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Down Syndrome Index

Featured: Down Syndrome Main Article
Down syndrome is a chromosomal disorder that results in the presence of an additional third chromosome 21, also referred to as trisomy 21. Down syndrome causes mental retardation. Diagnostic tests for Down syndrome include amniocentesis, chorionic villus sampling, and percutaneous umbilical blood sampling. There is no cure for Down syndrome.

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Terms related to Down Syndrome:

  • Mongolism (obsolete term)
  • Trisomy 21


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Special Report: Embracing Fragile X Special Report: Embracing Fragile X
Fragile X Syndrome is a genetic disorder which causes a wide range of reasoning problems from mild learning disabilities to severe mental retardation. Learn how genetic researchers and families are using their hearts and minds to embrace Fragile X. See more WebMD Videos »










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