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Transmission electron micrographs of satellite cells (SCs) bordering a myofiber (my) in skeletal muscles from euthermic (A) and hibernating (B) dormice. In both seasonal phases, SC nuclei contain large amounts of heterochromatin (ch). (B) The accumulation of lipid droplets (L) in the myofiber is a typical feature of hibernating edible dormice [28]. Bars: 1 μm.
