title: Letter: Ribosomal DNA connectives between human acrocentric chromosomes.
mesh_terms: D001345:Autoradiography; D002455:Cell Division; D002901:Chromosomes, Human, 13-15; D002904:Chromosomes, Human, 21-22 and Y; D003582:Cytogenetics; D004247:DNA; D006801:Humans; D006824:Hybridization, Genetic; D007621:Karyotyping; D012335:RNA, Ribosomal; D012270:Ribosomes; D014316:Tritium
chemical_list: D012335:RNA, Ribosomal; D014316:Tritium; D004247:DNA