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Cell-specific rate of CH4 production at varying NH4Cl concentrations. Methanocaldococcus jannaschii (●) and M. bathoardescens (○) were grown at 82°C, and M. thermolithotrophicum (▲) was grown at 65°C. The data for M. bathoardescens are from Ver Eecke et al. (2013) and are provided for comparison. The error bars represent the 95% confidence intervals.
