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a Keratinizing squamous cell carcinoma (hematoxylin and eosin, 200×). b Non-keratinizing squamous cell carcinoma (hematoxylin and eosin, 200×). c Hybrid morphology-both keratinizing and non-keratinizing (hematoxylin and eosin, 200×). d Oral squamous cell carcinoma with koilocytes (hematoxylin and eosin, 200×)
