Fig. 4.

Rescue of fz^P21 Dfz2^C2 cells in Dfz3^G10 wing imaginal discs by ΔCRD forms of Fz and Dfz2. (A and B) Rescue of Wg transduction in fz^P21 Dfz2^C2 clones in Dfz3^G10 larvae by Tubα1-fz^ΔCRD or Tubα1-Dfz2^ΔCRD (analyzed as twin spots, as in Fig. 3 G–J). (A–D) Clones are marked black by the absence of GFP; Dll is stained in red. (C and D) Rescue of Wg transduction in fz^P21 Dfz2^C2 clones in Dfz3^G10 larvae by Tubα1-fz^ΔCRD or Tubα1-Dfz2^ΔCRD by using the Minute technique: Mutant clones have a competitive growth advantage and generally populate most of the developmental compartment in which they reside. (E and F) Wing discs from Dfz3^G10; fz^P21 Dfz2^C2/fz^P21 Dfz2^– larvae rescued to the late third instar by the presence of a single Tubα1-fz^ΔCRD or Tubα1-Dfz2^ΔCRD transgene. Dll (red) is expressed normally in a broad stripe flanking Wg-secreting cells (blue) along the dorsoventral compartment boundary [discs are of normal size but are shown at lower magnification than in A–D (see Materials and Methods)].