2.1.3.3	ornithine carbamoyltransferase	L-arginine biosynthesis I (via L-ornithine)	-	
4.3.2.1	argininosuccinate lyase	L-arginine biosynthesis I (via L-ornithine)	-	
6.3.4.5	argininosuccinate synthase	L-arginine biosynthesis I (via L-ornithine)	-	
6.3.5.5	carbamoyl-phosphate synthase (glutamine-hydrolysing)	L-arginine biosynthesis I (via L-ornithine)	-