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Cell wall loosening and strengthening activities of XTHs through the respective breaking or joining of XyGs that cross-link (blue) or do not cross-link (magenta) 2 cellulose microfibrils (green). XTHs carrying out XET (black triangles) are illustrated together with arrows indicating the respective acceptor XyGs. While XET activity can either (A) loosen or (B) strengthen cell walls, (C) XTHs performing XEH (white triangle) only contribute to wall loosening.
