Enables signaling receptor binding activity. Involved in positive regulation of cell migration involved in sprouting angiogenesis and vocalization behavior. Located in collagen-containing extracellular matrix and extracellular space. Is expressed in several structures, including alimentary system; limb; musculoskeletal system; peritoneum; and testis. Orthologous to human SRPX2 (sushi repeat containing protein X-linked 2). [provided by Alliance of Genome Resources, Apr 2022]