In addition to a TNF‐driven arthritis model, we also evaluated the importance of the microbiome for arthritis development in the IL‐1β‐dependent myeloid‐specific A20‐deficient (A20myel‐KO) mouse model of arthritis (Matmati et al, 2011; Walle et al, 2014). The gene discussed is TNF; the disease is arthritic joint disease.