4.1.3.16	4¦C, Tris-HCl buffer, pH 7.4, 40% saturated with ammonium sulfate, 6 months, kidney enzyme	
4.1.3.16	4°C, in either 50 mM Tris-HCl or potassium phosphate, pH 7.4, plus 5 mM 2-mercaptoethanol, 0.02% sodium azide, 40% saturated with ammonium sulfate, 100% of initial activity for at least 6 months	
4.1.3.16	4°C, in either 50 mM Tris-HCl or potassium phosphate, pH 7.4, plus 5 mM 2-mercaptoethanol, 0.02% sodium azide, no substantial loss of enzymatic activity for up to 1 month	
4.1.3.16	5¦C, Tris-HCl buffer, pH 7.4, two weeks, sometimes several months