Structure-activity relationships of methionine-enkephalin.
D000818:Animals; D006168:Guinea Pigs; D007082:Ileum / Q000187:drug effects; D066298:In Vitro Techniques; D008297:Male; D008715:Methionine / Q000494:pharmacology; D051379:Mice; D009119:Muscle Contraction / Q000187:drug effects; D009130:Muscle, Smooth / Q000187:drug effects; D009842:Oligopeptides / Q000494:pharmacology*; D013329:Structure-Activity Relationship; D014649:Vas Deferens / Q000187:drug effects
D009842:Oligopeptides; D008715:Methionine