FRT cassette has been excised, juxtaposing the αTub84B promoter and mutant ftz coding sequences.
adult abdominal segment 2
adult abdominal segment 4
haltere
larval segment
wing | ectopic
16% of mutant first instar larvae show partial segmental deletions. 9% of adults show partial deletion of A4 and/or A2. Also a 0.7% of adults exhibit haltere to wing transformations.
ftzΔ257-316.αTub84B partially rescues ftz11/ftz13