title: Localization in nucleolar ribonucleoproteins of the three molecular species constituting the "45S fraction" ribosomal RNA.
mesh_terms: D000818:Animals; D002247:Carbon Isotopes; D002466:Cell Nucleolus / Q000032:analysis* / Q000378:metabolism; D002478:Cells, Cultured; D002499:Centrifugation, Density Gradient; D004591:Electrophoresis, Polyacrylamide Gel; D007942:Leukemia, Experimental; D009698:Nucleoproteins / Q000032:analysis* / Q000302:isolation & purification; D012335:RNA, Ribosomal / Q000032:analysis* / Q000302:isolation & purification; D013395:Sucrose; D014316:Tritium; D014529:Uridine / Q000378:metabolism
chemical_list: D002247:Carbon Isotopes; D009698:Nucleoproteins; D012335:RNA, Ribosomal; D014316:Tritium; D013395:Sucrose; D014529:Uridine