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Morphology of gastrocnemius muscles in rats at 12 months after transplantation (hematoxylin and eosin staining, light microscope, × 200).
Varying degree of muscle degeneration, where polymorphic fibers and connective tissue increased, is seen instead of normal muscle fibers. Pathological changes in order of magnitude were as follows: FK506 + bone marrow mesenchymal stem cells group (A) > FK506 group (B) > autograft group (C).
