Regulation of the expression of the histidine operon in Salmonella typhimurium

@article{Kasai1974RegulationOT,
  title={Regulation of the expression of the histidine operon in Salmonella typhimurium},
  author={Takashi Kasai},
  journal={Nature},
  year={1974},
  volume={249},
  pages={523-527}
}
A positive factor enhancing the expression of this operon binds at the promoter, but exerts its effect downstream on a DNA region which acts as an attenuator of transcription.