RT Journal Article SR Electronic T1 Differential conditioned place preference responses to endomorphin-1 and endomorphin-2 microinjected into the posterior nucleus accumbens shell and ventral tegmental area in the rat JF Journal of Pharmacology and Experimental Therapeutics JO J Pharmacol Exp Ther FD American Society for Pharmacology and Experimental Therapeutics DO 10.1124/jpet.103.059287 A1 Maia Terashvili A1 Hsiang-En Wu A1 Randy J. Leitermann A1 Kuei-chun Hung A1 Andrew D. Clithero A1 Emma T. Schwasinger A1 Leon F. Tseng YR 2004 UL http://jpet.aspetjournals.org/content/early/2004/01/30/jpet.103.059287.abstract AB