1.1.2.7	-18°C, purified native enzyme, 0.05 M sodium phosphate buffer, pH 7.5, loss of 10% of activity after 1 month	
1.1.2.7	-80°C, purified native enzyme, 20 mM phosphate, pH 7.0, negligible loss of activity in 6 months	
1.1.2.7	4°C, purified native enzyme, 0.05 M sodium phosphate buffer, pH 7.5, loss of 30% of activity after 24 h	
1.1.2.7	4°C, purified native enzyme, 20 mM phosphate, pH 7.0, loss of 80% activity within 1 week