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Figure 2 Serial sections of transplanted area at the age of 17 weeks (six weeks after transplantation). Left panel shows hematoxylin-eosin (H-E) staining. Multinuclear elongated structure is typical of myotubes (arrows). Right panel shows immunohistochemical staining for skeletal-specific myosin heavy chain by MY-32. Positive staining with MY-32 demonstrates the presence of myotubes (arrows). Original magnification, x400.