1.7.1.13	Cu2+	0.01 mM, 82% residual activity	
1.7.1.13	Fe3+	0.01 mM, 92% residual activity	
1.7.1.13	Ni2+	0.01 mM, 77% residual activity	
1.7.1.13	Zn2+	0.01 mM, 13.5% residual activity