title: Identical twins discordant for heroin abuse: case report.
abstract: A case of monozygotic twins is reviewed in which one twin was a heavy abuser of heroin and other illicit drugs while his co-twin was adamantly opposed to drug abuse. The drug-abusing twin was the first born, had a higher birthweight and took a leadership role, while his twin enjoyed extra care in infancy and was less adventuresome.
mesh_terms: D000328:Adult; D000374:Aggression; D001722:Birth Order; D001724:Birth Weight; D002657:Child Development; D004200:Diseases in Twins; D005260:Female; D006556:Heroin Dependence / Q000235:genetics* / Q000523:psychology; D006801:Humans; D007857:Leadership; D008297:Male; D010287:Parent-Child Relations; D011247:Pregnancy; D014430:Twins, Monozygotic