2.4.1.198 Ca2+ activates 638130 2.4.1.198 K+ activates 638130 2.4.1.198 Mg2+ activates 638130 2.4.1.198 Mg2+ required 736462 2.4.1.198 Mn2+ activates 638130 2.4.1.198 additional information requires cations for activity, such as Mn2+, Mg2+, K+ or Ca2+ 638130