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Ultrastructure of individual cardiomyocyte mitochondria in a 11-year-old naked mole rat: (a) Mitochondria with disrupted crista ultrastructure. The arrow shows the appearance of a bundle of cristae. (b) The bundle at higher magnification. (c) Mitochondrial population of a left ventricular cardiomyocyte. Mitochondria with bundles are very rare.
