T1 beard | ectopic, with Scer\GAL4arm.PS
When ScrScer\UAS.T:Ivir\HA1 is expressed ubiquitously throughout the embryo under the control of Scer\GAL4arm.PS, ectopic hairs similar to those found in the first thoracic (T1) segment (called the T1 beard) were observed in additional segments.
Embryos expressing ScrScer\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.