2 nitrate(in) + H(+)(in) => 2 nitrate(out) + H(+)(out)
2 nitrate(in) + h(+)(in) => 2 nitrate(out) + h(+)(out)
2 nitrate(in) + H(+)(in) => 2 nitrate(out) + H(+)(out)
2 nitrate(in) + h(+)(in) => 2 nitrate(out) + h(+)(out)