DNA methylation levels (mean ± SEM) at seven cytosine-guanine dinucleotide (CpG) sites (Region 1) and at five cytosine-guanine dinucleotide (CpG) sites (Region 2), within the human A2AR gene promoter, in PBMCs of control (n = 22), and PD subjects (n = 25). Here, ADORA2A is linked to Parkinson disease.