Reverse transcription-qPCR comparisons of transcript levels of covRSm and CovRSm-regulated genes (lysM, wapE, epsC, gbpC, gbpB, gtfB, and gtfC) in blood (n = 4) and oral (n = 5) strains of S. mutans. The gtfD gene, which is not regulated by CovRSm, was tested as a control. Asterisks indicate significant differences in mean levels of transcripts between groups (P < 0.05 as determined by analysis of variance with Tukey's post hoc test).