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Moderate intracytoplasmic COX-2 staining of a keratoacanthoma (KA) from the lateral body wall of a panther chameleon (Furcifer pardalis) (A). Strong intracytoplasmic COX-2 staining of the squamous cell carcinoma arising at the periphery of a KA with malignant transformation, obtained from the eyelid of a panther chameleon (B).
