title: Repetitive and non-repetitive sequence in sea urchin heterogeneous nuclear RNA.
mesh_terms: D000818:Animals; D001483:Base Sequence; D002467:Cell Nucleus / Q000032:analysis*; D002499:Centrifugation, Density Gradient; D002845:Chromatography; D004247:DNA; D008970:Molecular Weight; D009693:Nucleic Acid Hybridization; D009711:Nucleotides / Q000032:analysis*; D012313:RNA / Q000032:analysis*; D012617:Sea Urchins; D014158:Transcription, Genetic; D014316:Tritium; D014529:Uridine / Q000378:metabolism
chemical_list: D009711:Nucleotides; D014316:Tritium; D012313:RNA; D004247:DNA; D014529:Uridine