1. Division of Nephrology, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205;
2. Nephrology Unit, University of Rochester Medical Center, Rochester, New York 14642;
3. Division of Molecular Biology, Henry Ford Hospital, Detroit 48202;
4. Department of Surgery, University of Texas Health Science Center and the Audie Murphy Veterans Administration Hospital, San Antonio, Texas 78284; and
5. School of Medicine, Tokushima University, Tokushima 770, Japan
6. Division of Nephrology, Department of Medicine and Veterans Affairs Medical Center, University of Michigan, Ann Arbor 48109;
7. Department of Physiology, College of Human Medicine, Michigan State University, East Lansing, Michigan 48824;