title: Comparative study on analgesic effect of Met5-enkephalin and related lipotropin fragments.
mesh_terms: D000698:Analgesia; D000818:Animals; D007082:Ileum; D007276:Injections, Intraventricular; D007700:Kinetics; D008297:Male; D009020:Morphine / Q000494:pharmacology; D009842:Oligopeptides / Q000008:administration & dosage / Q000494:pharmacology*; D051381:Rats; D011955:Receptors, Drug; D013329:Structure-Activity Relationship; D008083:beta-Lipotropin / Q000494:pharmacology*
chemical_list: D009842:Oligopeptides; D011955:Receptors, Drug; D009020:Morphine; D008083:beta-Lipotropin