The first 5 Ser and Thr residues in the C-terminal portion of Afra\Ubx are mutated to Ala.
Keilin organ, with Scer\GAL4arm.PS
Expression of Afra\UbxS.T-A.1-5.Scer\UAS.T:Ivir\HA1 under the control of Scer\GAL4arm.PS suppresses the formation of Keilin's organs in 35% of cases.