H2 + a ubiquinone + 2 H(+)(in) => a ubiquinol + 2 H(+)(out)
h2 + a ubiquinone + 2 h(+)(in) => a ubiquinol + 2 h(+)(out)
H2 + a ubiquinone + 2 H(+)(in) => a ubiquinol + 2 H(+)(out)
h2 + a ubiquinone + 2 h(+)(in) => a ubiquinol + 2 h(+)(out)