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Figure 5: (a) Representative image of proliferative verrucous leukoplakia stained with cyclooxygenase-2 (×20) (b) Proliferative verrucous leukoplakia having progressed to squamous cell carcinoma stained with cyclooxygenase-2 (×20)

Figure 5: (a) Representative image of proliferative verrucous leukoplakia stained with cyclooxygenase-2 (×20) (b) Proliferative verrucous leukoplakia having progressed to squamous cell carcinoma stained with cyclooxygenase-2 (×20)