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Pathological section of benign and malignant lung cancer. (A) benign nodules, (B) squamous cell carcinoma of the lung, (C) adenocarcinoma of the lung, and (D) small cell lung cancer; A1,B1,C1,D1) 40× under the microscope, A2,B2,C2,D2)100× under the microscope, A3,B3,C3,D3) 400× under the microscope.
