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A mutation in either vqsR or mvaT does not interfere with the ability of serum to repress lasI expression during early phase of growth. (A) PAO1 and PW5352 (vqsR::phoA) were grown in either LB or LB/S to early phase. (B) PAO1 and PAOΔmvaT were grown in either LB or LB/S to early phase. The level of lasI and lasR expression was determined by qRT-PCR analysis. Values represent the means of three independent experiments ± SEM; ***P < 0.001.
