Selective breeding for high and low levels of opiate-induced analgesia in mice.
D000698:Analgesia; D000818:Animals; D001947:Breeding; D005260:Female; D007981:Levorphanol / Q000494:pharmacology*; D008297:Male; D051379:Mice; D008815:Mice, Inbred Strains / Q000235:genetics*
D007981:Levorphanol