OtherANALGESIA AND DRUGS OF ABUSE
Differential Effects of Intrathecally AdministeredDelta and Mu Opioid Receptor Agonists on Formalin-Evoked Nociception and on the Expression of Fos-like Immunoreactivity in the Spinal Cord of the Rat
Donna L. Hammond, Huilan Wang, Nora Nakashima and Allan I. Basbaum
Journal of Pharmacology and Experimental Therapeutics January 1998, 284 (1) 378-387;