4.2.1.65	not stabilized by rapid freezing in liquid nitrogen, storage at 4 or -20ŚC with mercaptoethanol, dithiothreitol, beta-cyano-L-alanine or asparagine	
4.2.1.65	stabilized as ammonium sulfate precipitate	
4.2.1.65	very unstable, dithiothreitol, GSH and 2-mercaptoethanol protect