HeLa cells. Confocal light micrograph of HeLa cells that have been labelled for the cytoskeletal protein actin (green). 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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