Ely B, Ciesla Z
J Bacteriol. 1974 Nov;120(2):984-6. doi: 10.1128/jb.120.2.984-986.1974.
The histidine operon internal promoter P2 allows initiation of transcription at a rate up to one-third that of the wild-type his operon.
组氨酸操纵子内部启动子P2使得转录起始速率最高可达野生型组氨酸操纵子转录起始速率的三分之一。