RT Journal Article SR Electronic T1 Differential regulation of receptor activation and agonist selectivity by highly conserved tryptophans in the nicotinic acetylcholine receptor binding site JF Journal of Pharmacology and Experimental Therapeutics JO J Pharmacol Exp Ther FD American Society for Pharmacology and Experimental Therapeutics DO 10.1124/jpet.109.151225 A1 Dustin K. Williams A1 Clare Stokes A1 Nicole A. Horenstein A1 Roger L. Papke YR 2009 UL http://jpet.aspetjournals.org/content/early/2009/04/01/jpet.109.151225.abstract AB