2.5.1.20 25 - enzyme activity in rubber particles purified from line 593 decreases below limits of detection in 1 h at 25°C, whereas activity is stable for much longer in particles from line 11591 723103 2.5.1.20 40 - 10 min, partial denaturation 638725 2.5.1.20 60 - 10 min, complete inactivation 638725