a ubiquinone + NADH + H(+) => a ubiquinol + NAD(+)
a ubiquinone + nadh + h(+) => a ubiquinol + nad(+)
a ubiquinone + NADH + H(+) => a ubiquinol + NAD(+)
a ubiquinone + nadh + h(+) => a ubiquinol + nad(+)