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Persistence experiment using a mixed inoculum containing wild-type S. gordonii and a nonpolar QueA-deficient strain. The proportions of the wild type (▴ and ▪) and the QueA-deficient strain (⧫ and •) in TY medium containing 0.2% glucose (⧫ and ▴) and TY medium containing 0.2% galactose (• and ▪) with 10 mM arginine are shown. The values are the means and standard deviations (error bars) of three independent experiments.
