title: Familial Down's syndrome. A cytogenetical and genealogical study of twenty-two families.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D002675:Child, Preschool; D002869:Chromosome Aberrations / Q000235:genetics*; D025063:Chromosome Disorders; D004314:Down Syndrome / Q000235:genetics*; D005260:Female; D006801:Humans; D007223:Infant; D007621:Karyotyping; D008214:Lymphocytes / Q000166:cytology; D008297:Male; D008875:Middle Aged; D012728:Sex Chromatin