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Immunohistochemical detection of sLea in CCA. A: A CCA case with no sLea expression in tumor but with positive staining in the normal bile ducts (arrows); B: and C: CCA cases with positive sLea, showing apical and stromal staining, respectively; D: Vascular metastasis of sLea positive CCA cells. (Immunoperoxidase staining, original magnification ×100).
