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 <=> 2 superoxide + a ubiquinone + 2 h(+)