In contrast to previous studies in 2 well‐documented Swedish cohorts, we observed no association of anti‐RgpB with CCP‐2–positive RA, nor did we observe elevated anti‐RgpB levels in RA patients compared to OA patients, or in CCP‐2–positive RA patients compared to CCP‐2–negative RA patients 35, 51. The gene discussed is AGBL2; the disease is rheumatoid arthritis.