The FBM is required for Crb's function in regulating Hippo signaling. In all panels, mutant clones (GFP-negative) are indicated with arrows. Eye discs containing crb (A–A″), kibra (B–B″), kibra crb (C–C″), kibra crbΔFBM (D–D″), and kibra crbΔPBM (E–E″) clones were stained for ex-lacZ (red). Note elevated ex-lacZ levels in kibra crb and kibra crbΔFBM, but not in crb, kibra, or kibra crbΔPBM clones.