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Relationship between α-synuclein levels in plasma or serum samples and clinical severities [modified Hoehn and Yahr stage (H-Y stage)] among patients with early Parkinson's disease (modified H-Y stage from 1 to 3). (A) No correlation was detected between α-synuclein levels in plasma samples and modified H-Y stage. (B) α-synuclein levels in serum samples and modified H-Y stage were correlated.
