HeLa cell division. Coloured scanning electron micrograph (SEM) of a HeLa cell undergoing the final stage of cytokinesis (cell division). Cytokinesis occurs after nuclear division (mitosis), which produces two daughter nuclei. The two daughter cells are still connected by a midbody, a transient structure formed from microtubules (orange, centre). HeLa cells are a continuously cultured cell line of human cancer cells, which are immortal and so thrive in the laboratory. They are widely used in biological and medical research. Magnification: x1700 when printed at 10 centimetres tall.
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