Enables identical protein binding activity and tumor necrosis factor receptor superfamily binding activity. Involved in several processes, including positive regulation of NF-kappaB transcription factor activity; regulation of T cell activation; and regulation of leukocyte chemotaxis. Located in cell surface. Is expressed in skin; submandibular gland; and thyroid gland. Orthologous to human TNFSF18 (TNF superfamily member 18). [provided by Alliance of Genome Resources, Apr 2022]