CD69 and rheumatoid arthritis: To conclude, we have characterized three distinct CD8+CD69+CD103+ TRM cell populations within the inflamed arthritic joint: cytotoxic and Treg-like TRM cells, which are present in the synovial joint of patients with both PsA and RA, while type 17-like TRM cells, as well as type 17-like CD8+CD103− T cells, are specifically enriched in the synovial joint of patients with PsA.