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Keratin expression patterns in the cultivated nasal mucosal epithelial cell sheet. Images show the immunofluorescence of keratin 4 (A1, B1, C1, D1), 13 (A2, B2, C2, D2), 3 (A3, B3, C3, D3), 12 (A4, B4, C4, D4), 1 (A5, B5, C5, D5), and 10 (A6, B6, C6, D6) in the nasal (A1–A6), corneal (B1–B6), conjunctival (C1–C6), and oral (D1–D6) cultured sheets. Scale bars = 100 μm. Abbreviations: K, keratin; PI, propidium iodide.
