Research ArticleNEUROPHARMACOLOGY
Inverse Agonist Action of Leu-Enkephalin at δ2-Opioid Receptors Mediates Spinal Antianalgesia
Jodie J. Rady, Blythe B. Holmes, Leon F. Tseng and James M. Fujimoto
Journal of Pharmacology and Experimental Therapeutics May 2001, 297 (2) 582-589;