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child:genetic-disorders:down-syndrome-trisomy-21 [April 2019]
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child:genetic-disorders:down-syndrome-trisomy-21 [May 2019] (current)
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 {{INLINETOC}} {{INLINETOC}}
 ===== Primer ===== ===== Primer =====
-**Down Syndrome** (Trisomy 21) is the most common identifiable genetic cause of [[child:​intellectual-disability:home|intellectual disability]]. It is due to the presence of all or part of a third copy of chromosome 21. Individuals with Down syndrome have a characteristic facial appearance and hypotonia in infancy. About half are born with a heart defect.+**Down Syndrome** (Trisomy 21) is the most common identifiable genetic cause of [[child:​intellectual-disability|intellectual disability]]. It is due to the presence of all or part of a third copy of chromosome 21. Individuals with Down syndrome have a characteristic facial appearance and hypotonia in infancy. About half are born with a heart defect.
  
 == Epidemiology == == Epidemiology ==