RT Journal Article SR Electronic T1 The ambiguities of opioid tolerance mechanisms: barriers to pain therapeutics or new pain therapeutic possibilities JF Journal of Pharmacology and Experimental Therapeutics JO J Pharmacol Exp Ther FD American Society for Pharmacology and Experimental Therapeutics DO 10.1124/jpet.107.135533 A1 Alan R. Gintzler A1 Sumita Chakrabarti YR 2008 UL http://jpet.aspetjournals.org/content/early/2008/03/19/jpet.107.135533.abstract AB