<qa>  What is the growth factor that is PDGF?It has been previously demonstrated that platelets contain growth factors, in particular PDGF platelet derivated growth factors, TGF-α1 and 2 transforming growth factors and IGF-1 insulin like growth factor. These molecules have receptors on spongy bone, enhance mitosis, osteoblast differentiation, angiogenesis and induce the inhibition of osteoclats. 