galactarate(out) + H(+)(out) => galactarate(in) + H(+)(in)
galactarate(out) + h(+)(out) => galactarate(in) + h(+)(in)
galactarate(out) + H(+)(out) => galactarate(in) + H(+)(in)
galactarate(out) + h(+)(out) => galactarate(in) + h(+)(in)