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The influence of QSIs on the quorum sensing (QS) genes. qRT-PCR studies revealed that lasR and rhlR were inhibited significantly when compared to lasI and rhlI (n = 3). The level of QS-regulated gene expression was suppressed by QSIs especially by butein (B) (100 μM) when compared to the untreated control (C), sappanol (S) and C30. Data shown as mean ± SD of triplicates ** p < 0.01 vs. control.
