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Histogram of the intensity of nestin staining (mean grayscale value) indicating endogenous neural progenitor cells around the ependymal layer of the central canal across the lesion, at 24 h, 1, 2, and 6 weeks post-injury. Using two-way ANOVA there was a significant difference (P < 0.005) in both main effects, age and survival time. Significant differences (P < 0.005) are shown between groups based on Bonferroni's post-hoc test.
