melibiose(out) + Na(+)(out) => melibiose(in) + Na(+)(in)
melibiose(out) + na(+)(out) => melibiose(in) + na(+)(in)
melibiose(out) + Na(+)(out) => melibiose(in) + Na(+)(in)
melibiose(out) + na(+)(out) => melibiose(in) + na(+)(in)