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Down Syndrome Answers: What is trisomy 21?
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The best person to answer a question about Down syndrome is a person with Down syndrome. Leah answers this one.
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What is trisomy 21? Trisomy just means triple chromosome. And the twenty-one refers to which chromosome number.
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What is trisomy 21? Trisomy just means triple chromosome. And the twenty-one refers to which chromosome number.