title: A case of a girl with a 21 ring chromosome.
mesh_terms: D000015:Abnormalities, Multiple / Q000235:genetics*; D000782:Aneuploidy; D002386:Cataract / Q000235:genetics; D002675:Child, Preschool; D002869:Chromosome Aberrations; D002904:Chromosomes, Human, 21-22 and Y; D003394:Craniofacial Dysostosis / Q000235:genetics; D003731:Dental Caries / Q000235:genetics; D005260:Female; D006801:Humans; D008607:Intellectual Disability / Q000235:genetics; D007621:Karyotyping; D008831:Microcephaly / Q000235:genetics; D013194:Staining and Labeling; D013577:Syndrome