MATERIALS AND METHODS Abbreviations ACTH, adrenocorticotropic hormone CAMP,3',5'-cyclic adenylate BSA, bovine serum albumin BW, body weight CBG, corticosteroid-bindingglobulin PTU, n-propylthiouracil T4, L-thyroxine ip, intraperitoneal MCR, metabolic clearance rate In the neonatal rat, circulating...