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The limited proliferative capacity of DMD myoblasts severely limits their ability to be genetically modified and used for myoblast transplantation. Transformation by SV40 large T antigen (Tag) delays senescence of mouse and human myoblasts but fails to immortalize these cells. The cells ceased to proliferate and entered into crisis. Reconstitution of telomerase activity has been shown sufficient to enable different types of transformed cells to escape crisis. DMD myoblasts, previously transformed by Tag, were therefore infected with a telomerase retrovirus. The expression of telomerase was

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