Down's syndrome (DS) is caused by the presence of an extra copy of chromosome Hentai, Comics, Anime, Cartoons links 21

(Hsa21) and is the leading genetic cause of mental retardation in the human ... Scientists believe they have disproved a 30-year-old notion of what causes Down's

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be a critical factor ... National Down
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Down Syndrome Society ... chromosomal disorder associated with fragile Mike's Julia Ormondsite on end of X chromosome; second most common cause