title: Tetrapeptide-amide analogues of enkephalin: the role of C-terminus in determining the character of opioid activity.
mesh_terms: D000818:Animals; D001522:Behavior, Animal / Q000187:drug effects; D001681:Biological Assay; D004558:Electric Stimulation; D004723:Endorphins / Q000494:pharmacology*; D004745:Enkephalins / Q000494:pharmacology*; D007082:Ileum / Q000187:drug effects / Q000502:physiology; D008297:Male; D051379:Mice; D009119:Muscle Contraction / Q000187:drug effects; D051381:Rats; D013329:Structure-Activity Relationship; D014649:Vas Deferens / Q000187:drug effects
chemical_list: D004723:Endorphins; D004745:Enkephalins