3.4.22.6	-20°C, freeze-dryed, stable for at least 1 month	
3.4.22.6	0°C, pH 2.0, stable	
3.4.22.6	4°C, 15% loss of activity after 2 weeks	
3.4.22.6	4°C, stable in solution for at least 1 month	
3.4.22.6	frozen, 50% loss of activity after 24 h