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As a result of γ-mutagenesis of Trichoderma longibrachiatum TW1 and the subsequent selection of improved producers, a novel mutant strain, TW1-59-27, capable of efficiently secreting cellulase and xylanase was obtained. In a fed-batch cultivation, the new TW1-59-27 mutant was significantly more active compared with the original TW1 strain. For instance, the activities...