M Constant-Boy

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Cytogenetic survey of 257 mentally retarded individuals. A cytogenetic inquiry was undertaken among 257 patients with mental retardation of two psychiatric hospitals. 25 patients show chromosomes anomalies (10%). We found: --18 trisomy 21 (Down's syndrome); --3 sexual chromosome anomalies: 47, XYY syndrome; 47, XYY/46, XY mosaïcism; 47, XXY, or Klinefelter(More)
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