Poly-X Klinefelter syndrome: Overview

In very rare cases, males might have two or more extra X chromosomes in their cells, for instance XXXY or XXXXY, or an extra Y, such as XXYY. This is called poly-X Klinefelter syndrome, and it causes more severe symptoms.1

Source: NICHD (NIH)1

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Poly-X Klinefelter syndrome: A rare sex chromosome abnormality in which a male child has 2 extra X chromosomes.2

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References

  1. Source: NICHD (NIH): nichd.nih.gov/ health/ topics/ klinefelter/ conditioninfo/ Pages/ Default.aspx
  2. Source: NCI Thesaurus

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