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Quartile distributions for anti-OmpC, anti-I2, anti-Cbir1, and ASCA IgG and IgA. Each colored section of the bar represents approximately 40 patients from all the subjects in the study, both ankylosing spondylitis patients and controls. anti-CBir1 = anti-flagellin; anti-OmpC = anti-Escherichia coli outer membrane porin C; ASCA = Anti-Saccharomyces cerevisiae antibody.
