Change in glucan conversion plotted against change in xylan conversion for Accellerase XC (a) and optimized Accellerase XC (b) over 120 h of incubation with pretreated barley straw (2% biomass load). Xylose released plotted against acetate released by Accellerase XC (c) and optimized Accellerase XC (d), from pretreated barley straw (2% biomass load) over 120 h of incubation. Optimized Accellerase XC composition was identical to those used in Figure 3c. Enzymes were included at 15 mg/g glucan. Error bars represent SD of the mean (n = 8).