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Low glucose dependence of PlrgA activity during growth in FMC medium. The PlrgA-gfp reporter strain in the S. mutans wild type background was grown in FMC medium, supplemented by 2 (a), 5 (b), 7 (c), and 11 mM (d) glucose. Relative gfp expression (green circle) and OD600 (white diamond) were monitored during growth on a plate reader (see Materials and Methods for details). The results are representative of three independent experiments.
