Quick Facts: Down Syndrome (Trisomy 21) - Merck Manuals Consumer

Down Syndrome (Trisomy 21) - Learn about the causes, symptoms, diagnosis & treatment from the Merck Manuals - Medical Consumer Version.
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About Down Syndrome National Down Syndrome Society (NDSS)

About Down Syndrome National Down Syndrome Society (NDSS)

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Down syndrome: MedlinePlus Genetics

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