Click on the mitosis in the image above:

A mitotic figure is seen here in the center, surrounded by cells of a poorly differentiated squamous cell carcinoma, with pleomorphic cells that have minimal pink keratinization in their cytoplasm. In general, mitoses are more likely to be seen in malignant neoplasms. Remember, though, that normal cells can be actively dividing in many tissues of the body, including skin, bone marrow, gonads, and gastrointestinal tract.