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Percent traumatic axonal injury (TAI) for five-day-old and four-week-old piglet brains. TAI in the four-week-old at one day post-injury was significantly higher than at 3–8 h post injury (#p=0.03). TAI in the five-day-old at one day was significantly higher than at 5–6 days (##p=0.003). Percentages for all groups were significantly higher than sham levels (*p<0.008). All values are mean±standard error of mean.
