AGBL2 and rheumatoid arthritis: Furthermore, median anti-RgpB antibody levels did not differ between pre-RA subjects that were positive or negative for anti-CCP2 (1300 vs 1149 AU; p = 0.36), anti-CEP-1 (1374 vs 1118 AU; p = 0.16), anti-cFib (1300 vs 1112 AU; p = 0.22), anti-cVim (890 vs 1280 AU; p = 0.32) or RF (1139 vs 1280 AU; p = 0.77), and these subgroups did not differ from controls.