FIG. 6.

Adaptive responses against H₂O₂ (A) and cumene hydroperoxide (B) killing in S. mutans wild-type strain GS-5 and the ΔahpC mutant. All procedures were performed under anaerobic conditions. (A) Uninduced wild type (open circles) and ΔahpC (open triangles); H₂O₂-induced (60 min of treatment with 10 μM H₂O₂) wild type (closed circular) and ΔahpC (closed triangle). (B) Uninduced wild type (open circles) and ΔahpC (open triangles); cumene hydroperoxide-induced (60 min of treatment with 30 μM cumene hydroperoxide wild type (closed circles) and ΔahpC (closed triangles). Experiments were repeated three times, and the data shown are the means of triplicates.