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Serum τ protein levels following TBI, shown as line diagrams with standard deviations. Serum τ protein levels increased soon after TBI and reached a peak ~2 days after the injury. The mean serum τ protein levels were significantly higher in the severe TBI group compared with those in the mild and moderate TBI groups. *P<0.05 and **P<0.0001, vs. mild and moderate TBI groups. TBI, traumatic brain injury.
