title: Electroencephalographic and behavioral tolerance and cross-tolerance to morphine and methadone in the rat.
mesh_terms: D000818:Animals; D001522:Behavior, Animal / Q000187:drug effects*; D004361:Drug Tolerance; D004569:Electroencephalography; D004576:Electromyography; D005260:Female; D008691:Methadone / Q000494:pharmacology*; D009020:Morphine / Q000494:pharmacology*; D051381:Rats; D012890:Sleep / Q000187:drug effects; D012895:Sleep, REM / Q000187:drug effects; D014851:Wakefulness / Q000187:drug effects
chemical_list: D009020:Morphine; D008691:Methadone