Down Syndrome Sign Video
Upload On Tue Aug 07 2012 by ASL STEM
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Definition
A congenital syndrome including mental disability, caused by the cells in a person's body having an extra chromosome 21; also called trisomy 21.
Source: Hickman, C.P., et al. 2011. Integrated Principles of Zoology. Fifteenth Edition. McGraw-Hill Higher Education.
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