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Duplication 9p due to unequal sister chromatid exchange.
  1. T Mattina,
  2. G Sorge,
  3. G Milone,
  4. R Garozzo,
  5. L Conti


    A case of trisomy 9p syndrome is reported. The karyotype showed a tandem duplication of the short arm and of the inverted heterochromatic block of chromosome 9. Unequal sister chromatid exchange seems to be the only possible cause of this finding.

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