3.1.4.16	-20°C, pH 8.0, 20 mM Tris buffer, stable for at least 6 months	
3.1.4.16	-20°C, several weeks, stable	
3.1.4.16	2-4°C, pH 7.4-7.6, Tris buffer, 20-30% loss of activity after 2 months	
3.1.4.16	4°C or -12°C, stable	
3.1.4.16	4°C, 5% glycerol, 0.5 M NaCl, pH 7.5, no loss in activity after several months