4.1.2.17	10-20% of the activity is lost over a period of several months of storage with repeated freezing and thawing	5048	
4.1.2.17	15% isopropyl alcohol, enzyme maintains more than 90% of its activity	5055	
4.1.2.17	50% acetonitrile, enzyme maintains more than 90% of its activity	5055	
4.1.2.17	6 M, urea, enzyme maintains more than 90% of its activity	5055