UAS regulatory sequences drive expression of a chimeric Ubx::Afra\Ubx protein in which the first 250 amino acid residues of Afra\Ubx replace the comparable region of Ubx. The protein is tagged at the C-terminal end with Tag:HA.
Expression of Ubx::Afra\Ubx250.Scer\UAS.T:Ivir\HA1 under the control of Scer\GAL4arm.PS suppresses the formation of Keilin's organs in 70% of cases.