2.1.1.90	HgCl2	1 mM, 90% inhibition	110	
2.1.1.90	Na2SO3	1 mM, 50% inhibition	3653	
2.1.1.90	NaNO2	0.1 mM, 90% inhibition	3835	
2.1.1.90	NH4Cl	400 mM, 93% inhibition	329	
2.1.1.90	O2	inactivation by O2 and other oxidizing agents	9	
2.1.1.90	pyridoxal 5'-phosphate	1 mM, 74% inhibition	32