Fig. 2From: DNA methylation mediates genotype and smoking interaction in the development of anti-citrullinated peptide antibody-positive rheumatoid arthritisThe associations between the genetic variant of rs6933349 and DNA methylation (cg21325723) in all individuals (a), and by smoking status (b), in the Epidemiological Investigation of Rheumatoid Arthritis (EIRA) study. Each dot represents an individual and red horizontal bars mark average DNA methylation levels. The statistical significance (P value) of association between genotype and DNA methylation, measured by linear regression model, is indicated at the bottom of the plotBack to article page