Figure 6.—

Dl expression in the vein 4 primordium is in the posterior compartment. (A) A wild-type wing imaginal disc showing stripes of Dl expression in veins 3, 4, and 5 primordia. (B–D) High magnification of the AP organizer region in the dorsal wing pouch. Veins 3 and 4 stripes of Dl expression (red) flank the AP border indicated by arrowheads. Expression of Ci (green) marks the cells of the anterior compartment. The Dl vein 3 stripe is anterior of the border, while the vein 4 stripe is posterior and directly adjacent to the border. (A and B–D are from two different discs.)