1. Departments of Medicine, and Molecular and Cellular Pharmacology (L.-J.Y., J.A.M., J.W., A.K., G.L.C., D.P.), University of California, San Francisco, California 94107-2140
2. Department of Nephrology (L.-J.Y.), Union Hospital, Tongji Medical College, Huazhong University of Science & Technology, Wuhan, Hubei, P.R.China
3. Department of Medicine (J.A.M.), Division of Nephrology and Hypertension, Oregon Health & Science University, Portland, Oregon 97239
4. UCSF Diabetes Center (K.Y.Y., M.S.G.), University of California, San Francisco 94143, California
5. Department of Physiology (K.M.B., F.L.), University of Tuebingen, D-72076 Tuebingen, Germany
6. Department of Medicine (M.J.B.), University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104