Figure 3.

Immunohistochemical staining of positive control (G1) tissue using antibody against COX-2. Immunoreactivity was present throughout the epithelial cells (100× magnification) (1). Immunohistochemical staining of G2 tissue using antibody against COX-2 showing weaker staining compared to G1 (100× magnification) (2). Immunohistochemical staining of negative control (G5) tissue using antibody against COX-2 (100× magnification)(3).