Figure 3. Pig retinal cryosections labeled immunohistochemicaly for the GCL protein markers. A: Only ganglion cells are labeled for Brn3a in GW9 retina. B: Ganglion cells are Brn3a-positive in 1W retina. C: Cells in the GCL (thick arrows), IPL, some developing amacrine (thin arrows) and horizontal cells (arrowheads) are positive for NF-160 in GW9 retina. D: GCL, neurofiber layer, and processes in IPL and OPL are NF-160-positive in 1W retina. E: Weak labeling for AP2α in the GCL (thick arrows) and prospective INL (thin arrows) is present in GW9 retina F: Cells in the GCL and amacrine cells in the INL are APα2-positive in 1W retina. Nuclei are labeled with PI (red).