BMJ Publishing Group, Journal of Medical Genetics, 5(24), p. 303-305, 1987
DOI: 10.1136/jmg.24.5.303
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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.