title: Evidence for a single opioid receptor type on the field stimulated rat vas deferens.
mesh_terms: D000818:Animals; D001562:Benzimidazoles / Q000494:pharmacology; D004305:Dose-Response Relationship, Drug; D004558:Electric Stimulation; D004723:Endorphins / Q000494:pharmacology; D004745:Enkephalins / Q000494:pharmacology; D005048:Etorphine / Q000494:pharmacology; D005283:Fentanyl / Q000031:analogs & derivatives / Q000494:pharmacology; D008297:Male; D009020:Morphine / Q000494:pharmacology; D010111:Oxymorphone / Q000494:pharmacology; D051381:Rats; D011919:Rats, Inbred Strains; D011957:Receptors, Opioid / Q000187:drug effects / Q000378:metabolism*; D017409:Sufentanil; D014649:Vas Deferens / Q000378:metabolism*; D001615:beta-Endorphin
chemical_list: D001562:Benzimidazoles; D004723:Endorphins; D004745:Enkephalins; D011957:Receptors, Opioid; D005048:Etorphine; D001615:beta-Endorphin; C033505:enkephalin, Ala(2)-N-pentyl-PheNH(4)-; D009020:Morphine; D010111:Oxymorphone; D017409:Sufentanil; D005283:Fentanyl