title: Synthesis of rRNA in sea urchin embryos. IV. Maturation of rRNA precursor.
mesh_terms: D000818:Animals; D002466:Cell Nucleolus / Q000378:metabolism; D002499:Centrifugation, Density Gradient; D004447:Echinodermata / Q000196:embryology / Q000378:metabolism*; D007700:Kinetics; D008715:Methionine / Q000378:metabolism; D008745:Methylation; D009711:Nucleotides / Q000032:analysis; D010759:Phosphorus Isotopes; D012313:RNA / Q000096:biosynthesis*; D012335:RNA, Ribosomal / Q000032:analysis / Q000096:biosynthesis; D012270:Ribosomes / Q000378:metabolism*; D014316:Tritium; D014529:Uridine / Q000378:metabolism
chemical_list: D009711:Nucleotides; D010759:Phosphorus Isotopes; D012335:RNA, Ribosomal; D014316:Tritium; D012313:RNA; D008715:Methionine; D014529:Uridine