The 50th anniversary of the discovery of trisomy 21: the past, present, and future of research and treatment of Down syndrome.

Abstract excerpt

Trisomy 21 or Down syndrome is a chromosomal disorder resulting from the presence of all or part of an extra Chromosome 21. It is a common birth defect, the most frequent and most recognizable form of mental retardation, appearing in about 1 of every 700 newborns. Although the syndrome had been described thousands of years before, it was named after John Langdon Down who reported its clinical description in 1866....

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