Fe(II)-heme b-[protein] + nitric oxide + O2 => Fe(III)-heme b-[protein] + nitrate
fe(ii)-heme b-[protein] + nitric oxide + o2 => fe(iii)-heme b-[protein] + nitrate
Fe(II)-heme b-[protein] + nitric oxide + O2 => Fe(III)-heme b-[protein] + nitrate
fe(ii)-heme b-[protein] + nitric oxide + o2 => fe(iii)-heme b-[protein] + nitrate