3.1.1.31 50 - 44% loss of activity after 5 min 649488 3.1.1.31 50 - 95% loss of 6PGL activity after 5 min 649488 3.1.1.31 57 - melting temperature 750863 3.1.1.31 60 - 5 min, 30% loss of activity 80869 3.1.1.31 65 - 5 min, complete loss of activity 80869