1. Departments of Metabolic Disorders (H.Y.C., M.E.T., A.S.C., D.T.W., J.R.A., E.G.F., Z.S., D.J.M., S.D.F., X.-M.G., L.H.T.V.d.P., A.D.H., D.J.M., S.Q.), Merck Research Laboratories, Rahway, New Jersey 07065
2. Department of Medicinal Chemistry (Z.Y., R.P.N.), Merck Research Laboratories, Rahway, New Jersey 07065
3. Huffington Center on Aging (R.G.S.), Baylor College of Medicine, Houston, Texas 77030