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Schematic representation of the acrAB−acrR region in HUE1, group A mutants, and group B mutants. (A) Escherichia coli K12 MG1655 (accession no U00096). (B) HUE1 and HUE1A-Curoqxqnr (group A). (C) HUE1B-Curoqxqnr (group B). aa., Amino acids. *Position of primer pairs (acrART-F and acrART-R) used in RT-PCR (corresponding to amino acids 272–294 in AcrA).
