title: Morphine like activity of some new Met-enkephalin analogues.
mesh_terms: D000700:Analgesics; D000818:Animals; D002415:Cats; D003655:Decerebrate State; D004723:Endorphins / Q000494:pharmacology*; D004745:Enkephalins / Q000037:antagonists & inhibitors / Q000138:chemical synthesis / Q000494:pharmacology*; D005260:Female; D006168:Guinea Pigs; D066298:In Vitro Techniques; D008297:Male; D051379:Mice; D009020:Morphine / Q000494:pharmacology*; D009119:Muscle Contraction / Q000187:drug effects; D009130:Muscle, Smooth / Q000187:drug effects; D009270:Naloxone / Q000494:pharmacology; D011930:Reaction Time / Q000187:drug effects; D012119:Respiration / Q000187:drug effects
chemical_list: D000700:Analgesics; D004723:Endorphins; D004745:Enkephalins; D009270:Naloxone; D009020:Morphine