Figure 1. Immunohistochemical staining for COX-2 and survivin in adjacent sections of primary pterygium. The expression of both COX-2 (A) and survivin (B) was localized in the lower and middle layers of the epithelium. The immunoreactivity for survivin was localized to the nuclei and cytoplasm, while COX-2 expression was limited to cytoplasm. Note in A, COX-2-immunoreactive endothelial cells in the lamina propria. Each section was counterstained with hematoxylin. Original magnification; 400X.