title: Evidence for a single opioid receptor type on the rat deferens.
mesh_terms: D000818:Animals; D004723:Endorphins / Q000494:pharmacology; D008297:Male; D009020:Morphine / Q000494:pharmacology; D009292:Narcotic Antagonists / Q000494:pharmacology; D051381:Rats; D011919:Rats, Inbred Strains; D011957:Receptors, Opioid / Q000032:analysis* / Q000187:drug effects; D014649:Vas Deferens / Q000032:analysis*; D001615:beta-Endorphin
chemical_list: D004723:Endorphins; D009292:Narcotic Antagonists; D011957:Receptors, Opioid; D001615:beta-Endorphin; D009020:Morphine