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O‐GlcNAc transferase (OGT) expression in rat tissues. Immunohistochemical staining of OGT revealed weak nuclear positivity in nonneoplastic squamous epithelium of the upper esophagus of the reflux model (A). Conversely, the staining of OGT revealed strong nuclear and weakly cytoplasmic positivity in both ESCC and mucinous adenocarcinoma cells (B,C). Scale line = 200 μm
