6.3.2.12	Fe2+	divalent cation requirement is satisfied by Mg2+, Mn2+ or Fe2+	1015	
6.3.2.12	K+	K+ is most effective	1019	
6.3.2.12	K+	Km: 7 mM	1015	
6.3.2.12	K+	maximal activity at 80 mM	1007	
6.3.2.12	K+	monovalent cation required	1010	
6.3.2.12	K+	monovalent cation required, 200 mM K+ is most effective	1008	
6.3.2.12	K+	monovalent cation requirement is satisfied by K+ or NH4+	1007, 1021	
6.3.2.12	K+	monovalent cation requirement is satisfied by K+, Rb+ or NH4+	1010, 1015, 1019	
6.3.2.12	K+	optimal concentration is 50 mM	1015	
6.3.2.12	K+	required	1016