Is predicted to encode a protein with the following domains: Immunoglobulin I-set domain; Immunoglobulin I-set; Immunoglobulin-like fold; Immunoglobulin subtype 2; Immunoglobulin domain; Immunoglobulin-like domain superfamily; and Immunoglobulin subtype. Is an ortholog of C. elegans zig-4. In C. elegans, zig-4 is involved in neuron development.