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Results 1 - 1 of 1 for "48,XYYY" syndrome
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  1. Y chromosome 
    ... of two extra Y chromosomes is written as 48,XYYY. The extra genetic material in these cases can ... R, Hagerman R. A new look at XXYY syndrome: medical and psychological features. Am J Med Genet ...
    https://medlineplus.gov/genetics/chromosome/y - Genetics