2.1.4.2	cystamine	-	
2.1.4.2	cystine	-	
2.1.4.2	formamidine disulfidedihydrochloride	-	
2.1.4.2	ornithine	product inhibition, most potent competitive inhibitor	
2.1.4.2	p-chloromercuribenzoate	-