Minimal structural requirements for agonist and antagonist bioactivities of alfa-melanotropin - Sawyer, T K; Al-Obeidi, F; Wilkes, B C; Castrucci, Ana Maria de Lauro; Staples, D J; De Vaux, A E; Affholter, J A; Kruby, V J; Hadley, M E (American Peptide Symposium, 1987)