Enables cytokine activity and hormone activity. Acts upstream of or within negative regulation of angiogenesis and negative regulation of blood vessel endothelial cell migration. Located in extracellular space. Is expressed in ectoplacental cone; extraembryonic component; placenta; and trophoblast giant cell. Human ortholog(s) of this gene implicated in carotid artery disease. Orthologous to human PRL (prolactin). [provided by Alliance of Genome Resources, Apr 2022]