5.5.1.2	-20°C, 50 mM Tris/HCl, 100 mM NaCl, 0.5 mM dithiothreitol, completely stable	
5.5.1.2	20°C, 50 mM Tris/HCl, 100 mM NaCl, 0.5 mM dithiothreitol, 50% loss of activity	
5.5.1.2	4°C, 50 mM Tris/HCl, 100 mM NaCl, 0.5 mM dithiothreitol, 36 days, completely stable