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Quantification of promoter strengths for the two different growth conditions formate or H2/CO2, measured after the culture has reached OD600 = ca. 0.5. The promoters mcr_JJ, mcrR_JJ, and fla_JJ are from M. maripaludis JJ. The remaining promoters are from M. vannielii SB. Error bars represent the standard deviation (n = 3). The activity of the hdrC1 promoter in H2/CO2 medium and the nif promoter in formate and H2/CO2 medium cannot be detected. *P < 0.05; **P < 0.01; ***P < 0.001.
