Growth factor active in angiogenesis, vasculogenesis and endothelial cell growth. Induces endothelial cell proliferation, promotes cell migration, inhibits apoptosis and induces permeabilization of blood vessels. Binds to heparan sulfate and heparin. Homodimer; disulfide-linked. Also found as heterodimer with PGF. Expressed by the venom gland. Belongs to the PDGF/VEGF growth factor family.