TLR9 and arthritic joint disease: In this model, arthritis could be transferred into naïve recipients with T cells that had been re‐activated in vitro by the nucleic acid binding protein hnRNP‐A2/B1 or ligands (nucleic acids) of TLR3, TLR7 or TLR9.19 Interestingly, disease transfer was inhibited by chloroquine or pre‐treatment of cells with nucleases.