N(omega)-hydroxy-L-arginine + 2 Fe(II)-[cytochrome b5] + 2 H(+) => L-arginine + 2 Fe(III)-[cytochrome b5] + H2O
n(omega)-hydroxy-l-arginine + 2 fe(ii)-[cytochrome b5] + 2 h(+) => l-arginine + 2 fe(iii)-[cytochrome b5] + h2o