Identification of Isochromosome 17 in a Girl with Mental Retardation and Congenital Malformations
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An isochromosome 17 was found in all analyzed cells of a mentally retarded and malformed girl. As the abnormal chromosome displayed a polymorphic distal band also observed in chromosome 17 of the father, it is suggested that the abnormal chromosome is the result of a non sister chromatid interchange at the level of the centromeric region of chromosomes 17 in paternal meiosis.
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