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Iron-induced killing of various plaque bacteria. (A to C) S. gordonii, S. rattus FA-1, and S. sanguis NCTC10904, respectively (□, control cells; ▵ and ▴, cells exposed to 10 mM Fe2+ or Fe3+, respectively). (D) A. viscosus OMZ105E (□, control cells; ▵ and +, cells exposed to 10 or 20 mM Fe2+, respectively) and A. naeslundii WVU45 (▪, cells exposed to 10 mM Fe2+).
