1.3.1.31	-18°C, pH 7, buffer containing 10 mM phosphate and 0.1 M KCl, formation of a dissociation product sedimenting at about 10 S	
1.3.1.31	-20°C, phosphate buffer, pH 7.0, containing (E)-2-methyl-2-butenoate, EDTA, sucrose and 2-mercaptoethanol, repeatedly thawed and frozen, 50% loss of activity	
1.3.1.31	4°C, anaerobic conditions, no loss of activity