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from Wikipedia, the free encyclopedia

Down syndrome

Down syndrome (US, Canada and other countries) or Down's syndrome (UK and other countries) encompasses a number of chromosomal abnormalities, of which trisomy 21 (an aneuploid) is the most common, causing highly variable degrees of learning difficulties as well as physical disabilities.

Note:   The above text is excerpted from the Wikipedia article "Down syndrome", which has been released under the GNU Free Documentation License.
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September 28, 2016

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updated 12:56 pm ET