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Figure 2: Photomicrograph showing a tumor composed of stratified cylindrical cells with nuclear atypia and frequent mitoses (a, b, and c; H and E, 100, 400, and 400, respectively). Focal invasion into the underlying stroma is noted (d; H and E, 200)

Figure 2: Photomicrograph showing a tumor composed of stratified cylindrical cells with nuclear atypia and frequent mitoses (a, b, and c; H and E, 100, 400, and 400, respectively). Focal invasion into the underlying stroma is noted (d; H and E, 200)