FOXP3 and Behcet disease: Intraperitoneal injection or oral administration of butyrate to BD mice couldn’t make any significant difference in the frequency of CD4+ cells (Figure 5F), but intraperitoneal injection of butyrate to BD mice increased the frequency of CD25+ cells (5.07 ± 1.40% vs.1.08 ± 0.34%) and Foxp3+ cells (6.07 ± 1.56% vs.2.32 ± 0.92%) compared to untreated BD mice (Figures 5G, H) but the results were not significantly different.