Fig. 4.

B. fragilis can grow with transferrin as the sole source of carbon/energy. Growth curves are shown for WT or ∆don strains in DM with different carbon/energy sources. An overnight inoculum of 2% was used, and the OD₅₅₀ was measured at specific time intervals. Dashed lines represent ∆don and solid lines represent WT. Squares represent glucose (0.4%), triangles human transferrin (25 mg/mL), and circles BSA (25 mg/mL). Each growth curve represents two biological repeats with the SDs shown.