1.10.3.4	-20°C, stable for at least 1 month	
1.10.3.4	4°C, enzyme on nanogel, 5 weeks, no loss of activity	
1.10.3.4	4°C, lyophilized enzyme, 5 weeks, 65% loss of activity	
1.10.3.4	4°C, native enzyme at pH 4.5, 5 weeks, 98% loss of activity