Expression of the glucose-dependent insulinotropic peptide (GIP) gene and chronic homologous desensitization of its receptor in diabetic rats: C-C. Tseng, M.O. Boylan, L.A. Jarboe, T.B. Usdin, and M.M. Wolfe. Gastroenterology Division, Brigham and Women's Hospital and Harvard Medical School, Boston, MA; and Laboratory of Cell Biology, National Institute of Mental Health, Bethesda, MD