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Fig. 1 A. The concept of in vitro - tissue engineering approach. B. The concept of in vivo - tissue engineering approach.

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Fig. 2 Y chromosome in situ hybridization of transplanted myoblasts. Positive nuclei of syngeneic male donor rats indicated by arrows. A + B) 2 days after transplantation: fibrin matrix still present (host muscle fibers of gracilis muscle indicated by arrow heads, fibrin matrix is indicated by hollow arrow heads); C) 14 days after transplantation: male myoblasts fused with female host myofibers of the gracilis muscle; D) 50 days after transplantation: male myoblasts fused with female host myofibers of the gracilis muscle, resulting in several mosaic multinuclear muscle fibers, consisting of cells of male and female origin.

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Source: J. Cell. Mol. Med. Vol 8, No 4, 2004 pp. 413-422