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Representative photomicrographs of FAK immunostaining in highly aggressive subtypes of thymic epithelial tumor. FAK was overexpressed in (A) type B2 and (B) type B3 thymomas, and in (C) thymic carcinoma (magnification, ×200). (D) A high-power view of FAK overexpression in thymic carcinoma epithelial cells, demonstrating the intense membrane and cytoplasmic immunoreactivity for FAK (magnification, ×400). FAK, focal adhesion kinase.
