Fig. 1

RA Aetiopathogenesis. Environmental factors act upon genetic predisposition to cause breach of tolerance (transition A); Unknown factors act on an individual with pre-RA to trigger active RA (transition B); Treatment induces remission (transition C); Unknown factors trigger flare (transition D). Colours denote what is well investigated (green), the focus of the study (orange) and additional processes that this study could inform (pink)