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"New York, Oct 24 : By the age of 40, nearly 100 percent of all individuals with Down syndrome develop changes in the brain associated with Alzheimer`s disease and researchers have now established the link behind the two disorders. Down syndrome is characterized by an extra copy of chromosome 21, .."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.ap7am.com/english-news-3202-why-down-syndrome-leads-to-alzheimers-disease.html>