1. Departments of Cell Biology, Biochemistry, and Medicine (E.R.I., D.B.J., M.H.K., Q.S., N.M., G.G.), State University of New York-Health Science Center, Brooklyn, New York 11201
2. Department of Biology (K.K.), Jichi Medical School, Tochigi, Japan
3. Department of Internal Medicine (J.R.S.), University of Missouri-Columbia and the H. S. Truman Veterans Affairs Medical Center, Columbia, Missouri 65212