title: Letter: Paternal origin of the extra chromosome in Down's syndrome.
mesh_terms: D000328:Adult; D002675:Child, Preschool; D002904:Chromosomes, Human, 21-22 and Y; D004314:Down Syndrome / Q000097:blood / Q000235:genetics*; D005260:Female; D005456:Fluorescent Dyes; D006801:Humans; D007621:Karyotyping; D008214:Lymphocytes / Q000166:cytology; D008297:Male; D008423:Maternal Age; D009030:Mosaicism; D014314:Trisomy
chemical_list: D005456:Fluorescent Dyes