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Representative photomicrographs of immunohistochemical staining for CD44, MMP-2, and MMP-9 in papillary renal cell carcinoma (IHC, ×400). (A) Weak staining intensity for CD44, (B) intermediate staining intensity for CD44, (C) strong intensity for CD44, (D) Weak staining intensity for MMP-2, (E) intermediate staining intensity for MMP-2, (F) strong intensity for MMP-2, (G) Weak staining intensity for MMP-9, (H) intermediate staining intensity for MMP-9, (I) strong intensity for MMP-9.
