Endohydrolysis of (1->4)-beta-D-xylosidic linkages in xylans. Belongs to the glycosyl hydrolase 10 (cellulase F) family. Ref.2, PubMed:1924265 and PubMed:10409823 N-terminal modification was incorrect. X-ray structure has cyclic pyroglutamic acid. Sequencing errors. Sequencing errors.