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Light microscopy and immunohistochemistry (IHC) of EXT1/EXT2-negative LMN. (A–C) Top panel showing pure class 5 LMN, (D–F) and bottom panel showing class 5 LMN with class 3 proliferative LN. (B and E) IHC for EXT1 (×40 magnification). (C and F) IHC for EXT2 (×40 magnification).
