title: Comparative study on the effect of morphine and the opioid-like peptides in the vas deferens of rodents: species and strain differences, evidence for multiple opiate receptors.
mesh_terms: D000818:Animals; D004723:Endorphins / Q000494:pharmacology*; D004744:Enkephalin, Methionine / Q000031:analogs & derivatives*; D004745:Enkephalins / Q000494:pharmacology*; D006168:Guinea Pigs; D008297:Male; D051379:Mice; D008813:Mice, Inbred ICR; D009020:Morphine / Q000494:pharmacology*; D009022:Morphine Derivatives / Q000494:pharmacology; D010455:Peptides / Q000494:pharmacology*; D051381:Rats; D011957:Receptors, Opioid / Q000502:physiology*; D013045:Species Specificity; D014649:Vas Deferens / Q000187:drug effects*; D001615:beta-Endorphin
chemical_list: D004723:Endorphins; D004745:Enkephalins; D009022:Morphine Derivatives; D010455:Peptides; D011957:Receptors, Opioid; D004744:Enkephalin, Methionine; D001615:beta-Endorphin; C022118:enkephalinamide-Met, Ala(2)-; D009020:Morphine; C010616:normorphine