title: Alterations in beta-endorphin-induced locomotor activity in morphine-tolerant rats.
mesh_terms: D000818:Animals; D001522:Behavior, Animal / Q000187:drug effects; D004347:Drug Interactions; D004361:Drug Tolerance; D004723:Endorphins / Q000494:pharmacology*; D008297:Male; D009020:Morphine / Q000494:pharmacology*; D009043:Motor Activity / Q000187:drug effects*; D051381:Rats; D013997:Time Factors; D001615:beta-Endorphin
chemical_list: D004723:Endorphins; D001615:beta-Endorphin; D009020:Morphine