title: Identification of human G-group and Y chromosomes. Demonstration of constitutive heterochromatin by modified DNA-RNA hybridization technique.
mesh_terms: D002904:Chromosomes, Human, 21-22 and Y; D004247:DNA; D004314:Down Syndrome / Q000235:genetics; D006570:Heterochromatin; D006801:Humans; D007621:Karyotyping; D008297:Male; D008722:Methods; D009693:Nucleic Acid Hybridization; D012313:RNA; D012730:Sex Chromosomes; D014314:Trisomy
chemical_list: D006570:Heterochromatin; D012313:RNA; D004247:DNA