ETNPPL and Parkinson disease: Among the under-expressed mRNAs in PD compared to controls (padj ≤ 0.05 and |FC| ≥ 1.5), we identified the ethanolamine-phosphate-lyase gene (ETNPPL/AGXT2L1), which resulted to be at the top of the list of genes differentially expressed obtained from the previous work (Tables 1 and 2 from [20]).