DR GOPAL MURTI / SCIENCE PHOTO LIBRARY DR GOPAL MURTI / SCIENCE PHOTO LIBRARY
Cell division. Confocal light micrograph of a HeLa cell during cytokinesis (cell division). Cytokinesis occurs after nuclear division (mitosis), which produces two daughter nuclei (purple). The yellow structures are microtubules, part of the cell's cytoskeleton. Along with actin filaments, microtubules separate the chromosomes during mitosis. HeLa cells are a continuously cultured cell line of human cancer cells. They are immortal and so thrive in the laboratory. HeLa cells are widely used in biological and medical research. Magnification: x2400 when printed 10 centimetres wide.
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