ALDH1A1 and Parkinson disease: The significantly deregulated proteins were matched to the transcriptomics results (Figure 4C,D), and the four most deregulated genes (up‐ and down‐regulated in PD) with their respective significant protein products were highlighted (up‐regulated: chitinase‐3‐like‐protein 1 (CHI3L1), DNAJB1, C1QC and SERPINA1; down‐regulated: ALDH1A1, ACTA2, TAGLN and DES; (|log2FC| > 1.4).