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Quantitative RT-PCR of selected luxS/AI-2 regulated genes. Growth conditions of cultures in which relative transcription levels were determined were the same as in the microarray experiments. *, p < 0.05, **, p < 0.01, ***, p < 0.001. Comparisons are vs. wild type for ΔluxS and vs. ΔluxS for ΔluxS + AI-2.
