Collectively, for the comparison PD-PSP, 5 proteins (TFF3, CPB1, OPG, CNTN1, TIMP4) remained significant (Figure 1A), while 4 (TFF3, CPB1, OPG, CNTN1) and 2 proteins (LAP/TGFβ1, ST1A1) remained significant in the comparison of PD-HC and PSP-HC, respectively (Figure 1B,C), after Bonferroni’s correction. Here, SULT1A1 is linked to Parkinson disease.