title: Amber mutations of Escherichia coli RNA polymerase.
mesh_terms: D004794:Enzyme Repression; D004926:Escherichia coli / Q000201:enzymology* / Q000254:growth & development; D005796:Genes; D005815:Genetic Code / Q000187:drug effects; D008967:Molecular Biology; D009154:Mutation / Q000187:drug effects; D012316:RNA Nucleotidyltransferases / Q000096:biosynthesis / Q000302:isolation & purification*; D012293:Rifampin / Q000494:pharmacology
chemical_list: D012316:RNA Nucleotidyltransferases; D012293:Rifampin