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Microtubules apparently guide nanotunnels. (A and B) Ultrathin section of rapidly frozen cardiomyocyte. Microtubules (in purple) are very close to mitochondrial profiles and are oriented following the direction/orientation of nanotunnels. (C–H) Selected images from two tomograms showing microtubules that accompany nanotunnels (red and green in C–E and yellow in F–H) (Movie S7).
