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Application of fluorescent in situ hybridization for ‘de novo’ anomalies in prenatal diagnosis

Fluorescent in situ Hybridization (FISH) was carried out for three cases of abnormal karyotypes in prenatal studies. Two concerned de novo structural anomalies and the third a marker chromosome. The origin of the extra material could be defined in all three cases, which gives a better insight into the relationship between genotype and phenotype and makes more adequate genetic counselling possible.