Fig. 6From: Improving the specific activity and pH stability of xylanase XynHBN188A by directed evolutionDocking analysis of XynHBN188A (a) and XynHBN188A217 (b). The ligand was shown in purple, the two active site residues (E94 and E183) were drawn in red, R128 and Q131 were shown in greenBack to article page