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(A) Staining of ARs produced by UW136 and U136::pALA8a strains, transformed with plasmid PBpgyrA-arpR, carrying a constitutively expressed arpR gene or the empty plasmid pBBR1MCS-5 as negative control. (B) Quantification of ARs levels produced by the strains of the panel A. The data represent the mean of three independent experiments. Error bars, SD.
