PRR14 and Parkinson disease: The expression data of PRR14 in the whole blood sample (P = 0.003, Online Resource Fig. a) (Scherzer et al. 2007), substantia nigra (P = 0.001, Online Resource Fig. b) (Lesnick et al. 2007), and medial substantia nigra (P = 0.001, Online Resource Fig. c) (Moran et al. 2006) from PD patients and the normal controls (NC) were extracted from the GEO database.