Fig 7. Box plots* of alpha-synuclein levels in native and acidified plasma.
(a) Younger in comparison to older individuals revealed higher alpha-synuclein levels, highly significant by Mann Whitney test for native, p = 0,0005 and acidified plasmas, p<0.0001. (b) Plasma acidification increased alpha-synuclein concentrations in both age groups, highly significant by a one-tailed Wilcoxon matched pairs test, p<0.0001. The additional horizontal short line in the box represents the mean.