ART4 and inflammatory bowel disease: The geometric means of IgG anti-S glycoprotein antibody concentrations in IBD patients on anti-TNFα agents were lower than those in patients on other treatment regimens, 858.6 BAU/mL [332.6–2216.5] vs. 2612.7 BAU/mL [1999.6–3413.7] (p = 0.008), respectively (Figure 3A).