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A. normal anal Pap with intermediate and basal squamous cells and glandular cells (Pap stain, 400×); B. AIN1, showing a koilocyte with a prominent perinuclear cavity (Pap stain, 400×); C. AIN 3, displaying increased nuclear:cytoplasmic ratios and irregular hyperchromatic nuclei (Pap stain, 400×)
