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Differentiation of corneal epithelium in vitro and in vivo determined by immunohistochemistry for cytokeratin 3/12 (CK3/12, A) and plakoglobin (PKG, B). HOC, human orthotypical cornea; HHC, human heterotypical cornea. Controls are normal human corneas (CTRh) and normal rabbit corneas (CTRr). Scale bars: 100 μm.
