Multiple Receptors for Opiates and Opioid Peptides Hans W Kosterlitz, 'Multiple Receptors for Opiates and Opioid Peptides' reprinted from A M Gotto, Jr., E J Peck, Jr. and A E Boyd, III, eds., 'Brain Peptides: A New Endocrinology' (Elsevier, 1979), 373 - 383. 1979