D-glucose(out) + H(+)(in) => D-glucose(in) + H(+)(out)
d-glucose(out) + h(+)(in) => d-glucose(in) + h(+)(out)
D-glucose(out) + H(+)(in) => D-glucose(in) + H(+)(out)
d-glucose(out) + h(+)(in) => d-glucose(in) + h(+)(out)