SNCA and Parkinson disease: To further examine this relationship, we tested the correlation of the different chaperone transcript subgroups with that of α-synuclein mRNA (SNCA) in four brain regions of young and aged (20 < 59, 60 > 80) men and women donors of the GTEx dataset (Fig. 1o, see Supplementary Table 1 for samples and conditions for PD patients, and Supplementary Table 2 for healthy donors from GTEx dataset, online resource).