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Trichoderma reesei is used industrially to produce a wide variety of enzymes including cellulases and hemicellulases, and has a central role in development of enzymes for second generation production of biofuels and chemicals from lignocellulosic biomass.The enzyme system responsible for cellulose degradation consists of cellobiohydrolases releasing cellobiose units from cellulose chain ends, endoglucanases cleaving the cellulose chain at the middle and β-glucosidases converting cello-oligosaccharides and cellobiose to glucose.