RT Journal Article SR Electronic T1 Resting and Evoked Spinal Substance P Release during Chronic Intrathecal Morphine Infusion: Parallels with Tolerance and Dependence JF Journal of Pharmacology and Experimental Therapeutics JO J Pharmacol Exp Ther FD American Society for Pharmacology and Experimental Therapeutics DO 10.1124/jpet.105.087718 A1 Guibao Gu A1 Ichiro Kondo A1 Xiao-Ying Hua A1 Tony L Yaksh YR 2005 UL http://jpet.aspetjournals.org/content/early/2005/05/20/jpet.105.087718.abstract AB