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Complementation of ΔmexE strain AB3018. Cells of wild-type strain A348 with pYW15c and strain AB3018 with pYW15c or pAB302 (expressing mexE from the PN25 promoter of pYW15c) were grown in ABI medium supplemented with chloramphenicol as indicated. OD600 of cultures was measured after 20 h of incubation. Error bars are SD; n = 3.
