1.6.1.1	-15°C, 50 mM Tris-HCl buffer, pH 7.5, no loss of activity in 12 weeks	
1.6.1.1	-20°C, 50 mM Tris-HCl, pH 7.0, 2 mM dithiothreitol, several weeks, no loss of activity, great loss of activity after several months	
1.6.1.1	25°C, purified enzyme, 25 days, 65% activity remaining	
1.6.1.1	4°C, 0.1 M phosphate buffer, pH 7.5, 1 mM EDTA, several months, no loss of activity, storage at -20°C yields a partly insoluble enzyme	
1.6.1.1	4°C, purified enzyme, 25 days, stable