UAS regulatory sequences drive expression of full-length Antp. The YPWM motif has been mutated to AAAA, and the naturally occurring long linker (8 amino acid residues) is present between the mutated motif and the homeodomain. A WRPW repressor motif has been fused to the C-terminal end of the protein.
Expression of AntpAAAA.LL.WRPW.Scer\UAS under the control of Scer\GAL4nullo.PG results in transformation of head to mesothorax and repression of the prothoracic beard.
Expression of AntpAAAA.LL.WRPW.Scer\UAS under the control of Scer\GAL4Dll.PU results in loss of the arista and the presence of numerous tarsal bristles on the antenna.