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