title: Identification of a small subfraction of hnRNA with the characteristics of a precursor to mRNA.
mesh_terms: D000227:Adenine Nucleotides / Q000032:analysis; D000241:Adenosine; D000645:Ammonium Sulfate; D002458:Cell Fractionation; D002467:Cell Nucleus / Q000032:analysis*; D002499:Centrifugation, Density Gradient; D002843:Chromatin / Q000032:analysis; D003609:Dactinomycin / Q000494:pharmacology; D006367:HeLa Cells / Q000032:analysis* / Q000648:ultrastructure; D006801:Humans; D011119:Polynucleotides / Q000032:analysis; D012333:RNA, Messenger / Q000032:analysis*; D012334:RNA, Neoplasm / Q000032:analysis* / Q000302:isolation & purification; D014158:Transcription, Genetic; D014316:Tritium; D014529:Uridine
chemical_list: D000227:Adenine Nucleotides; D002843:Chromatin; D011119:Polynucleotides; D012333:RNA, Messenger; D012334:RNA, Neoplasm; D014316:Tritium; D003609:Dactinomycin; D000241:Adenosine; D000645:Ammonium Sulfate; D014529:Uridine