Institution: | From the Departments of ‡Medicine and ;§Biochemistry and Molecular Biology, University of Florida, Gainesville, Florida 32610.;the ¶Department of Medicine, University of Chicago, Chicago, Illinois 60637.;the ‖Division of Nephrology, Department of Medicine, Emory University, Atlanta, Georgia 30322, and ;the **Research Service, Atlanta Veterans Affairs Medical Center, Atlanta, Georgia 30033 |