While a strong correlation was also seen between PD and PSP, we identified 11 proteins (SLC35A4, FTH1, MICOS10, SAR1B, RAB2A, CDC42, RHOA, GNA13, RAB35, YKT6, VPS13C) upregulated in PSP but downregulated in PD (and in MSA). The gene discussed is CDC42; the disease is Parkinson disease.