https://thefocusfoundation.org/x-and-y-chromosomal-variations/xxy/

The Focus Foundation efforts focus on X and Y Chromosomal Variations, such as 47, XXY (Klinefelter syndrome), 47, XYY (Jacob’s syndrome), 47, XXX (Triple X), 48, XXXX (Tetrasomy X), 48, XXXY, and 49, XXXY. They provide the Best Klinefelter Syndrome Treatment. For more information visit thefocusfoundation.org.

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