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XYY Karyotype in a Pair of Monozygotic Twins: A 17-Year Life-History Study

We have recently had the opportunity to investigate clinical and behavioural characteristics of a pair of 17-year-old twin boys who were discovered to have the XYY karyotype (18). Since these twins, known to this department since infancy, had been studied at the age of three, early direct findings as well as retrospective data are available regarding their symptoms and development.