3.5.1.13	-15°C, stable for 3 months	
3.5.1.13	-15°C, stable for several months	
3.5.1.13	-18°C, 1 week, 18% loss of activity	
3.5.1.13	25°C, 1 week, 5% loss of activity	
3.5.1.13	4°C or 20°C, stable for 420 min	
3.5.1.13	4°C, storage after freeze-drying in buffer containing 5% lactose, about 12% loss of activity	
3.5.1.13	rapid loss of activity during purification and storage in Tris-HCl (10 mM, pH 8.0) buffer at 4°C or 20°C, with the addition of 10% glycerol and 50 mM NaCl prior to freezing activity is maintained for up to 3 months with only marginal losses