1.1.1.75	Cu2+	slight inhibition	
1.1.1.75	Fe2+	slightly activating	
1.1.1.75	K+	required	
1.1.1.75	K+	stimulating at all concentrations	
1.1.1.75	K+	inhibitory at all concentrations	
1.1.1.75	Mg2+	slightly activating at 1.3 mM, inhibitory above 3 mM