1.4.99.6	D-arginine + acceptor + H2O = 5-guanidino-2-oxopentanoate + NH3 + reduced acceptor	
1.4.99.6	D-arginine + acceptor = iminoarginine + reduced acceptor	
1.4.99.6	iminoarginine + H2O = 5-guanidino-2-oxopentanoate + NH3