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Specific growth rate constants (k) and stationary-phase cell densities (OD600) of wild-type and mutant strains grown with lactate (A and B), 50% (vol/vol) hydrogen (C and D), or 5% (vol/vol) hydrogen (E and F) as the sole electron donor for the reduction of sulfate. The data are averages from at least four independent experiments. Error bars represent 95% confidence intervals.
