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The cellular size (a), nuclear size (c), and NC ratio (e) of the basal cells. A significant positive correlation was shown between age and the cellular area (b; correlation coefficient r = 0.940) as well as between age and the nuclear area (d; correlation coefficient r = 0.911) of basal cells; **P < 0.0001. No significant correlation was found between age and NC ratio (f); NS, no significance.
