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Role of GadX in enhanced acid resistance by rpoS-activating sRNAs. Expression of each rpoS-activating sRNA was induced with 1 mmol/L IPTG in gadX mutant cells, and exponentially growing cells exposed to pH 2.0. Acid resistance was evaluated based on the colony-forming abilities of serial 10-fold dilutions of the cultures. The results are representative of at least three independent experiments.
