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Down's syndrome karyotype 47,XX,+21

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Credit: Down's syndrome karyotype 47,XX,+21. Wessex Reg. Genetics Centre. Attribution 4.0 International (CC BY 4.0)

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Karyotype of Down's syndrome (trisomy 21), in which an extra copy of chromosome 21 is present. This karyotype is of a female human.

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