title: A new regulatory gene for the tryptophan operon of Escherichia coli.
mesh_terms: D002874:Chromosome Mapping; D002876:Chromosomes, Bacterial; D004794:Enzyme Repression; D004926:Escherichia coli / Q000378:metabolism*; D005809:Genes, Regulator; D008025:Ligases / Q000378:metabolism; D008967:Molecular Biology; D009154:Mutation; D014364:Tryptophan / Q000378:metabolism*
chemical_list: D014364:Tryptophan; D008025:Ligases