2.4.2.56	Ca2+	10 mM, 75% inhibition	15	
2.4.2.56	Co2+	1 mM, 96% inhibition	23	
2.4.2.56	Cu2+	1 mM, 99% inhibition	19	
2.4.2.56	iodoacetamide	1 mM, 44% inhibition	67	
2.4.2.56	Mg2+	20 mM, 77% inhibition	6	
2.4.2.56	Mn2+	10 mM, 98% inhibition	11	
2.4.2.56	Phenylmercuriacetate	1 mM, 98% inhibition	3487	
2.4.2.56	Zn2+	1 mM, 99% inhibition	14