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Daily brain derived neurotrophic factor (BDNF) levels over the first 7 days post-injury, compared to healthy controls (mean in black line, standard error in light gray dashed lines). (A) Daily mean CSF BDNF levels do not differ significantly from control levels. (B) Daily mean serum BDNF levels fall below control levels at day 0 post-injury and remain reduced through day 6 (day 0, p<0.05, day 1–6, p<0.001).
