In the course of RA, these include the interleukins IL-1, IL-6, IL-22, and IL-23, the chemokines CXCL11 and CXCL13, and TNF-α, whereas in the course of PsA, the interleukins IL-17, IL-22, IL-23, IL-1β, IL-6, interferon-γ, and TNF-α are responsible for inflammation [1]. Here, IL22 is linked to rheumatoid arthritis.