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Impact of AI-2 on bacterial growth. D39, D39ΔluxS, and D39luxS+ were cultured in C+Y-Glc (A) or C+Y-Gal (B), and growth was monitored by measuring the OD600. (C) The growth of D39 and D39ΔluxS in C+Y-Gal supplemented with 0, 4, 10, or 200 μM AI-2 was monitored. Data are mean values of triplicate cultures.
