[Molecular analysis of the parental origin of trisomy in two families with two children having regular trisomy 21].


In order to investigate the parental origin of the trisomy in two families with two free trisomy 21 affected siblings, cytogenetic and molecular analyses were performed. In each case the parental origin was the same for both patients. In one of the families an association between the concordance of the paternal origin of the trisomy and the existence of… (More)


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