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Indirect immunofluorescence analysis of tissue removed in case 2. a Antibody staining (green color) demonstrates the tissue expresses cytokeratin 3, a protein typically associated with corneal epithelium. b Propidium iodide nuclear stain (red color) is used to identify cell nuclei. c Overlay of cytokeratin 3 antibody and propidium iodide nuclear stains demonstrates all cells express cytokeratin 3
