title: A further characterization of the differential effects of leucine enkephalin, methionine enkephalin and their analogs on morphine-induced analgesia.
mesh_terms: D000758:Anesthesia; D000818:Animals; D001522:Behavior, Animal / Q000187:drug effects; D004357:Drug Synergism; D004723:Endorphins / Q000494:pharmacology*; D004745:Enkephalins / Q000494:pharmacology*; D008297:Male; D051379:Mice; D009020:Morphine / Q000494:pharmacology*; D009270:Naloxone / Q000494:pharmacology; D013329:Structure-Activity Relationship; D013997:Time Factors
chemical_list: D004723:Endorphins; D004745:Enkephalins; D009270:Naloxone; D009020:Morphine