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27 November 2010
- 22:0322:03, 27 November 2010 diff hist +281 Down's syndrome No edit summary
- 21:5921:59, 27 November 2010 diff hist +710 N Down's syndrome Created page with 'Down syndrome or ''trisomy 21'' is a trisomic condition in which the zygote gets (inherit) an extra chromosome 21 for a total of 47 chromosomes. it happens in about 1 in 80…'