protoporphyrinogen IX + 3 a ubiquinone => protoporphyrin IX + 3 a ubiquinol
protoporphyrinogen ix + 3 a ubiquinone => protoporphyrin ix + 3 a ubiquinol
protoporphyrinogen IX + 3 a ubiquinone => protoporphyrin IX + 3 a ubiquinol
protoporphyrinogen ix + 3 a ubiquinone => protoporphyrin ix + 3 a ubiquinol