CD79A and colitis: We next studied the clinical relevance of the percentage of IgA- and IgG-coated bacteria to disease behaviors in UC patients, and found that the percentage of IgA-coated bacteria increased in patients with left-side colitis (E2), while E2 UC and patients with extensive colitis (E3) displayed higher percentage of IgG-coated bacteria compared with healthy controls (Fig. 8a).