UASt regulatory sequences drive expression of a mutant form of CtBP that is defective in dimerization (carries the amino acid replacements R141A and R142A). The coding sequence is tagged at the C-terminal end with two copies of Tag:FLAG.
Expressing CtBPDim1.UAS.2xTag:FLAG under the control of Scer\GAL4en.PU has no impact on posterior crossvein morphology.