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Changes in pyknotic and mitotic indices of the external granular cells. (A) Pyknotic index, (B) Mitotic index. Control group, MTX-treated group. Values are expressed as means ± SE. *, **: Significantly different from control at P<0.05, P<0.01 (Student’s t-test). †, ††, †††: Significantly different from control at P<0.05, P<0.01 and P<0.001, respectively (Welch’s t-test).
