Down syndrome :  trisomy 21, is a genetic disorder caused by the presence of all or part of a third copy of chromosome 21.It is typically associated with physical growth delays, characteristic facial features and mild to moderate intellectual disability.

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Abby Abelson, MD, FACR

Abby G. Abelson, MD, FACR, is Chair, Department of Rheumatic and Immunologic Diseases, the Education