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Suppressors lower σE activation of the ΔbamB ΔbamE double mutant background. σE signaling was assayed by measurement of β-galactosidase activity driven from the rpoHP3 promoter. All strains were grown in minimal glucose at 30°C, the permissive condition of the ΔbamB ΔbamE double mutant. *, P value < 0.05 as determined by t test. The bamAF494L and ΔrcsF suppressors lower σE activation of the ΔbamB ΔbamE double mutant.
