5.4.99.15	hanging drop vapor diffusion method, using 0.2 M potassium sodium tartrate tetrahydrate, 20% (w/v) polyethylene glycol 3350	
5.4.99.15	hanging-drop vapour-diffusion method at 4°C. The chemical modification of this enzyme by reductive methylation of lysine residues significantly improves the crystal quality for X-ray diffraction experiments. The crystals of the modified enzyme belong to orthorhombic space group P2(1)2(1)2(1), with unit-cell parameters a = 56.70, b = 140.1, c = 205.2 A measured at cryo-temperature, and are found to contain two enzyme molecules per asymmetric unit	
5.4.99.15	recombinant enzyme expressed in Escherichia coli, hanging-drop vapour-diffusion method, chemical modification of this enzyme by reductive methylation of lysine residues significantly improves the crystal quality for X-ray diffraction experiments