Figure 1. Performance of the P_gelE and P_fsrB promoters during the growth of E. faecalis SL11 (MMH594::pREG696luxP_gelE, in black) and SL13 (MMH594::pREG696luxP_fsrB, in grey) in GM17 medium.

The dotted lines indicate the promoter activity expressed as bioluminescence (photons/s) divided by the optical density (OD) at 620 nm, and growth is indicated by continuous lines and was measured as OD₆₂₀. The values shown represent the averages of the results of three biological replicates ± standard deviation.