Expression of ftzScer\UAS.T:Hsap\MYC, under the control of Scer\GAL4arm.PS, causes segmentation defects in the embryo. The T1 segment merges with T2, and T3 becomes partially fused with A1. Head morphology is normal and there are no visible homeotic transformations. Expression of ftzNTS.Scer\UAS, under the control of Scer\GAL4Dll-md23, causes deletion of the arista and truncation of the antennal 3 segment.