This gene encodes a member of the Ly6/PLAUR family of cysteine-rich proteins that plays an important role in the protection of colonic epithelium from flagellated microbiota. The encoded protein undergoes proteolytic processing to generate a mature, glycosylphosphatidylinositol-anchored protein that is localized to the apical surface of the colonic epithelial cells. Mice lacking the encoded protein are sensitive to chemically induced intestinal inflammation. [provided by RefSeq, Aug 2016]