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Kinetics of membrane permeabilization of all A. baumannii strains induced by the addition of different concentrations of colistin (Col), either when used alone or in combination with Esc(1-21) at its MICFIC. Samples were incubated with 1 μM Sytox Green in phosphate buffer saline as described in the Materials and Methods section, and changes in fluorescence were monitored. Controls were microbial cells with vehicle. Values correspond to one representative experiment of three.
