Facts About Down Syndrome

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Facts About Down Syndrome

Named after John Langdon Down, the first physician to identify the syndrome, Down syndrome is the most frequent genetic cause of mild to moderate mental retardation and associated medical problems and occurs in one out of 800 live births, in all races and economic groups. Down syndrome is a chromosomal disorder caused by an error in cell division that results in the presence of an additional third chromosome 21 or "trisomy 21."

This site is a bit technical, but chock full of information. Be sure to scroll all the way to the bottom for a tremendous list of resources.