3.11.1.3	-20°C, 10 weeks, 54% loss of activity	
3.11.1.3	-20°C, 25% glycerol, 6 months, about 20% loss of activity	
3.11.1.3	20, 50% loss of activity after 3 days, complete loss of activity after 6 days	
3.11.1.3	4°C, 30 days, 38% loss of activity