1. Department of Cellular and Molecular Physiology, Yale University School of Medicine, New Haven, CT 06510
2. Program in Membrane Biology and Renal Unit, Massachusetts General Hospital, Charlestown, MA 02129
3. Department of Medicine, Harvard Medical School, Boston, MA 02115
4. Department of Molecular and Integrative Physiology, University of Illinois at Urbana-Champaign, Urbana, IL 61801