Induces capillary permeability through VEGF receptor (KDR/VEGFR-2) signaling. May also induce angiogenesis. Homodimer; disulfide-linked (By similarity). Interacts with high affinity with KDR/VEGFR-2, and with a lower affinity with neuropilin-1 (NRP1) and neuropilin-2 (NRP2). Expressed by the venom gland. Belongs to the PDGF/VEGF growth factor family. Snake venom VEGF subfamily.