title: A child with a 21-ring chromosome, 45XX,21minus-46,XX,21r investigated with the banding technique.
mesh_terms: D002478:Cells, Cultured; D002869:Chromosome Aberrations; D002904:Chromosomes, Human, 21-22 and Y; D005260:Female; D005347:Fibroblasts / Q000166:cytology; D006801:Humans; D007223:Infant; D007621:Karyotyping; D008214:Lymphocytes / Q000166:cytology; D009030:Mosaicism; D013194:Staining and Labeling