title: The importance of chromosome analysis in Down's syndrome. A case report of a 21-21 translocation.
mesh_terms: D000328:Adult; D002869:Chromosome Aberrations; D002904:Chromosomes, Human, 21-22 and Y; D004314:Down Syndrome / Q000235:genetics*; D005260:Female; D006801:Humans; D007621:Karyotyping; D009030:Mosaicism; D014314:Trisomy