Sex chromatin survey among mentally retarded children in Japan.
D000293:Adolescent; D000328:Adult; D002648:Child; D002675:Child, Preschool; D002869:Chromosome Aberrations; D005260:Female; D006306:Health Surveys; D006801:Humans; D007231:Infant, Newborn; D008607:Intellectual Disability / Q000235:genetics*; D007360:Intelligence; D007564:Japan; D007621:Karyotyping; D007962:Leukocytes / Q000166:cytology; D008297:Male; D009061:Mouth Mucosa / Q000166:cytology; D012728:Sex Chromatin; D012737:Sex Factors