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The RNAs identified regulate a myriad of biological processes, ranging from metabolism to transfer RNA regulation to toxin-antitoxin (TA) functions. We found that cells lacking Mfd are highly sensitive to toxin overexpression. Finally, we found that Mfd promotes mutagenesis in at least one toxin gene, suggesting that its function in regulating transcription may promote evolution of certain TA systems and other regions containing strong RNA secondary structures. We conclude that Mfd is an RNAP cofactor that is important, and at times crit