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. 2017 May 26;88(10):818–824. doi: 10.1136/jnnp-2016-314857

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Plasma α-synuclein levels for all participants in the study. Plasma α-synuclein levels of normal controls and patients with PD. The plasma α-synuclein level was significantly increased in patients with PD compared with normal control subjects (p<0.001). PD, Parkinson’s disease. *, p<0.05; **, p<0.01.