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RyhB represses the expression of S. dysenteriae virB. Real-time PCR analysis of virB mRNA, virF mRNA, and sodB mRNA levels in S. dysenteriae ryhB mutant strain ND100ryhB carrying pryhB was performed. ND100ryhB (pryhB) was cultured in the presence of the indicated concentrations of IPTG. All values were normalized to the level of rrsA mRNA in each sample, and the results are expressed relative to the value obtained following growth in the absence of IPTG.
