Imprecise excision of the progenitor insertion, resulting in a deletion of 1249bp which extends from the original insertion site into the Git open reading frame, deleting sequences encoding the N-terminal 260 amino acid residues.
100% of homozygous escapers have defective wing morphology; the wings are crumpled, uneven and sometimes curled upwards or not fully spread. Gitex21C/Gitex51C adults also have a defective wing phenotype.