Substantia nigra tissue from postmortem brain of normal and Parkinson disease patients were used for RNA extraction and hybridization on Affymetrix microarrays: 9 replicates for the controls and 16 replicates for the Parkinson's disease patients were used. Both cohorts included males and females. Data available from the gene expression omnibus (GEO) database: https://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSE7621 Paper published with PLOS Genetics: https://journals.plos.org/plosgenetics/article?id=10.1371/journal.pgen.0030098