Fe(III)-heme b-[protein] + nitric oxide + H2O => Fe(II)-heme b-[protein] + nitrite + 2 H(+)
fe(iii)-heme b-[protein] + nitric oxide + h2o => fe(ii)-heme b-[protein] + nitrite + 2 h(+)
Fe(III)-heme b-[protein] + nitric oxide + H2O => Fe(II)-heme b-[protein] + nitrite + 2 H(+)
fe(iii)-heme b-[protein] + nitric oxide + h2o => fe(ii)-heme b-[protein] + nitrite + 2 h(+)