Expression ratios of gene clusters encoding for hydrogenases and assembly genes in <i>M. smegmatis</i> at different growth rates and oxygen concentrations.

Expression ratios with a p-value<0.05 are indicated with bold numbers. 1Gene expression ratios of slow growing (0.01 h−1) versus fast growing (0.15 h−1) chemostat cultures at 50% oxygen saturation. 2Gene expression ratios of slow growing (0.01 h−1, 50% oxygen saturation) versus slow growing cultures at either 2.5% or 0.6% oxygen saturation.