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Cardiomyocyte during acute ischemia (group III). (a) Mitochondria have easily visible crests. Few myelin structures and vacuoles in sarcoplasm (arrow). Magnification 6000x. Scale bar: 500 nm. (b) The irregular shape of myofilaments (arrow), but with well preserved structure of sarcomeres in the myocytes. Magnification 6000x. Scale bar: 500 nm.
