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Acid tolerance assay. Role of malate for the survival of S. mutans wildtype (A) and ΔmleR mutant (B) after acid stress. Diamond, control, cells were incubated in neutral THBY without malate and subjected to pH 3.1 without malate; Circle, cells were incubated in neutral THBY without malate and subjected to pH 3.1 with malate; Triangle, cells were incubated in acidified THBY with malate and subjected to pH 3.1 with malate.
