Table 2. Crystallization of hisZC3H41^ΔN331 .

Method	Vapor diffusion
Plate type	24-well VDX hanging-drop plate, Hampton Research
Temperature (K)	289
Protein concentration (mg ml−1)	14
Buffer composition of protein solution	30 mM HEPES pH 7.5, 200 mM NaCl, 10% glycerol, 5 mM β-mercaptoethanol
Composition of reservoir solution	16%(v/v) PPGBA 2000, 0.2 M imidazole pH 7
Volume and ratio of drop	2 µl (1:1)
Volume of reservoir (µl)	400