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(a) Growth of ethanol producing JWCB032 and JWCB032Δrex conducted in media containing 1/10th of typical concentration of ammonia. (b) Acetate and (c) ethanol produced by strains JWCB032Δrex and JWCB032 showing a shift away from acetate and toward ethanol production after 36 hr of fermentation. Error bars represent one standard deviation of two culture replicates. Points on line plots and values indicated in bar plots are mean values of two biological replicates
