The expression of IL-4 by ILC2s was greater in patients with RA than in HCs (Figure 2(c)), but the expressions of IFN-γ, IL-9, IL-13, and IL-17A by ILC1s, ILC2s, and ILC3s were not altered significantly (Figures 2(b)–2(d)). Here, IFNG is linked to rheumatoid arthritis.