6.5.1.3	-20°C	
6.5.1.3	-20°C, stable for at least 6 months	
6.5.1.3	-70°C, stable for at least 1 year	
6.5.1.3	4°C, 32% loss of activity after 2 weeks	
6.5.1.3	in liquid nitrogen, at 0.5 mg protein per ml, stable for at least 6 months