2.7.4.14	-10°C, 30% loss of activity within 2 months	
2.7.4.14	-20°C, concentrated enzyme solution in 30% glycerol, less than 5% loss of activity per month	
2.7.4.14	-20°C, in 25 mM Tris-acetate buffer, pH 7.5, 50 mM 2-mercaptoethanol, 50% glycerol, stable for at least 2 months	
2.7.4.14	-80°C, up to 12 months	
2.7.4.14	4°C, 0.2 mg/ml, 2 weeks, 20% loss of activity	
2.7.4.14	4°C, considerable loss of activity within 24 h, DTT stabilizes, more stable in 20 mM phosphate buffer, pH 8 than in Tris-HCl buffer