Thymosin β4 is a ubiquitous, 43-amino acid acidic polypeptide with a molecular weight of 4.9 kDa.It is highly conserved across species, and is found in all tissues and cell types except red blood cells. Thymosin β4 is a multifunctional protein that promotes cell migration, stem cell recruitment and differentiation, protease production, and the expression of various regulatory genes, such as …