The majority of CTCFP30.6/Df(3L)0463, CTCFGE24185/Df(3L)0463, CTCFP30.6 or CTCFGE24185 flies are fully rescued by the presence of CTCF+t.5084, with a few showing various degrees of held-out wings and are unable to walk properly. The rescued flies are fertile and can be used to establish a breeding stock.