The search for the ideal analgesic.
D000701:Analgesics, Opioid; D000818:Animals; D051379:Mice; D009020:Morphine / Q000302:isolation & purification*; D009292:Narcotic Antagonists / Q000302:isolation & purification*; D051381:Rats
D000701:Analgesics, Opioid; D009292:Narcotic Antagonists; D009020:Morphine