title: The effects of drugs on pain threshold in rats.
mesh_terms: D000818:Animals; D004824:Epidural Space; D009020:Morphine / Q000494:pharmacology*; D009270:Naloxone / Q000494:pharmacology*; D010146:Pain / Q000188:drug therapy*; D051381:Rats; D012684:Sensory Thresholds
chemical_list: D009270:Naloxone; D009020:Morphine