NATIONAL INSTITUTES OF HEALTH / SCIENCE PHOTO LIBRARY NATIONAL INSTITUTES OF HEALTH / SCIENCE PHOTO LIBRARY
HeLa cells, multiphoton fluorescence micrograph (MFM). The cell nuclei, which contain the cells' genetic information, are purple. Microtubules are blue and actin microfilaments are red. Microtubules and actin are protein filaments that make up part of the cytoskeleton. The cytoskeleton maintains the cells' shape, allows some cellular mobility and is involved in intracellular transport. 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.
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