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contains a full extra copy of chromosome 13 (a disorder known as trisomy 13 or trisomy D or T13), or because each cell contains an extra partial copy of the chromosome, or because there are two different lines of cells--one healthy with the correct number of chromosomes 13 and one that contains an extra copy of the chromosome--mosaic Patau syndrome. Full trisomy 13 is caused by nondisjunction of chromosomes during meiosis;

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