Down Syndrome

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Down Syndrome
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Added: 26-02-2010
Runtime: 3m 25s
Views: 1978
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Song: Era - Hymne Down syndrome, Down's syndrome, or trisomy 21 is a chromosomal disorder caused by the presence of all or part of an extra 21st chromosome. It is named after John Langdon Down, the British doctor who described the syndrome in 1866. The disorder was identified as a chromosome 21 trisomy by Jérôme Lejeune in 1959. The condition is characterized by a combination of major and minor differences in structure. Often Down syndrome is associated with some impairment of cognitive ability and physical growth as well as facial appearance. Down syndrome can be identified during pregnancy or at birth. Pictures: Google & Yahoo Informations: Wikipedia & http://www.nlm.nih.gov/medlineplus/ency/article/000997.htm


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