2.1.1.274	Ca2+	5 mM, mild inhibitory effect, less than 35% reduced activity	15	
2.1.1.274	Ca2+	about 65% residual activity at 5 mM	15	
2.1.1.274	Cu2+	5 mM, strong inhibitory effect with 50–100% inhibition	19	
2.1.1.274	Cu2+	5 mM, strong inhibitory effect with more than 95% inhibition	19	
2.1.1.274	Cu2+	complete inhibition at 5 mM	19	
2.1.1.274	Fe2+	5 mM, strong inhibitory effect with 50–100% inhibition	25	
2.1.1.274	Fe2+	5 mM, strong inhibitory effect with more than 95% inhibition	25	
2.1.1.274	Fe2+	complete inhibition at 5 mM	25	
2.1.1.274	Fe3+	5 mM, strong inhibitory effect with 50–100% inhibition	70	
2.1.1.274	Fe3+	complete inhibition at 5 mM	70