title: Letter: Rapid diagnosis of Down's syndrome.
mesh_terms: D001853:Bone Marrow / Q000737:chemistry; D001854:Bone Marrow Cells; D002904:Chromosomes, Human, 21-22 and Y; D004314:Down Syndrome / Q000175:diagnosis* / Q000235:genetics; D006801:Humans; D007231:Infant, Newborn; D007621:Karyotyping