1.13.12.19	ascorbate	stimulates	
1.13.12.19	ascorbate	required	
1.13.12.19	D-arginine	3% of the activity with L-arginine	
1.13.12.19	DTT	stimulates	
1.13.12.19	L-arginine	highly specific for cofactor L-arginine, KM value 0.018 mM	
1.13.12.19	L-canavanine sulfate	7% of the activity with L-arginine