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. 2021 Nov 8;13:759182. doi: 10.3389/fnagi.2021.759182

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Copyright © 2021 Chang, Liu, Lai, Yang and Chen.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Levels of α-synuclein and NFL in the plasma of patients with PD and HCs. (A,B) Plasma levels of α-synuclein in patients with PD (n = 42) and HCs (n = 40) in K₂-EDTA tubes centrifuged at (A) RT or (B) 4°C. (C,D) Plasma levels of NFL in patients with PD and HCs in K₂-EDTA tubes centrifuged at (C) RT or (D) 4°C. (E,F) Plasma levels of hemoglobin in patients with PD and HCs in K₂-EDTA tubes centrifuged at (E) RT or (F) 4°C. Error bars represent SD. Comparisons by Student’s t-test.