1.4.1.13	-80°C, 20 mM potassium-HEPES, pH 7.2, 2 mM alpha-ketoglutarate, 1 mM EDTA, stable for at least 6 months	
1.4.1.13	4°C, 20 mM potassium-HEPES, pH 7.2, 2 mM alpha-ketoglutarate, 1 mM EDTA, 5 mM 2-mercaptoethanol, 20% loss of activity, after 1 month	
1.4.1.13	4°C, 200 mM potassium phosphate buffer, pH 7.6, 0.5 mM Na2EDTA	
1.4.1.13	4°C, unprotected enzyme loses 65% of activity after 24 h	
1.4.1.13	storing at -20°C, total loss of activity after 10 days