title: Escherichia coli tryptophan operon leader mutations, which relieve transcription termination, are cis-dominant to trp leader mutations, which increase transcription termination.
mesh_terms: D004926:Escherichia coli; D009154:Mutation; D009876:Operon; D012313:RNA / Q000378:metabolism*; D014158:Transcription, Genetic; D014364:Tryptophan / Q000378:metabolism*
chemical_list: D012313:RNA; D014364:Tryptophan