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) = galactarate(out) + h(+)(out)