1.13.12.3	-10°C, protein concentration 4 mg/ml, 2 months, less than 10% loss of activity	
1.13.12.3	-10°C, protein concentration less than 0.3 mg/ml, 40% loss of activity after 24 h	
1.13.12.3	-20°C, several weeks without significant loss in activity	
1.13.12.3	4°C, several weeks without significant loss in activity