Is predicted to encode a protein with the following domains: Immunoglobulin; Immunoglobulin domain; Immunoglobulin I-set; Immunoglobulin subtype 2; Immunoglobulin subtype; Immunoglobulin-like fold; Immunoglobulin-like domain superfamily; and Immunoglobulin I-set domain. Is an ortholog of C. elegans zig-3.