title: A transcription-initiating mutation within a structural gene of the tryptophan operon.
mesh_terms: D002874:Chromosome Mapping; D004247:DNA / Q000378:metabolism; D004926:Escherichia coli; D005796:Genes; D005815:Genetic Code; D008967:Molecular Biology; D009154:Mutation; D009876:Operon; D012333:RNA, Messenger / Q000378:metabolism; D014161:Transduction, Genetic; D014364:Tryptophan
chemical_list: D012333:RNA, Messenger; D014364:Tryptophan; D004247:DNA