title: Constitutive heterochromatin patterns of G-group chromosomes in Down's syndrome.
mesh_terms: D002904:Chromosomes, Human, 21-22 and Y; D004314:Down Syndrome / Q000235:genetics*; D006570:Heterochromatin / Q000032:analysis*; D006801:Humans; D007621:Karyotyping; D008297:Male
chemical_list: D006570:Heterochromatin