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Electron microscopic images of the ultrastructure of a left ventricular cardiomyocyte from a 6-month-old naked mole rat: (a) General view photo at low magnification. Long rows of mitochondria along myofibrils are visible. Arrows show mitochondria located within a sarcomere. (b) Ultrastructure of a single mitochondrion at higher magnification. Arrows show the electron-dense granules in the matrix. N—cardiomyocyte nucleus.
