3.5.1.46 35 - stable for 1 h 172042 3.5.1.46 40 - 30 min, stable up to 684568 3.5.1.46 45 - stable up to 172039 3.5.1.46 50 - EII most heat-stable 172040 3.5.1.46 55 - 30 min, enzyme retains 90% of its activity 684568 3.5.1.46 60 - 30 min, enzyme retains 90% of its activity 684568