After 6 days, levels of IL26 expression were highest with a combination of classical Th17-favoring cytokines IL-1β and IL-23 relative to basal stimulation with IL-2 only (Figure 3A; HCs, axSpA, PsA: p < 0.001; RA: p < 0.01). The gene discussed is IL2; the disease is rheumatoid arthritis.