Transforming growth factor beta (TGF-β) is a multifunctional cytokine belonging to the transforming growth factor superfamily. TGFB proteins are made by all white blood cell lineages.It is a multipotent growth factor affecting cell differentiation, tissue repair, cell proliferation, matrix production and apoptosis. [1] Reference 1. Clark DA, Coker R. Transforming growth factor-beta (TGF-beta).Int J Biochem Cell Biol. 1998;30(3):293-298. doi:10.1016/s1357-2725(97)00128-3