A: Concentration of dopamine in the caudate and putamen from patients with diseases (PD: n=10, PDD: n=7, DLB: n=10, AD: n=26) and age-matched controls (n=10). Value shown are means ± SEM. B: Concentration of dopamine vs level of 8-oxo-dG in the caudate from diseases brains, significantly association was observed only in AD group (p = 0.026). C: Concentration of dopamine vs VMAT2 expression in the putamen from diseases brains, significantly association was observed only in DLB group (p = 0.050). rs, the Spearman’s rank correlation coefficient.