Table 2. Crystallization conditions.

Method	Hanging-drop vapour diffusion
Plate type	Iwaki 24-well plate
Temperature (K)	277
Protein concentration (mg ml−1)	5
Buffer composition of protein solution	0.02 M Tris–HCl pH 8.0, 0.02 M NaCl
Composition of reservoir solution	22%(w/v) PEG 3350, 0.1 M citric acid pH 3.5
Volume and ratio of drop	2 µl protein and 2 µl reservoir, 1:1
Volume of reservoir (µl)	750