DNAJA2 and rheumatoid arthritis: The presence of elevated levels of antibodies against the E. coli DnaJ has been shown in RA (Albani et al. 1994, 1995; Chukwuocha et al. 1999; Tukaj et al. 2010a), with especially high response to the conserved J domain of DnaJ (Albani et al. 1995; Tukaj et al. 2010a).