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