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Comparison of the products of four rice XET-related genes. A, Alignment of the deduced amino acid sequences of OsXTR1, OsXTR2, OsXTR3, and OsXTR4. Boxes indicate identical residues. Bar a, Catalytic active site shared with B. licheniformis β-glucanase. Bar b, Proposed N-linked glycosylation sites. Shaded boxes show the conserved Cys residues. B, Percent amino acid identity between the XTR gene products.
