1.3.1.2	-15°C, 20% loss of activity after 1 month	
1.3.1.2	-20°C, 2 mg/ml protein, 10% loss of activity after 2 weeks	
1.3.1.2	-20°C, protein concentration 0.5-1 mg/ml, 1 mM dithiothreitol, stable for several months	
1.3.1.2	-80°C, 35 mM potassium phosphate, pH 7.4, 1 mM dithioerythritol, more than 2 months without loss of activity, without dithioerythritol 50% loss of activity