Effect of enkephalin analogues Tyr-D-Ala-Gly-Phe-Cys(Et) and Tyr-D-Ala-Gly-Phe-Cys(Bu) on prolactin and growth hormone release in rats. - Nedvidkova,J.; Kasafirek,E.; Dlabac,A. (Endocrinol Exp, 1988)