Enables growth factor activity and hormone activity. Acts upstream of or within several processes, including positive regulation of blood vessel endothelial cell migration; positive regulation of neuroblast proliferation; and regulation of cell projection organization. Located in endoplasmic reticulum and extracellular space. Is expressed in extraembryonic component and placenta. Human ortholog(s) of this gene implicated in carotid artery disease. Orthologous to human PRL (prolactin). [provided by Alliance of Genome Resources, Apr 2022]