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Colistin accumulation is enhanced in the presence of ursolic acid similar to CCCP. Mid log cells were incubated with colistin-dansyl chloride alone and along with ursolic acid (UR)/CCCP for 3 h and imaged using a fluorescent microscope. a Untreated, b colistin, c colistin + UR, d dansyl chloride, e colistin-dansyl chloride, f colistin-dansyl chloride + UR, g colistin-dansylchloride + CCCP
