1.2.7.4	-20°C or 5°C, 50 mM Tris/HCl, pH 7.5, 2 mM sodium dithionite, 0.2 mM methyl viologen, 50% v/v glycerol, stable for more than 1 month	
1.2.7.4	-20°C, stored frozen in an oxygen-free atmosphere in buffer containing glycerol and 2 mM dithionite, not stable for more than 1 month	
1.2.7.4	-70°C, samples thawed under anaerobic conditions exhibits full activity even after 6 months of storage	
1.2.7.4	10°C, Tris/HCl, pH 7.6, enzyme is active for at least 2 days	
1.2.7.4	4°C, 1 month, 100% inactivation	
1.2.7.4	5°C, stored in an oxygen-free atmosphere in buffer containing glycerol and 2 mM dithionite, not stable for more than 1 month