Fig. 6. The sub-cellular distribution of Wg protein in the Wg-producing cells is altered in ds mutant cells. (A,B) Third instar discs containing ds^38k clones generated by the Minute technique. Clones were induced during second instar and are marked by the absence of armZ (red). (A) In ds^38k cells, the gradient of extracellular Wg (green) is expanded with respect to the adjacent wild-type cells (arrowheads). (B) A cross-section from the region marked by the white line in A, showing a higher accumulation of Wg protein at the apical surface of ds mutant cells (compare with wild-type cells, red marker). Wg is uniformly distributed along the apical-basal axis. Note that the mislocalization of Wg also affects the wild-type cells adjacent to ds^38k mutant cells (bracket). Wg expression is shown in the green channel.