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Kinetic analysis of the expression of the four transgenes. The copy number of the mRNA of each gene was normalized to that of the housekeeping gene GAPDH. Data represent mean ± standard deviation (SD) of triplicate experiments. *P < 0.05, **P < 0.01, ***P < 0.001 as compared with the group of HFFs. (A) 1 week after transfection, (B) 2 weeks after transfection, (C) 3 weeks after transfection, and (D) 4 weeks after transfection.
