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Effect of PsPto-pscA ligands on c-di-GMP levels. Fluorescence intensities of strains harboring the c-di-GMP biosensor plasmid pCdrA::gfpS grown in M9 medium supplemented with d-Asp (A), l-Asp (B), and l-Glu (C) were determined. Shown are means and standard errors from three independent experiments. ANOVA was performed, followed by Fisher’s LSD test (*, P < 0.05). A.U., arbitrary units.
