ubiquinone-8 + NADH + H(+) => ubiquinol-8 + NAD(+)
ubiquinone-8 + nadh + h(+) => ubiquinol-8 + nad(+)
ubiquinone-8 + NADH + H(+) => ubiquinol-8 + NAD(+)
ubiquinone-8 + nadh + h(+) => ubiquinol-8 + nad(+)