Fig. 7. Deletion of 530 bp including PSE2 in the endogenous en gene leads to abnormalities in the posterior compartment in wings. (A) Wild-type wing. (B) Wing from en⁵³⁰ homozygotes. Arrows indicate the intersection of the anterior crossvein with the IV longitudinal vein where a defect is seen in the en⁵³⁰ homozygotes. Arrowheads indicate the intersection of longitudinal vein with the wing margin. This vein splits before the intersection with the margin in en⁵³⁰ homozygotes.