1. Division of Nephrology, Department of Medicine (V.B., H.L., A.C.P., J.W., D.P.), San Francisco, California 94143-0532
2. Department of Pharmacology and Toxicology, University of Lausanne (D.D., O.S.), CH-1005 Lausanne, Switzerland
3. Department of Physiology, University of Texas Health Science Center (L.P.L., J.D.S.), San Antonio, Texas 78229-3900
4. Institut National de la Santé et de la Recherche Médicale, Unité 478, Faculté de Médecine Xavier Bichat (A.V.), 75870 Paris, France
5. Department of Cellular and Molecular Pharmacology (D.P.), University of California, San Francisco, California 94143-0532