GFAP and Parkinson disease: In this study, we utilized the NULISA CNS Disease Panel 120, which includes validated AD biomarkers (p-tau217, p-tau181, TREM2,) alongside key proteins associated with PD (SNCA, pSNCA-129), FTD (TDP-43), and general neurodegeneration (NEFL, GFAP, NRGN, SMOC1).