UAS regulatory sequences drive expression of a mutant form of abd-A in which the YPWM and TDWM motifs have been mutated to alanine and which contains an internal deletion removing most of the UR motif. The protein is tagged with Tag:MYC.
Only 2% of larvae co-expressing abd-A2WAla.Δ200-220.Scer\UAS.T:Hsap\MYC and AntpScer\UAS.cMa under the control of Scer\GAL4arm.PS show transformation of the T1 segment towards an A2 fate.