title: Morphine and experimental pain in identical twins.
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D001007:Anxiety; D003072:Cognition Disorders / Q000523:psychology; D003080:Cold Temperature; D005221:Fatigue; D005260:Female; D006791:Hostility; D006801:Humans; D008297:Male; D009020:Morphine / Q000008:administration & dosage*; D010146:Pain / Q000235:genetics* / Q000523:psychology; D011247:Pregnancy; D012684:Sensory Thresholds; D014427:Twins / Q000523:psychology; D014430:Twins, Monozygotic / Q000523:psychology
chemical_list: D009020:Morphine