1.7.2.3	-80°C stable for several months	
1.7.2.3	-80°C, 10% loss of activity after 15 days	
1.7.2.3	-80°C, 45% loss of activity after 30 days	
1.7.2.3	-80°C, inducible and constitutive enzyme, 10% loss of activity after 15 days	
1.7.2.3	0°C, 50 mM sodium phosphate buffer, pH 7.3, 30% loss of activity after 17 days