Fig. 3From: Association of levels of antibodies against citrullinated cyclic peptides and citrullinated α-enolase in chronic and aggressive periodontitis as a risk factor of Rheumatoid arthritis: a case control study a, b Boxplots of anti-CEP-1 plasma levels in dependence on expression of HLA-DQB1*06 (a) and HLA-DRB1*13; DRB3*; DQB1*06 (b). The medians of anti-CEP-1 plasma levels between the groups were compared using Mann–Whitney U test.Back to article page