DR GOPAL MURTI / SCIENCE PHOTO LIBRARY DR GOPAL MURTI / SCIENCE PHOTO LIBRARY
HeLa cells, confocal light micrograph. The cell nuclei, which contain the cells' genetic information, are blue. Mitochondria, a type of organelle, are green. Mitochondria oxidise sugars and fats to produce energy in a process called respiration. 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: x1000 when printed 10 centimetres wide.
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