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What causes mental retardation and simian crease? 2 possible conditions

See a list of possible causes in order from the most common to the least.


Down Syndrome

Down syndrome is the most common genetic condition in the United States. It causes physical and mental developmental delays and disabilities.

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Aarskog Syndrome

Aarskog syndrome is a very rare genetic disorder caused by a mutation on the X-chromosome that can affect a child's stature, facial features, genitalia, muscles, and bones. It primarily affects males.

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