COL9A2 and Parkinson disease: All 14 genes were expressed in Parkinson’s disease regions (> 1 TPM) and 8 of the genes (PPFIA4, NEFM, HCN2, ADRA2C, COL9A2, LRRC8D, EML2, and KDM7A/JHDM1D) had pronounced expression in Parkinson’s disease regions (> 35 TPM).