Fig. 4. lqf genetically interacts with Delta during wing vein formation. Dorsal views of wild-type (A,B), Dl³/+ (C,D) and Dl³+/+lqf^ARI (E,F) wings. (A,B) Wild-type patterns of the L2 vein (A) as well as of the L5 vein and posterior cross vein (PCV) (B). (C) Dl³/+ wings exhibit vein thickening at the tip (arrowhead) and along the length (arrow) of L2. (D) Dl³/+ wings also exhibit thickening of L5 (arrow) and vein bifurcation at the junction of the posterior cross vein and L5 (arrowhead). (E,F) Dl³+/+lqf^ARI wings exhibit severe vein thickening at the tip and along the length of L2 (E; arrow, arrowhead) as well along L5 (F, arrow). The bifurcation of the L5 and posterior cross vein is also more severe in Dl³+/+lqf^ARI wings (F, arrowhead). The percentage of flies of indicated genotype that exhibit noted phenotypes is given in the bottom right of each panel. Proximal – right.