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Relative growth rates of mutant strains under aerobic conditions (A; sparged with 30% O2–1% CO2–69% N2), semiaerobic conditions (B; sparged with 2% O2–1% CO2–97% N2), and phototrophic conditions (C; sparged with 5% CO2–95% N2). ○, wild type; ●, rdxB; □, rdxH; ■, rdxI; ▵, rdxS; ▴, ccoN. OD660, optical density at 660 nm.
