title: A new class of small nuclear RNA molecules synthesized by a type I RNA polymerase in HeLa cells.
mesh_terms: D000546:Amanitins / Q000494:pharmacology; D002467:Cell Nucleus / Q000378:metabolism*; D002474:Cell-Free System; D012321:DNA-Directed RNA Polymerases / Q000378:metabolism*; D003609:Dactinomycin / Q000494:pharmacology; D006367:HeLa Cells / Q000378:metabolism; D008970:Molecular Weight; D012318:RNA Polymerase I / Q000378:metabolism*; D012334:RNA, Neoplasm / Q000096:biosynthesis*
chemical_list: D000546:Amanitins; D012334:RNA, Neoplasm; D003609:Dactinomycin; D012321:DNA-Directed RNA Polymerases; D012318:RNA Polymerase I