3.4.23.47	-80°C, stored in 10 mM potassium phosphate, pH 7.5, containing 125 mM KCl and 0.0125% Tween 20	
3.4.23.47	4°C, phosphate buffer pH 6 and 50 mM NaCl, 72 h, no loss of activity	
3.4.23.47	stored at -20°C without loss of activity