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Immunohistochemical analysis. (a) Immunohistochemical analysis showing highly proliferative neoplastic epithelium for Ki67. (b) Immunohistochemical analysis showing strong immunoreactivity for CK 14. (c) Immunohistochemical analysis showing strong immunoreactivity for CK 5 and 6. (d) Immunohistochemical analysis showing focal central immunopositivity in stellate reticulum for calretinin
