4.2.2.21	Ca2+	10 mM, partial inhibition	15	
4.2.2.21	Cu2+	-	19	
4.2.2.21	Fe2+	-	25	
4.2.2.21	Fe3+	10 mM, complete inhibition	70	
4.2.2.21	heparin	-	227	
4.2.2.21	heparin	50% inhibition at 0.050 mg/ml for enzyme I and 0.005 mg/ml for enzyme II	227	
4.2.2.21	heparitin sulfate	-	129859	
4.2.2.21	keratosulfate	-	129858	
4.2.2.21	Mn2+	10 mM, partial inhibition	11	
4.2.2.21	additional information	not inhibitory: ammonium sulfate	2	
4.2.2.21	additional information	not inhibitory: Ni2+, Fe2+, Cu2+, Ca2+, Mg2+, Ba2+, Mn2+	2	
4.2.2.21	N-desulfated heparin	50% inhibition at 0.150 mg/ml for enzyme I and 0.025 mg/ml for enzyme II	31249	
4.2.2.21	NaCl	optimal concentration 62.5 mM for substrate chondroitin 6-sulfate, 50% inhibition at 125 mM, optimal concentration 125 mM for substrate dermatan sulfate, 50% inhibition at 250 mM	42	
4.2.2.21	phosphate	10 mM, 10% residual activity	16	
4.2.2.21	Zn2+	-	14	
4.2.2.21	Zn2+	1 mM, complete inhibition	14