Fig. 6. Hh distribution in wild-type and cmn mutant discs. (A,A',A'') A wild-type wing disc expressing UAS-Hh under the control of hh-Gal4 was stained to visualize Hh (red) and Ptc (green) protein distribution. Hh staining can be detected in anterior compartment cells near the AP compartment boundary. In these cells Hh colocalizes with Ptc in intracellular vesicles (arrows). (B,B',B'') A cmn homozygous mutant wing disc expressing UAS-Hh under the control of hh-Gal4 was stained to visualize Hh (red) and Ptc (green) distribution. Hh staining can only be detected in P-compartment cells, with little, if any, staining in A-compartment cells.