GPBAR1 and Behcet disease: The expression of FXR at the protein level (0.98 ± 0.07 vs. 0.57 ± 0.15, P = 0.002) and mRNA level (2.65 ± 0.52 vs. 0.98 ± 0.25, P = 0.004) in the BD group increased, whereas that of TGR5 showed no significant change at the protein level (0.85 ± 0.13 vs. 0.95 ± 0.06, P = 0.209) and mRNA level (1.02 ± 0.27 vs. 1.01 ± 1.32, P = 0.956, Figure 4B).