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Growth behavior of B. subtilis 1012 (●), the hemN mutant HZ01 (⧫), the hemZ mutant HZ02 (▾), the hemY mutant ARB11 (▴), the hemN hemZ double mutant HZ03 (■), and the hemN hemZ hemY triple mutant ARB10 (○) in minimal medium under aerobic (A) and anaerobic nitrate ammonifying (B) conditions. OD, optical density.
