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Ribbon representation of Thermobacillus xylanilyticus xylanase (Tx-Xyn) three-dimensional structure. The schematic protein is 'color-ramped' from the N-terminus (blue, N-ter) to the C-terminus (red, C-ter). The relevant regions of 'thumb', 'palm' and 'fingers' are highlighted in frames, and the 'knuckles' in the fingers region are indicated by an arrow.
