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Expression of (A) cytokeratin 13 (CK13) and (B) CK17 in skin, and (C) CK13 and (D) CK17 in cholesteatoma tissues. Expression of CK17 was much increased in cholesteatoma (arrows) compared to the skin but CK13 did not show much difference in both skin and cholesteatoma tissues (Mayer’s hematoxylin, ×200).
