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Autofermentative metabolite excretion from wild-type WT (⋄) and nifJ (□) cultures. Lactate, alanine, and acetate concentrations were determined by 1H NMR. H2 concentrations in the headspace were measured by gas chromatography. The ordinate gives the concentrations per 1017 cells. Error bars represent ± one standard deviation calculated from the results of three biological replicate experiments.
