title: A case of atypical Down's syndrome with mosaic 46,XX/46,XX-21+t(21q21q).
mesh_terms: D002648:Child; D002675:Child, Preschool; D002903:Chromosomes, Human, 19-20; D002904:Chromosomes, Human, 21-22 and Y; D004314:Down Syndrome / Q000235:genetics*; D005260:Female; D005347:Fibroblasts / Q000648:ultrastructure; D006801:Humans; D007223:Infant; D007621:Karyotyping; D008214:Lymphocytes / Q000648:ultrastructure; D009030:Mosaicism