title: Lack of cross-tolerance between morphine and Leu-enkephalin in the mouse vas deferens.
mesh_terms: D000818:Animals; D004361:Drug Tolerance; D004558:Electric Stimulation; D004723:Endorphins / Q000494:pharmacology*; D004745:Enkephalins / Q000494:pharmacology*; D008297:Male; D051379:Mice; D009020:Morphine / Q000494:pharmacology*; D009119:Muscle Contraction / Q000187:drug effects*; D009130:Muscle, Smooth / Q000187:drug effects*; D009270:Naloxone / Q000494:pharmacology; D009469:Neuromuscular Junction / Q000187:drug effects; D011957:Receptors, Opioid / Q000187:drug effects; D014649:Vas Deferens / Q000294:innervation
chemical_list: D004723:Endorphins; D004745:Enkephalins; D011957:Receptors, Opioid; D009270:Naloxone; D009020:Morphine