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Estimate of change in cell cycle time in young adult and senescent mice. The average number (±SEM) of cells double-labeled as a percentage of total numbers of cells proliferating at t = 0 were obtained from four hemisections from each of two 2- to 4-months-old mice and two hemisections from each of three 23- to 25-months-old mice. * Significantly different from control (p < 0.05).
