VDR and inflammatory bowel disease: The DAI scores at day 6 were 4.5, 8.8, and 10.2 for DSS-treated wild-type, Vdr(+/−), and Vdr(−/−) mice, respectively (Figure 2D and Figure 3D), which is consistent with the previous reports that Vdr(−/−) mice have more severe IBD symptoms than wild-type mice [33,34,37].