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Immunohistochemical staining for human epidermal growth factor receptor-2 (HER-2) in rectal cancer cells. (a) No staining observed (0). (b) Faint staining detected in >10% of tumor cells (1+). (c) Moderate staining observed in >10% of tumor cells (2+). (d) Strong staining observed in >10% of tumor cells (3+). Magnification, ×400.
