title: Differentiation between opioid peptides by naltrexone.
mesh_terms: D000818:Animals; D006168:Guinea Pigs; D007082:Ileum / Q000187:drug effects; D066298:In Vitro Techniques; D008297:Male; D051379:Mice; D009270:Naloxone / Q000031:analogs & derivatives*; D009271:Naltrexone / Q000494:pharmacology*; D010455:Peptides / Q000037:antagonists & inhibitors / Q000494:pharmacology*; D014649:Vas Deferens / Q000187:drug effects
chemical_list: D010455:Peptides; D009270:Naloxone; D009271:Naltrexone