1.1.1.38	-20°C, 15 mM triethanolamine-maleate, pH 7.5, 1 mM EDTA, 10 mM dithiotreitol, 5% glycerol, several months, no loss of activity	
1.1.1.38	4°C, 50 mM Tris-HCl, pH 7.4, 1 mM EDTA, 10 mM 2-mercaptoethanol, 10 mM MgCl2, 5 mM L-aspartate, 2 months, 10% activity lost	
1.1.1.38	4°C, 50 mM Tris-HCl, pH 7.4, 1 mM EDTA, 10 mM 2-mercaptoethanol, 2 months, 15% activity lost	
1.1.1.38	4°C, 50 mM Tris-HCl, pH 7.4, 1 month, 90% activity lost