Is predicted to encode a protein with the following domains: Immunoglobulin I-set domain; Immunoglobulin I-set; Immunoglobulin subtype; Immunoglobulin-like domain; Immunoglobulin-like fold; CD80-like C2-set immunoglobulin domain; Immunoglobulin domain; CD80-like, immunoglobulin C2-set; Immunoglobulin subtype 2; and Immunoglobulin-like domain superfamily. Is an ortholog of C. elegans syg-1. In C. elegans, syg-1 is involved in actin filament bundle assembly; cell-cell signaling; and nervous system development.