Letter X

XXXXX syndrome

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A chromosome disorder in females, caused by the presence of five X chromosomes rather than the usual two.

It is characterized by decreased intelligence (IQ 20 to 75) and multiple malformations including upward-slanting palpebral fissures (eyeslits), heart defect, and small hands with incurving fifth fingers.

It is the most severe extra-X syndrome in females.

Also known as the penta-X syndrome

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