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Resistance to toxic compounds. The growth of E. coli JM109 expressing CGmdr (▾), MSmdr (▴), HSmdr (•), and the control (▪) in the presence of the indicated concentrations of chloramphenicol (A) or ofloxacin (B). Bacterial growth after 8 h is shown relative to growth without antibiotics. The experiment was repeated three times. One representative experiment is shown.
