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Parafibromin stain in major renal epithelial tumors, × 400. A and B) ccRCC; parafibromin stain is negative in the tumor cells (B). C and D) pRCC; parafibromin stain is negative in the tumor cells (D). E and F) chRCC; there are diffusely and strongly parafibromin stains in the tumor cells (F). G and H) Oncocytoma; there are diffusely and strongly parafibromin stains in the tumor cells (H).
