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Mitochondrion. Coloured scanning electron micrograph (SEM) of a sectioned mitochondrion from a cell. This structure, found in eukaryotic cells, is the site of energy production. There are two membranes: an outer surrounding membrane and an inner membrane that forms folds (cristae, yellow). Cristae are the sites of aerobic cell respiration, where sugars and fats are oxidised, which releases energy. Magnification: x68,000 at 6x7cm size.
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