title: Morphine, but not diacetyl morphine (heroin), possess opiate antagonist activity in the mouse vas deferens.
mesh_terms: D000818:Animals; D003932:Heroin / Q000494:pharmacology; D066298:In Vitro Techniques; D008297:Male; D051379:Mice; D009020:Morphine / Q000494:pharmacology*; D009270:Naloxone / Q000494:pharmacology; D009292:Narcotic Antagonists; D011957:Receptors, Opioid / Q000187:drug effects; D017465:Receptors, Opioid, delta; D017450:Receptors, Opioid, mu; D014649:Vas Deferens / Q000187:drug effects*
chemical_list: D009292:Narcotic Antagonists; D011957:Receptors, Opioid; D017465:Receptors, Opioid, delta; D017450:Receptors, Opioid, mu; D009270:Naloxone; D003932:Heroin; D009020:Morphine