Research ArticleBEHAVIORAL PHARMACOLOGY
Effects of Opioids in Morphine-Treated Pigeons Trained to Discriminate among Morphine, the Low-Efficacy Agonist Nalbuphine, and Saline
Ellen A. Walker, Mitchell J. Picker, Arthur Granger and Linda A. Dykstra
Journal of Pharmacology and Experimental Therapeutics July 2004, 310 (1) 150-158; DOI: https://doi.org/10.1124/jpet.103.058503