Fig. 1. Representative immunohistochemistry staining for nuclear factor erythroid 2-related factor 2 protein expression in paraffin-embedded colorectal cancer tissue (A, B) and normal tissue (C, D). (A, B) Some of the tumor cells show positive cytoplasmic staining for Nrf2 (A: ×100, B: ×200). (C, D) Normal mucosa of colon shows negativity for Nrf2 (C: ×40, D: ×100).
