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The effect of different concentrations of Valproic acid (VPA) (means ± SD) at 24, 48 and 72 hr on telomerase activity. The level of telomerase activity significantly decreased at 48 hr (*P<0.05 and **P<0.005) and 72 hr (#P<0.05 and ##P<0.005) compared to 24 hr treatment. Telomerase activity at 48 hr was not significantly different from that of 72 hr treatment
