Abstract
Evidence for delta opioid receptor subtypes in rat spinal cord: studies with intrathecal naltriben, cyclic[D-Pen2, D-Pen5] enkephalin and [D-Ala2, Glu4]deltorphin.
P E Stewart and D L Hammond
Journal of Pharmacology and Experimental Therapeutics August 1993, 266 (2) 820-828;