2.1.1.274 20 40 SAMT is 100% stable for 30 min at 20°C and 80% stable for 30 min at 30°C, but after 30 min incubation at 40°C it completely loses activity 721412 2.1.1.274 42 - enzyme is stable at temperatures up to 42°C for 30 min but 30-min incubation at 65°C leads to a 70% loss of activity 721415