Predicted to enable signaling receptor binding activity. Involved in extrathymic T cell selection. Located in cell surface. Is expressed in ductus deferens; epididymis; ileum; prostate gland; and testis. Orthologous to human BTNL3 (butyrophilin like 3) and BTNL8 (butyrophilin like 8). [provided by Alliance of Genome Resources, Apr 2022]