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Down's Syndrome or Trisomy 21 is the most common chromosomal abnormality occurring in human leading to mental retardation and stunted growth.It is considered as a genetic disorder with a defect in all or a part of a third copy of chromosome 21.This article highlights varied clinical presentation of 18 year old patient with Down's Syndrome.
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Mathew et al. (2017) studied this question.
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