4.6.1.14 Ca2+ activation, Mg2+ cannot replace Ca2+ 648770 4.6.1.14 Ca2+ not 648767 4.6.1.14 Hg2+ 10 microM 100% inhibition, 1 microM 67% activity left 135294 4.6.1.14 additional information calcium-independent 135294 4.6.1.14 Zn2+ 100 microM 100% inhibition, 10 microM 59% activity left 135294