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Fermentation end products of S. mutans wild-type strain GS-5 and the ΔahpC, Δnox-1, and Δnox-2 mutants after 4 h of aeration in TYG (A) and TYM (B) media except that Δnox-2 was omitted. After 4 h of exposure to air, the cells were harvested and the cell-free culture media were assayed (see Materials and Methods).
