1. Departments of Medicine (J.W.), Springfield, Illinois 62701
2. Microbiology Immunology (P.M.), Southern Illinois University School of Medicine, Springfield, Illinois 62701
3. the Second Department of Internal Medicine, Chiba University School of Medicine (K.T.), Chiba 260, Japan
4. the Cell Regulation Section, Metabolic Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health (L.D.K.), Bethesda, Maryland 20892