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Figure 1 Human skeletal myoblast expansion and purity. A shows the anti-CD56 staining profile of the final myoblast product implanted to Patient 2 using flow cytometry. B (10x) and C (4x) show the myoblast cells in culture during expansion. D (10x) and E (4x) show the potential of these cells to fuse and form multinucleated myotubes in an in vitro assay. Some of these multinucleated myotubes are highlighted with arrows in D.