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Immunofluorescence double staining with anti‐pan‐cytokeratin and anti‐green fluorescent protein (GFP) antibodies in esophagitis mucosa (a), and in squamous cell carcinoma (b). Pan‐cytokeratin was stained for red and GFP for green. A few cells in esophagitis mucosa and in carcinoma showed GFP positivity and cytokeratin positivity.
