PDGFA is a member of the platelet-derived growth factor family. Four members of this family are mitogenic factors for cells of mesenchymal origin, and they are characterized by a motif of eight cysteines. PDGFA plays an essential role in the regulation of embryonic development, cell proliferation, cell migration, and chemotaxis. It is also required for normal lung alveolar septum formation during embryogenesis, development of the gastrointestinal tract, and spermatogenesis. PDGFA is also involved in oligodendrocyte development and the myelination process in the spinal cord and cerebellum. PDGF-A protein monomer is about 13-16 kDa, and PDGF-AA is a 28.5 kDa A chain homodimer.