| http://www.w3.org/ns/prov#value | - In the case of Down syndrome, many receive incomplete and outdated data.The most recent ACOG parent education brochure entitled Genetic Disorders, published in 2005, defines Down syndrome as a genetic disorder resulting from an extra copy of the 21st chromosome in which mental retardation, abnormal features of the face, and medical problems such as heart defects occur.
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