Arg + Fe3__enos <-> Fe3__Arg Arg + Fe2 <-> Fe2__Arg 0 -> Arg Fe3__enos -> Fe2 Fe3__NO -> Fe3__enos + NO Fe2__NO -> Fe3__enos Fe3__NOHA <-> Fe3__enos + NOHA Fe3__Arg -> Fe2__Arg Fe2__NOHA <-> Fe2 + NOHA Fe2__Arg -> Fe3__O2__Arg Fe3__O2__Arg -> Fe2__Arg Fe3__O2__Arg -> Fe3__NOHA Fe3__NOHA -> Fe2__NOHA Fe2__NOHA -> Fe3__O2__NOHA Fe3__O2__NOHA -> Citrulline + Fe3__NO Fe3__NO -> Fe2__NO Fe3__O2__NOHA -> Fe2__NOHA