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ELISA detection of BDNF in lumbar CSF samples after intrathecal injections of BDNF or PEG-BDNF. * and ** indicate p values < 0.05 and <0.005, respectively, for time-matched PEG-BDNF compared to BDNF (unequal variance two-tailed t-test, error bars are standard error of the mean).
