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XXY - Klinefelter Syndrome

Klinefelter Syndrome is a common chromosomal variation. It is also known as 47,XXY, XXY Syndrome or XXY. On this site we use the terms interchangeably. In most individuals there are 46 chromosomes

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XYY Syndrome

XYY syndrome also known as Jacob’s Syndrome and YY Syndrome is a rare chromosomal disorder that affects 1:1000 males. People normally have 46 chromosomes in each cell. Two of the 46 chromosomes,

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