Fe(II)-heme a + 2 AH2 => Fe(II)-heme o + 2 A + H2O
fe(ii)-heme a + 2 ah2 => fe(ii)-heme o + 2 a + h2o
Fe(II)-heme a + 2 AH2 => Fe(II)-heme o + 2 A + H2O
fe(ii)-heme a + 2 ah2 => fe(ii)-heme o + 2 a + h2o