title: Potencies of normorphine and met-enkephalin in the vas deferens of different strains of mice.
mesh_terms: D000818:Animals; D004723:Endorphins / Q000494:pharmacology*; D004745:Enkephalins / Q000494:pharmacology*; D008297:Male; D051379:Mice; D008815:Mice, Inbred Strains; D009022:Morphine Derivatives / Q000494:pharmacology*; D009119:Muscle Contraction / Q000187:drug effects; D013045:Species Specificity; D014649:Vas Deferens / Q000187:drug effects / Q000502:physiology*
chemical_list: D004723:Endorphins; D004745:Enkephalins; D009022:Morphine Derivatives