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Relative efficiency of nitrogenase electron allocation. The values for bars with the same letter were statistically similar at the 5% confidence level. Each value is the mean of the values from three replicates. Relative efficiency (RE) was determined by the formula of Van Kessel and Burris (45): RE = 1 − [(H2 evolution in air)/(C2H2 reduction + H2 evolution in 10% C2H2)].
