4.3.2.2	-20°C or -80°C, pH 7.0, 150 mM KCl, 1 mM EDTA, 1 mM DTT and 10% glycerol, 3 months, the recombinant enzyme loses more than 50% of initial activity	
4.3.2.2	-70°C, 10% glycerol, 1 mM dithiothreitol, 0.01 M Tris, pH 7.4, activity in lysates from all cell lines is stable for more than 6 weeks	
4.3.2.2	-70°C, unstable to storage	
4.3.2.2	-80°C or -20°C, recombinant enzyme is very unstable regardless of salt or glycerol concentration	
4.3.2.2	-80°C, potassium phosphate buffer, KCl, DTT, EDTA, glycerol	
4.3.2.2	2°C or -20°C, stable for two months	
4.3.2.2	4°C, stable for several weeks