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- About Down Syndrome (National Down Syndrome Society)Down Syndrome/Start Here ... Down Syndrome ... National Down Syndrome Society ... In every cell in the human body there is a nucleus, where genetic material is stored ...
- Triple X Syndrome: Symptoms and Causes (Mayo Foundation for Medical Education and Research)Genetic Disorders/Specifics ... Genetic Disorders ... Mayo Foundation for Medical Education and Research
- About Down Syndrome (National Human Genome Research Institute)Down syndrome is a chromosomal condition related to chromosome 21. ... Down Syndrome/Genetics ... Down Syndrome ... National Human Genome Research Institute ... From the ...
- What Causes Down Syndrome? (Eunice Kennedy Shriver National Institute of Child Health and Human Development)Down syndrome is caused by a random error in cell division that results in the presence of an extra copy of chromosome 21. ... Down Syndrome/Related Issues ...
- Facts about Down Syndrome (Centers for Disease Control and Prevention)Down Syndrome/Start Here ... Down Syndrome ... Centers for Disease Control and Prevention ... Down syndrome is a condition in which a person has an extra chromosome. ...