HSPA8 and Parkinson disease: The intracellular HSP70 pool was measured in intact PBMC (HSP70basal) of PD patients and age-matched non-PD controls (healthy donors (HD)) by flow cytometry using the antibody specific to a conservative epitope shared by constitutive Hsc70 and stress-induced Hsp70-1 proteins (Supplementary Figure S1a).