Predicted to enable receptor ligand activity. Acts upstream of or within immunoglobulin mediated immune response; positive regulation of adaptive immune response based on somatic recombination of immune receptors built from immunoglobulin superfamily domains; and positive regulation of cell population proliferation. Located in external side of plasma membrane. Is expressed in central nervous system; renal vasculature; retina outer nuclear layer; and superior cervical ganglion. Human ortholog(s) of this gene implicated in B-lymphoblastic leukemia/lymphoma. Orthologous to human TNFSF13 (TNF superfamily member 13). [provided by Alliance of Genome Resources, Apr 2022]