Stock Photo - Illustration of the various trisomies highlighted on a genetic map. Each person has 22 pairs of chromosomes and two unique sex chromosomes. Seen here, the X and Y of a little girl. Trisomy concerns chromosomes 13, 18 and 21, who have three identical chromosomes instead of a pair.

Stock Photo: Illustration of the various trisomies highlighted on a genetic map. Each person has 22 pairs of chromosomes and two unique sex chromosomes.

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