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A, Contractile parameters, including percent shortening, velocity of contraction, velocity of relaxation, and τ(time course of relaxation as a function of increasing extracellular calcium), in human cardiomyocytes infected with Ad.asPL (n = 6), Ad.SERCA2a (n = 6) or Ad.βgal-GFP (n = 8). B, Tabulated effects of isoproterenol in human cardiomyocytes infected with either Ad.βgal-GFP or Ad.asPL (control, n = 5; +isoproterenol, n = 14). *P < 0.01 compared with Ad.βgal-GFP.
