Ribosomal precursor particles in the HeLa cell nucleus.
D002247:Carbon Isotopes; D002467:Cell Nucleus / Q000378:metabolism*; D002499:Centrifugation, Density Gradient; D003593:Cytoplasm / Q000378:metabolism; D006367:HeLa Cells; D008274:Magnesium / Q000494:pharmacology; D012270:Ribosomes / Q000378:metabolism*; D014316:Tritium
D002247:Carbon Isotopes; D014316:Tritium; D008274:Magnesium