Autoantibodies towards citrullinated proteins define a distinct clinical subtype of rheumatoid arthritis (RA). Here, the authors describe events triggering immunity against citrullinated proteins and argue that this immune response might be initiated outside the joint, pointing to the lungs as a possibly important site of initiation of these events.
- Anca I. Catrina
- A. Jimmy Ytterberg
- Lars Klareskog
