URL details: www.ndss.org/about-down-syndrome/down-syndrome/

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URL title: About Down Syndrome | National Down Syndrome Society (NDSS)
URL description: In every cell in the human body there is a nucleus, where genetic material is stored in genes. Genes carry the codes responsible for all of our inherited traits and are grouped along rod-like structures called chromosomes. Typically, the nucleus of each cell contains 23 pairs of chromosomes, half of which are inherited from each parent. Down syndrome occurs when an individual has a full or partial extra copy of chromosome 21.
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