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Abundance of the enzymes representing each gene in the n-butanol cluster (AtoB, Hbd, Crt, Bcd and AdhE2) during a 96-h fermentation of C. cellulolyticum carrying the vector pM9, using cellobiose as the carbon source. Error bars represent standard errors of five biological replicates. ANOVA revealed no significant changes (p > 0.01) in protein abundance during fermentation, with the exception of a small but significant (p < 0.01) decrease for Bcd
