Figure 4.

Expression pattern of WG (A–F) and CT (I) (red) in wing discs with clones of Dl-expressing cells (green, GFP); clones of wg-expressing cells (G and H) (blue, β-galactosidase). In A–F, different examples of clones of Dl-expressing cells. In A, C, D, and F, dorsal clones express high levels of WG within the clone as well as in the wild-type cells adjacent to the clone (arrowhead in C). In B, C, E, and F, the clones in the ventral compartment that abut the external and internal rings of WG expression cause large outgrowths with elongation of the internal ring of WG expression (arrows in C). High levels of WG in some cells within the clone can be observed (arrows in E and F). In G and H, clones of wg-expressing cells in the wing blade never cause outgrowths, whereas they do in notum and wing base (H). In I, compare the small size of clones of Dl-expressing cells closer to the d/v boundary with the large ones in the proximal region of the wing.