ScmR influences the production of the main AHLs found in B. thailandensis E264. C8-HSL, 3OHC10-HSL, and 3OHC8-HSL biosynthesis was measured using LC-MS/MS in cultures of wild-type and scmR mutant strains of B. thailandensis E264 during the exponential growth phase (OD600, ∼4.0). The values are means ± SD (error bars) for three replicates. Values that are significantly different are indicated by asterisks (***, P < 0.001; **, P < 0.01; *, P < 0.05).