2.5.1.7 K+ highest activity in the presence of K+ 739518 2.5.1.7 additional information not affected by K+, Na+, Mg2+, and Mn2+ 637587 2.5.1.7 additional information not influenced by NH3+, Ca2+, Mg2+, and Cu2+ 739518 2.5.1.7 additional information the enzyme is independent of Mg2+ and Ca2+ 739623 2.5.1.7 Na+ - 739518