Anti-citrullinated fibronectin peptide antibodies in relation to anti-CCP2 positivity. The peptide set FN-Arg/Cit1035,1036 was used to study the presence of anti-FN antibodies in anti-CCP2 positive (n = 138) and anti-CCP2 negative (n = 28) RA sera. The broken line indicates the cut-off value (mean + 2*SD of data obtained with normal human control sera); OD450 = optical density at 450 nm.
van Beers et al. Arthritis Research & Therapy 2012 14:R35 doi:10.1186/ar3744