UASt regulatory sequences drive expression of the 4F11 single-chain variable fragment antibody, which binds en. The coding sequence is tagged with Tag:MYC. No secretion signal peptide is present in this transgene.
Expression of en4F11ScFv.Scer\UAS.T:Hsap\MYC in the wing pouch under the control of Scer\GAL4Bx-MS1096 results in loss of the anterior crossvein (ACV) and all or part of the posterior crossvein (PCV). 80% of flies lack the ACV and 51% lack the PCV.