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