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Immunohistochemical analysis of MCM4, MCM7, and Ki-67 in esophageal squamous cell carcinoma. A, MCM4 in squamous mucosa. B, MCM4 in esophageal squamous cell carcinoma. C, MCM7 in squamous mucosa. D, MCM7 in esophageal squamous cell carcinoma. E, Ki-67 in squamous mucosa. F, Ki-67 in esophageal squamous cell carcinoma.
