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Competition between AS and chloramphenicol for the MexE/MexF/AmeC efflux pump. (A and B) A348 (A) or AB3018 (B) cells grown in ABI medium plus or minus 500 μM AS at various chloramphenicol concentrations. OD600 measured after 20 h incubation. (C) A348 grown with 0, 30, 100, or 300 μM AS and various chloramphenicol concentrations. OD600 was measured after 20 h. Error bars are SD; n = 3.
