title: Pre-ribosomal RNA synthesis in isolated rat-liver nucleoli.
mesh_terms: D000645:Ammonium Sulfate; D000818:Animals; D002458:Cell Fractionation; D002466:Cell Nucleolus / Q000378:metabolism*; D002474:Cell-Free System; D002794:Choline; D012321:DNA-Directed RNA Polymerases / Q000378:metabolism; D008099:Liver / Q000166:cytology / Q000378:metabolism*; D008970:Molecular Weight; D010759:Phosphorus Isotopes; D012335:RNA, Ribosomal / Q000032:analysis / Q000096:biosynthesis*; D051381:Rats; D012293:Rifampin; D014158:Transcription, Genetic; D014461:Ultracentrifugation
chemical_list: D010759:Phosphorus Isotopes; D012335:RNA, Ribosomal; D012321:DNA-Directed RNA Polymerases; D002794:Choline; D000645:Ammonium Sulfate; D012293:Rifampin