Enables identical protein binding activity. Acts upstream of or within cardiac muscle contraction; coronary vasculature development; and protein O-linked glycosylation. Located in extracellular region. Is expressed in several structures, including alimentary system; brain; cardiovascular system; genitourinary system; and musculoskeletal system. Human ortholog(s) of this gene implicated in myocardial infarction and pulmonary hypertension. Orthologous to human VEGFB (vascular endothelial growth factor B). [provided by Alliance of Genome Resources, Apr 2022]