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(A) ∼ (C), no positive signal is detected in OLK. (D) ∼ (L), the representative positive signals are showed in mtOLK. (D) ∼ (F), tumor nest; (G) ∼ (I), vascular area; (J) ∼ (L), inflammation. FISH signals are visualized in green, while blue depicts nuclear DAPI stain. OLK, oral leukoplakia; mtOLK, malignant transformed oral leukoplakia.
