2.1.1.25	-4°C, 100 mM potassium phosphate buffer, pH 6.5, 1 mM dithiothreitol, 75% loss of activity, in presence of 10% glycerol 5% loss of activtiy	
2.1.1.25	2°C, 100 mM potassium phosphate buffer, pH 6.5, 1 mM dithiothreitol, a half-life of approximately 30 h