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Cytological Samples Classified into Three Groups According to the 2001 Bethesda System. A, negative for intraepithelial lesion or malignancy within normal limits; B, atypical squamous cells of undetermined significance (ASCUS); C, low-grade squamous intraepithelial lesion (LSIL); D, high-grade squamous intraepithelial lesion(HSIL) by Papanicolaou stain (x400)
