Enables G protein-coupled receptor binding activity. Predicted to be involved in several processes, including angiogenesis; endothelial cell proliferation; and positive regulation of smooth muscle contraction. Predicted to act upstream of or within circadian rhythm. Predicted to be located in extracellular region. Human ortholog(s) of this gene implicated in hypogonadotropic hypogonadism 4 with or without anosmia. Orthologous to human PROK2 (prokineticin 2). [provided by Alliance of Genome Resources, Apr 2022]