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Representative results of immunohistochemical staining for ALK in non-small cell lung carcinomas. ALK protein expression was detected with 5A4 anti-ALK monoclonal antibody by the intercalated antibody-enhanced polymer method. A, B, C, D and E are the adenocarcinomas in cases No. 2, 5, 6, 8 and 10, respectively. F is the adenocarcinoma which showed no ALK expression. Bar, 50 μm.
