Fig. 2. The expression of Dally and Dlp in the wing disc. All discs are oriented dorsal upwards, anterior leftwards. (A-B') Dally and Dlp expression in third instar wing imaginal discs visualized by dally-lacZ expression (green in A and A') and Dlp staining (green in B and B'), respectively. The AP and DV compartment boundaries are visualized by Ci staining (blue in A' and B') and Wg or wg-lacZ expression (red in A' and B'), respectively. (C-D') Dlp staining (green) in discs carrying random clones expressing either the active form of Arm (Arm^act) (C,C') or the dominant-negative form of TCF (TCF^DN) (D,D'). The clones are marked by GFP (red) and outlined with broken lines. The expression of Dlp is reduced in clones expressing Arm^act, and increased in clones expressing TCF^DN. (E-F') Dlp staining (red) in discs carrying dsh clones (E,E') or a large notum clone covering the entire A compartment (F,F'). Both dsh and notum mutant cells are marked by the absence of GFP (green) (E',F'). Dlp levels are increased in dsh clones, but not altered in the absence of notum function.