2 superoxide + a ubiquinone + 2 H(+) => a ubiquinol + 2 O2
2 superoxide + a ubiquinone + 2 h(+) => a ubiquinol + 2 o2
2 superoxide + a ubiquinone + 2 H(+) => a ubiquinol + 2 O2
2 superoxide + a ubiquinone + 2 h(+) => a ubiquinol + 2 o2