Fig. 5. Wg and its target genes. (A-D) Wg (A; shown in green) is produced along the DV border and induces the expression of target genes, such as Ac (B; yellow, and expressed only in the A compartment), Dll (C; purple) and Vg (D; red), at high, middle and low thresholds, respectively. Anterior is to the left. (E) Schematics showing the domains of target gene expression. Reproduced with permission from Briscoe et al. (Briscoe et al., 2001).