- PDGF C is a selective alpha platelet-derived growth factor receptor agonist that is highly expressed in platelet alpha granules and vascular smooth muscle. Fang, L., Yan, Y., Komuves, L.G., Yonkovich, S., Sullivan, C.M., Stringer, B., Galbraith, S., Lokker, N.A., Hwang, S.S., Nurden, P., Phillips, D.R., Giese, N.A. Arterioscler. Thromb. Vasc. Biol. (2004)