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The representative pattern of apoptotic cells by a TUNEL method in esophageal squamous cell carcinoma. (A) Apoptotic cells were detected by a TUNEL method using a biopsy specimen prior to treatment in the representative case (magnification, ×40). (B) Apoptotic cells were detected by a TUNEL method using the biopsy specimen following a radiation dose of 10 Gy in the same case (magnification, ×40).
