CD79A and irritable bowel syndrome: In our patient cohort, the serum IgA AZA levels were significantly higher in patients with CD (median, 0.35 (range, 0–8.1); mean, 1.25) than in IBS patients (median, 0.0 (range, 0.0–5.94); mean, 0.24; p < 0.001) or HCs (median, 0.03 (range, 0.0–5.23); mean, 0.22; p < 0.05; Figure 1).