Anti-cyclic citrullinated peptide antibody levels in rheumatoid arthritis patients and comparison groups. Anti-cyclic citrullinated peptide (anti-CCP) antibody responses are shown in age-similar healthy hospital personnel, patients with connective tissue diseases and early and late rheumatoid arthritis patient groups. Mean values and standard errors of the mean are shown, and the shaded region represents negative values.
Arvikar et al. Arthritis Research & Therapy 2013 15:R109 doi:10.1186/ar4289