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Figure 1: (a) Representative image of proliferative verrucous leukoplakia stained with Ki-67 (×20) (b) Proliferative verrucous leukoplakia progressed to squamous cell carcinoma stained with Ki-67 (×20)

Figure 1: (a) Representative image of proliferative verrucous leukoplakia stained with Ki-67 (×20) (b) Proliferative verrucous leukoplakia progressed to squamous cell carcinoma stained with Ki-67 (×20)