The human twin.
D001699:Biometry; D004493:Education; D005260:Female; D006801:Humans; D008297:Male; D008393:Marriage; D010551:Personality; D011247:Pregnancy; D012934:Social Isolation; D013688:Telepathy; D014427:Twins / Q000523:psychology*; D014430:Twins, Monozygotic / Q000523:psychology*