2.7.2.14	Co2+	65% of the activity with Mn2+	
2.7.2.14	Cu2+	58% of the activity with Mn2+	
2.7.2.14	Mg2+	96% of the activity with Mn2+	
2.7.2.14	Mn2+	divalent cation required, highest activity with Mn2+	
2.7.2.14	Zn2+	42% of the activity with Mn2+