melibiose(in) + Li(+)(in) <=> melibiose(out) + Li(+)(out)
melibiose(in) + li(+)(in) <=> melibiose(out) + li(+)(out)
melibiose(in) + Li(+)(in) <=> melibiose(out) + Li(+)(out)
melibiose(in) + li(+)(in) <=> melibiose(out) + li(+)(out)