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	
2.1.1.274	Mg2+	5 mM, mild inhibitory effect, less than 35% reduced activity	6	
2.1.1.274	Mn2+	5 mM, mild inhibitory effect, less than 35% reduced activity	11	
2.1.1.274	Mn2+	5 mM, inhibits SAMT activity less than 30%	11	
2.1.1.274	Mn2+	about 25% residual activity at 5 mM	11	
2.1.1.274	additional information	5 mM Na+ and NH4+ have no effect on activity	2	
2.1.1.274	additional information	presence of 5 mM Mg2+ in the assay reaction and addition of K+, NH4+ and Ca2+ does not affect SAMT activity	2	
2.1.1.274	Na+	5 mM, inhibits SAMT activity less than 30%	59	
2.1.1.274	Zn2+	5 mM, strong inhibitory effect with 50–100% inhibition	14	
2.1.1.274	Zn2+	5 mM, inhibits SAMT activity less than 30%	14	
2.1.1.274	Zn2+	complete inhibition at 5 mM	14