For example, Li et al. studied the prevalence of Th1, Th17, and Th22 cells in GBS compared to controls and other conditions and found that GBS patients had increased frequency of Th1, Th17, and Th22 cells in their circulation along with elevated IL-17 and IL-22 in their serum (Li et al., 2014). The gene discussed is IL17A; the disease is Guillain-Barre syndrome.