Figure 5. Immunochemistry of vascular endothelial growth factor in a retina. Sections of retina were examined by immunohistochemistry with anti-vascular endothelial growth factor (VEGF) antibody. Positive staining (brown) of VEGF was detected in retinal vessel walls in the central retinal vein occlusion groups (A: group “1 w,” B: group “2 w,” C: group “24 w”). There was no obvious positive staining after intravitreal bevacizumab (IVB) injection (D: group “1 w+IVB,” E: group “2 w+IVB,” F: group “24 w+IVB”).