Is predicted to encode a protein with the following domains: Lustrin, cysteine-rich repeated domain; Fibronectin type III superfamily; Immunoglobulin I-set domain; Domain of unknown function DB; Immunoglobulin I-set; Fibronectin type III; Immunoglobulin-like fold; Immunoglobulin-like domain superfamily; Lustrin, cysteine-rich repeated; Fibronectin type III domain; and DB module. Is an ortholog of C. elegans igdb-1 and igdb-2.