XYY karyotype in monozygotic twins.
D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D002869:Chromosome Aberrations; D005260:Female; D006801:Humans; D007223:Infant; D007621:Karyotyping; D008297:Male; D011247:Pregnancy; D011584:Psychology; D012730:Sex Chromosomes; D014427:Twins