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Examples of immunohistochemical staining of S100A9 in clear cell renal cell carcinoma. (A) Low S100A9 expression. Tumor cells show weaker expression compared with capillary endothelial cells (B) High S100A9 expression. Tumor cells reveal stronger expression compared with capillary endothelial cells (arrow, endothelial cells; arrow head, tumor cells; original magnification: 200×).
