2.5.1.44	K+	optimal activity with 40 mM, Na+ and Rb+ are less effective	
2.5.1.44	K+	activates, optimal concentration at 50 mM	
2.5.1.44	K+	required for full activity, optimal activity at 50 mM	
2.5.1.44	K+	dependent on, best at 50 mM	
2.5.1.44	Na+	less effective than K+ in activation	
2.5.1.44	Rb+	less effective than K+ in activation