2.1.1.279 Cu2+ 2.5 mM, 97% inhibition 19 2.1.1.279 Fe2+ 2.5 mM, 47% inhibition 25 2.1.1.279 Mn2+ 2.5 mM, 35% inhibition 11 2.1.1.279 additional information no inhibitory effect on the activity is observed by incubation with 2.5 mM K+, Na+, Ca2+, and Mg2+ 2 2.1.1.279 Zn2+ 2.5 mM, 97% inhibition 14