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Relative expression of the pmrCAB genes in the colistin-resistant and -susceptible strains (expression level of pmrCAB in the ColS strains equal to 1). (A) Ab15/132 ColR compared with Ab15/133 ColS; (B) ATCC 19606 ColR compared with ATCC 19606 ColS; (C) ABRIM ColR compared with ABRIM ColS; (D) means for five clinical ColR strains compared with those for five clinical ColS strains. Values are the means and the standard deviations from three independent experiments.
