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Surface densities of PCNA-positive cells and the number of apoptotic cells at different stages (-x ± s, n = 6)
| Age | Surface densities of PCNA-positive cells | The number of apoptotic cells |
| Newborn group | 0 ± 0 | 0 ± 0 |
| Postnatal 3rd week | 0.022 ± 0.012 | 9.71 ± 2.43 |
| Postnatal 3rd month | 0.449 ± 0.063b | 38.83 ± 7.41b |
| Postnatal 1 year | 0.096 ± 0.045d | 11.36 ± 3.14d |
P < 0.01, vs Postnatal 3rd week.
P < 0.01, vs Postnatal 3rd month.
