title: Internal promoter P2 of the histidine operon of Salmonella typhimurium.
abstract: The histidine operon internal promoter P2 allows initiation of transcription at a rate up to one-third that of the wild-type his operon.
mesh_terms: D006639:Histidine; D009154:Mutation; D009876:Operon; D012486:Salmonella typhimurium / Q000201:enzymology; D014158:Transcription, Genetic
chemical_list: D006639:Histidine