title: Structural analysis of nucleolar precursors of ribosomal ribonucleic acids. II. Polypurine sequences as chemical markers of processing of nucleolar 45 S ribonucleic acid.
mesh_terms: D000818:Animals; D001483:Base Sequence; D006528:Carcinoma, Hepatocellular; D002466:Cell Nucleolus / Q000032:analysis*; D002478:Cells, Cultured; D002499:Centrifugation, Density Gradient; D002850:Chromatography, Gel; D004590:Electrophoresis, Paper; D006863:Hydrogen-Ion Concentration; D006868:Hydrolysis; D008113:Liver Neoplasms; D008297:Male; D009374:Neoplasms, Experimental; D010179:Pancreas / Q000201:enzymology; D010759:Phosphorus Isotopes; D012334:RNA, Neoplasm / Q000032:analysis*; D012335:RNA, Ribosomal / Q000032:analysis*; D051381:Rats; D012260:Ribonucleases
chemical_list: D010759:Phosphorus Isotopes; D012334:RNA, Neoplasm; D012335:RNA, Ribosomal; D012260:Ribonucleases