2 superoxide + a menaquinone + 2 H(+) => a menaquinol + 2 O2
2 superoxide + a menaquinone + 2 h(+) => a menaquinol + 2 o2
2 superoxide + a menaquinone + 2 H(+) => a menaquinol + 2 O2
2 superoxide + a menaquinone + 2 h(+) => a menaquinol + 2 o2