Fig. 2. Wing phenotypes produced by ectopic expression of different combinations of Sog, Tsg and Tld. (A) Wing from a fly expressing the A9-Gal4 driver alone. (B) Wing from a A9-Gal4>UAS-atld (activated Tld) fly. There is some loss of margin bristles but all veins form normally. (C) Wing from a A9-Gal4>UAS-sog, tsg fly. Wings are smaller and most veins are missing. (D) Wing from a A9-Gal4>UAS-sog, tsg, atld fly. Note that wing size is close to normal and the formation of most veins is recovered.