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