1. From the E. P. Joslin Research Laboratory, Peter Bent Brigham Hospital, Massachusetts General Hospital, New England Deaconess Hospital, Children's Hospital Medical Center and the departments of Medicine, Surgery, Pathology and Pediatrics, Harvard Medical School, and the Tufts-New England Medical Center, Tufts University Medical School and the Joslin Clinic, Boston (address reprint requests to Dr. Ganda at One Joslin Place, Boston, MA 02215).