Insertion in the first exon.
A number of flr4/flrEY05812 adult escapers can be obtained. These escapers have an obvious "flare" phenotype (highly abnormal wing hairs) in the distal region of the wing, with a progressively weaker phenotype moving proximally.
flrEY05812/flr4 is rescued by Scer\GAL4ptc-559.1/flrUAS.GFP
Excision of the P{EPgy2}flrEY05812 insertion can revert the lethality and "flare" wing hair phenotype.