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Immunohistochemical staining was carried out on paraffin-embedded 4 μm sections, and representative patterns of RARβ protein expression in colorectal cancer (a) and peritumoral tissue (b) are shown. In colorectal cancer tissues, no expression was observed (A1 and A2). In adjacent normal colorectal tissues, high RARβ expression was observed (B1 and B2). A1 and B1: original magnification ×40 (bar = 500 μm): A2 and B2: ×400 (bar = 50 μm).
