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H&E and immunohistochemical staining of biopsy specimens taken during peroral pancreatoscopy (POPS). (A) H&E staining; (B) MUC-1 staining; (C) MUC-2 staining; (D) MUC-5AC staining. The lesion was negative for MUC-1 and positive for MUC-2 and MUC-5AC and was classified as the intestinal type.
