UASt regulatory sequences drive expression of an inverted repeat.
Expression of HP4KK109639 under the control of Scer\GAL4en.PU results in ectopic vein formation at the posterior crossvein. Expression controlled by any of the following: Scer\GAL4ey.PH, Scer\GAL4GMR.PF or Scer\GAL4nub.PK has no overt adult phenotype. Scer\GAL4Act5C.PI-driven expression is viable.