1.2.1.80	K+	K+, NH4+, and Rb+ at 0.2 M activate up to 20fold. Inhibitory at hiher concentrations	
1.2.1.80	Mg2+	2 mM used in assay conditions	
1.2.1.80	NH4+	K+, NH4+, and Rb+ at 0.2 M activate up to 20fold. Inhibitory at hiher concentrations	
1.2.1.80	Rb+	K+, NH4+, and Rb+ at 0.2 M activate up to 20fold. Inhibitory at hiher concentrations