1.2.1.39	-20°C, in 250 mM Tris-HCl pH 7.0, 3 months, 52% loss of activity	
1.2.1.39	-20°C, phosphate buffer (pH 7.7), 99% (v/v) glycerol, 76 days, 44.3% residual activity	
1.2.1.39	-20°C, phosphate buffer (pH 7.7), 99% (v/v) glycerol, 93 days, 92.3% residual activity	
1.2.1.39	0°C, in 250 mM Tris-HCl pH 7.0, 3 months, 46% loss of activity	
1.2.1.39	4°C, 10 mM Tris-HCl buffer