3.2.1.126	-20°C, crude cell wall preparation, frozen with liquid nitrogen, at least 3 months	
3.2.1.126	4°C, in 0.025 M McIlvaine buffer, pH 5, 0.1 M NaCl, 0.02% NaN3, less than 10% loss of activity within 15 days	
3.2.1.126	4°C, in the presence of 0.5 M NaCl, several months