Expression of smo is governed by UAS regulatory sequences.
crossvein | ectopic, with Scer\GAL471B
When smoScer\UAS.cvdHa is driven by Scer\GAL471B, an extra crossvein is seen between wing veins L2 and L3 in 10-20% of progeny.
smoUAS.cvdHa/Scer\GAL4da.G32 rescues smo3