2.4.2.19	-20°C, enzyme in treated extract, stable	
2.4.2.19	-90°C, stable for several months in 0.05 M potassium phosphate buffer, pH 7.0, 50% sucrose w/v and 0.01 M dithiothreitol	
2.4.2.19	0-4°C, crystalline enzyme is stable for at least 2 years	
2.4.2.19	4°C, stable for 1 month