title: Analysis of cetacean DNA. II. Localization of 18S and 28S ribosomal RNA cistrons in a heavy DNA component.
mesh_terms: D000818:Animals; D002499:Centrifugation, Density Gradient; D002591:Cetacea / Q000235:genetics*; D004247:DNA / Q000032:analysis*; D007553:Isotope Labeling; D009693:Nucleic Acid Hybridization; D012335:RNA, Ribosomal / Q000032:analysis / Q000235:genetics*; D013045:Species Specificity; D014461:Ultracentrifugation
chemical_list: D012335:RNA, Ribosomal; D004247:DNA