title: Biochemical and cytogenetic studies on the nucleolus organizing regions (NOR) of man. I. Comparison of trisomy 21 with balanced translocations t(DqGq).
mesh_terms: D002466:Cell Nucleolus; D002869:Chromosome Aberrations; D002904:Chromosomes, Human, 21-22 and Y; D004247:DNA; D005260:Female; D005347:Fibroblasts; D005815:Genetic Code; D006367:HeLa Cells; D006801:Humans; D006824:Hybridization, Genetic; D007231:Infant, Newborn; D007962:Leukocytes; D008297:Male; D012335:RNA, Ribosomal; D014314:Trisomy
chemical_list: D012335:RNA, Ribosomal; D004247:DNA