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Physical interactions between SS and IMF mitochondria. Transmission electron micrograph of myofibers in the transverse plane. A: SS and IMF mitochondria are distinct organelles. B and C: some SS and IMF mitochondria form continuous organelles (arrowheads) that coexist in both subcellular compartments. SS, subsarcolemmal; IMF, intermyofibrillar; PM, plasma membrane (sarcolemma); Myofibr, Myofibrils; Cap, capillary.
