We also measured the levels of IL-1β, IFN-γ, IL-2, IL-4, IL-6, IL-10, IL-12p70, IL-17A, TNF-α cytokines in PD and age/sex matched HC serum samples where sufficient sample was available (n = 7 PD, n = 11 HC). The gene discussed is IL4; the disease is Parkinson disease.