TGFB1 and Stroke: During this phase of post-stroke recovery, pericytes are responsible for secreting vasogenic factors that support vascular sprouting, such as platelet-derived growth factor receptor-beta (PDGFRβ), transforming growth factor-beta (TGF-β), vascular endothelial growth factor (VEGF), and angiopoietin 1,2 [58,59].