title: Abnormalities in the sex-chromosome system in school children according to data on Barr bodies.
mesh_terms: D000293:Adolescent; D000367:Age Factors; D000782:Aneuploidy; D002467:Cell Nucleus / Q000648:ultrastructure; D002648:Child; D005260:Female; D006801:Humans; D008297:Male; D008403:Mass Screening / Q000379:methods; D009061:Mouth Mucosa / Q000648:ultrastructure; D012728:Sex Chromatin / Q000032:analysis*; D012729:Sex Chromosome Aberrations / Q000175:diagnosis / Q000453:epidemiology*; D012730:Sex Chromosomes / Q000648:ultrastructure; D012732:Sex Determination Analysis; D012800:Siberia