Fig. 2. Ed is colocalized with Nrg. Third instar larval eye discs were double-labeled with anti-Ed antibodies (green) and anti-Nrg monoclonal antibody 1B7 (red). Both Ed and Nrg are co-expressed in the basal undifferentiated cells (A-C) and in developing photoreceptor clusters (D-F). Scale bar: 10 µm.