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What Is Mosaic Down Syndrome?



Mosaic Down syndrome is a developmental disability caused by an extra chromosome. The difference is the same as in Down syndrome, except that individuals with Mosaic Down syndrome do not have the extra chromosome on every cell. They have a "mosaic" of affected and uneffected cells. Children with Mosaic Down syndrome may have higher IQs than those with Down syndrome, but many of the health and development issues are the same.


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