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Cardiomyocyte during induced acute ischemia (group II). (a) The enlarged intercellular space within intercalated discs (arrow). The myelin-like structures in sarcoplasm. Magnification 10000x. Scale bar: 500 nm. (b) Fusion of mitochondria, formation of giant mitochondria, and myelin-like structures within cardiomyocyte cytoplasm (arrow). Magnification 6000x. Scale bar: 500 nm.
