Transcriptional analysis of B. vietnamiensis quorum-sensing genes. All values are means ± standard deviations of the results of triplicate assays. ▪, G4; ○, G4 bviR mutant (RMT-14); □, G4cepR (PC259); ▴, PC259; ▵, PC259cepR. (A) Effect of BviR on bviI expression (bviI-luxCDABE, pRM465). (B) Effect of CepR on cepI expression (cepI-luxCDABE, pRM463). (C) Effect of CepR on cepR expression (cepR-luxCDABE, pRM462). (D) Effect of CepR on cepR expression (cepR-luxCDABE, pRM452). The expression of pRM452 was significantly greater in PC259cepR from 3 to 12 h (P < 0.05, t test). (E) Effect of CepR on cepI expression (cepI-luxCDABE, pRM453). (F) Effect of CepR on bviI expression (bviI-luxCDABE, pRM465). CPS, counts per second.