title: 1, 9, and 16 C-band heteromorphisms in parents of Down's syndrome patients: distribution and etiological significance.
mesh_terms: D002900:Chromosomes, Human, 1-3; D002902:Chromosomes, Human, 16-18; D002906:Chromosomes, Human, 6-12 and X; D004314:Down Syndrome / Q000235:genetics*; D005260:Female; D006570:Heterochromatin; D006801:Humans; D008297:Male
chemical_list: D006570:Heterochromatin