T1 beard | ectopic, with Scer\GAL4arm.PS
Embryos expressing ScrHis-12A.Scer\UAS.T:Ivir\HA1 under the control of Scer\GAL4arm.PS show a characteristic transformation of the second and third thoracic segments towards the identity of the first thoracic segment, as seen by ectopic T1 beard formation in these segments. The anterior abdominal segments (A1 to A3) also show a weaker transformation towards T1.