6.4.1.4	-20°C, 4 months, less than 20% loss of activity	
6.4.1.4	-20°C, for at least 3 months without loss of activity	
6.4.1.4	-20°C, purified rnzyme can be stored up to 6 months with minimal loss of activity	
6.4.1.4	-80°C, approximately 25% loss of activity per month