title: Three cistrons in bacteriophage Q beta.
mesh_terms: D001435:Bacteriophages / Q000302:isolation & purification*; D004926:Escherichia coli / Q000528:radiation effects; D009154:Mutation; D012316:RNA Nucleotidyltransferases / Q000096:biosynthesis; D012367:RNA, Viral / Q000096:biosynthesis; D011830:Radiation Effects; D014466:Ultraviolet Rays; D014498:Uracil / Q000378:metabolism
chemical_list: D012367:RNA, Viral; D014498:Uracil; D012316:RNA Nucleotidyltransferases