Proceedings: Some aspects of morphine tolerance.
D000109:Acetylcholine / Q000502:physiology; D000818:Animals; D004361:Drug Tolerance; D009020:Morphine / Q000494:pharmacology*; D009638:Norepinephrine / Q000502:physiology; D051381:Rats; D012701:Serotonin / Q000502:physiology
D012701:Serotonin; D009020:Morphine; D000109:Acetylcholine; D009638:Norepinephrine