4.1.2.19	0-4°C, crystalline enzyme, containing 0.2-1.0% protein, stable for at least 3 months	
4.1.2.19	0-4°C, pH 7.0, 0.01 M mercaptoethanol, stable for at least 3 months	
4.1.2.19	25°C, 28 days, about 30% loss of activity	
4.1.2.19	4°C, 28 days, less than 20% loss of activity