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Serum represses rhlI, rhlA, and pqsA expression during early phase (A) but enhances rhlI, rhlR, rhlA, and pqsA expression during late phase (B) of growth. PAO1 was grown in either LB or LB/S. Samples were collected at early and late phases and the level of gene expression was determined by qRT-PCR. Values represent the means of three independent experiments ± SEM; ***P < 0.001; **P < 0.01.
