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β-Galactosidase activity of PPA3427-lacZ fusion in PAO1 and ΔxcpQ genetic backgrounds. (A) The ΔxcpQ mutant showed a negligible PA3727-lacZ expression in the presence of OA. (B) The ΔxcpQ mutant showed the same level of expression as PAO1 when induced with 7,10-DiHOME.
