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Chromosomal condition characterized by flat-looking facial features and weak muscle tone in infancy
Down syndrome or Down's syndrome, also known as trisomy 21, is a genetic disorder caused by the presence of all or part of a third copy of chromosome 21. It is usually associated with developmental delays, mild to moderate intellectual disability, and characteristic physical features. There are three types of Down syndrome, the most common being trisomy 21. Mosaic Down syndrome accounts for two pe... Wikipedia