a) Growth experiments with WT Veillonella and the AtpC (atpC::chl) and AtpD-AtpC (atpDC::chl) deletion strains in SK, SKL, SKN, and SKLN media (n=4 biological replicates). These deletion strains exhibited a phenotype similar to the one seen in the atp::tet strain. Growth rates (μmax) were calculated for each growth curve. b) Transcriptional analysis of the atpA gene in cells growing in SKL, SKN, and SKLN media (n=3 biological replicates). Data represent mean ± SEM, analyzed by one-way ANOVA and Tukey’s HSD test. NS, not significant.