title: Conformation and biological activities of hexapeptides related to enkephalins: respective roles of the ammonium and hydroxyl groups of tyrosine.
mesh_terms: D000818:Animals; D004723:Endorphins / Q000494:pharmacology*; D004745:Enkephalins / Q000494:pharmacology*; D006168:Guinea Pigs; D007082:Ileum / Q000187:drug effects; D066298:In Vitro Techniques; D008297:Male; D051379:Mice; D008968:Molecular Conformation; D009119:Muscle Contraction / Q000187:drug effects; D009130:Muscle, Smooth / Q000187:drug effects; D009842:Oligopeptides / Q000494:pharmacology*; D000644:Quaternary Ammonium Compounds / Q000494:pharmacology; D013329:Structure-Activity Relationship; D014443:Tyrosine / Q000494:pharmacology*; D014649:Vas Deferens / Q000187:drug effects
chemical_list: D004723:Endorphins; D004745:Enkephalins; D009842:Oligopeptides; D000644:Quaternary Ammonium Compounds; D014443:Tyrosine