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Immunohistochemical staining of RASSF1A in the normal tissue, adenoma, and tumor tissue. (a) Positive expression of RASSF1A in colonic epithelium (MaxVision, ×200). (b) Typical mixed nuclear/cytoplasmic immunostaining of RASSF1A in adenoma (MaxVision, ×200). (c) Negative expression of RASSF1A in colonic (or rectal) carcinoma (MaxVision, ×200).
