Figure 2: Light microscopy. Hematoxylin and eosin stain shows fiber size variation and increased internal nuclei (A). Two fibers display central basophilic areas in hematoxylin and eosin stain (B, C). The focal areas are strongly reactive to nicotinamide adenine dinucleotide-tetrazolium reductase (NADHTR) (D). Bars, 50 um.