1. Department of Surgery, Johns Hopkins University (M.S.), Baltimore, Maryland 21287
2. Cell Regulation Section, Metabolic Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases (M.S., S.-i.T., K.S., C.G., G.N., J.S., M.S., B.F., L.D.K.), National Institutes of Health, Bethesda, Maryland 20892
3. Departments of Cancer Biology and Medicine, Harvard School of Public Health and Harvard Medical School (A.M.R.), Boston, Massachusetts 02115
4. Experimental Immunology Branch, National Cancer Institute (D.S.S.), National Institutes of Health, Bethesda, Maryland 20892