The ftz-f1 AF2 motif has been replaced by the equivalent motif from Hr39.
ftz-f1::Hr39AF2.UAS/Scer\GAL4arm.PS is a suppressor of embryo | pair rule expression pattern phenotype of ftz-f1209
The addition of ftz-f1::Hr39AF2.Scer\UAS to ftz-f1209 flies partially rescues the pair rule phenotype.