A 350bp gypsy\su(Hw)BR fragment flanked by loxP sites has been inserted into the endogenous y gene, at +660bp relative to the y transcriptional start site.
In y1; yP1\loxP.gypsy\su(Hw)BR-350.+660 adult females have wild-type levels of pigmentation in all tissues, including bristles and tarsal claws.