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National Institute of Child Health & Human Development: Down Syndrome
Fact sheet about Down syndrome, a "set of mental and physical symptoms that result from having an extra copy of Chromosome 21." Discusses signs and symptoms of Down syndrome, treatment, and who is at risk. Includes links to related information, including a basic explanation of chromosomes. From the National Institutes of Health.
http://www.nichd.nih.gov/health/topics/Down_Syndrome.cfm
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