texas 78229
2. Department of Cellular & Structural Biology (L.Q.D.), San Antonio, Texas 78229
3. Department of Pharmacology (F.J.R., D.H., F.L.), The University of Texas Health Science Center, San Antonio, Texas 78229
4. Diabetes Unit, National Center for Complementary and Alternative Medicine (M.J.Q., Y.L.), National Institutes of Health, Bethesda, Maryland 20892-1755