Fig. 3. Effects of overexpression of Deltex derivatives under the control of the ptc-GAL4 driver. Transgenic flies carrying the various UAS constructs expressing the Deltex derivatives were crossed to ptc-GAL4 or ptc-GAL4/CyO; A101/TM6B. (A-L) Adult wings and high magnifications of regions of wings. (M-R) The SOP cells in the third-instar wing discs are shown in green, and the Deltex derivatives are shown in red. An enhancer trap line, A101, was used to visualize the SOP cells. (A,G,M) Wild-type wing and disc. (B,H,N) Overexpression of Dx^full. Note a secondary wing margin-like structure (black arrowheads) and ectopic SOPs (white arrowhead). (C,I,O) Overexpression of Dx^NBS. Occasionally, a missing crossvein (white arrow) and a few extra bristles (white arrowhead) are observed. (D,J,P) Overexpression of Dx^PRM. Note the wing-notch phenotype. (E,K,Q) Overexpression of Dx^mRZF. (F,L,R) Overexpression of Dx^NBS-mRZF.