Internal Promoter P2 of the Histidine Operon of Salmonella typhimurium1

Bert Ely, Zygmunt Ciesla
1974 Journal of Bacteriology  
The histidine operon internal promoter P2 allows initiation of transcription at a rate up to one-third that of the wild-type his operon.
doi:10.1128/jb.120.2.984-986.1974 fatcat:vx6qra2r7rbbnntsi6nhepgtna