FIG. 2.

Anaerobic growth of wild-type B. japonicum (•), nnrR mutant strain 8678 (▪), strain 8678 harboring the vector pRK290 (control) (○), and the nnrR-containing plasmid pRJ8800 (□). Cells were inoculated into YEM medium plus 10 mM KNO₃, and anaerobic growth was followed by monitoring the optical density at 600 nm (OD₆₀₀).