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) = 2 nitrate(in) + h(+)(in)