Fig. 3. Wing hair polarity after patterned ds misexpression. (A-C) Diagrams of hair polarity (red arrows) in adult wings. Approximate regions of Gal4-driven gene misexpression are shown in green. (A) Wild type. Veins are labeled as in Fig. 1, with the addition of the posterior cross vein (PCV). (B,C) Gradients of ds misexpression commonly reorient hairs from regions of high to low expression. (B) UAS-ds/+; salgal4/+. (C) UAS-ds/+; dllgal4/+. (D-F) Hair polarity in a region just distal to the PCV. (D) Wild type. (E) UAS-ds/+; salgal4/+. (F) sal-gal4/+; UAS-fz-GFP/+ induces multiple wing hair phenotype (arrowheads). (G,H) Redistribution of Fz-GFP (green, white) by Ds (red) in sal-gal4/+; UAS-ds/+ wing at 26 hours AP; region shown is posterior to the PCV. The normally distal (right) Fz localization within each cell has frequently changed to the posterior (H, arrowheads).