Predicted to enable identical protein binding activity. Involved in several processes, including positive regulation of NF-kappaB transcription factor activity; regulation of cytokine production; and regulation of signal transduction. Predicted to be located in intracellular membrane-bounded organelle and plasma membrane. Predicted to be active in external side of plasma membrane. Is expressed in brain; embryo; and testis. Orthologous to human CD84 (CD84 molecule). [provided by Alliance of Genome Resources, Apr 2022]