Fig. 1. deltex and Notch are required for the normal development of the wing margin. (A) Wild-type adult wing. The wing veins III and IV are indicated by arrowheads (see D). (B) deltex/Y wing. (C) Notch54l9/+ wing. (D) Protein expression from a UAS responder line under the control of the ptc-GAL4 driver. UAS-GFP was crossed to ptc-GAL4, and wing discs of the third-instar larvae were stained with mouse anti-Delta antibody. GFP and Delta are shown in green and red, respectively. Presumptive cells of wing veins III and IV expressing Delta are indicated by arrowheads.