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Correlations of serum and EDTA-plasma BDNF concentrations for time points (A) “2 hrs storage at room temperature” (T2), (B) “After 2nd freeze/thaw cycle” (T3), (C) “2 months storage at −80 °C” (T4), (D) “6 months storage at −80 °C” (T5). BDNF: brain-derived neurotrophic factor, EDTA: ethylenediaminetetraacetic acid, hrs: hours.
