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Electron‐dense structures between mitochondria (M) and both junctional and network sarcoplasmic reticulum (SR) as well as T‐tubules (T). Representative electron tomographic micrographs highlighting the presence and similarity of electron‐dense structures connecting T‐tubules and SR (red arrows: ryanodine receptors), SR and mitochondria (blue arrows) and T‐tubules and mitochondria (green arrows). Scale bars: 50 nm.
