title: Characterization of ribosomal precursor particles from HeLa cell nucleoli.
mesh_terms: D002247:Carbon Isotopes; D002466:Cell Nucleolus / Q000378:metabolism; D002499:Centrifugation, Density Gradient; D003593:Cytoplasm / Q000378:metabolism; D004591:Electrophoresis, Polyacrylamide Gel; D006367:HeLa Cells / Q000032:analysis / Q000166:cytology; D007553:Isotope Labeling; D007930:Leucine / Q000378:metabolism; D008970:Molecular Weight; D009363:Neoplasm Proteins / Q000032:analysis / Q000378:metabolism; D009698:Nucleoproteins / Q000032:analysis / Q000378:metabolism; D011485:Protein Binding; D012334:RNA, Neoplasm / Q000032:analysis; D012335:RNA, Ribosomal / Q000378:metabolism; D012270:Ribosomes; D013997:Time Factors; D014316:Tritium; D014529:Uridine / Q000378:metabolism
chemical_list: D002247:Carbon Isotopes; D009363:Neoplasm Proteins; D009698:Nucleoproteins; D012334:RNA, Neoplasm; D012335:RNA, Ribosomal; D014316:Tritium; D007930:Leucine; D014529:Uridine