Thymosin beta 4 is a 43 amino acid peptide that is regarded as the foremost intracellular G-actin sequestering peptide. Beta 4 mRNA was found in all the stages of thymocyte and hepatocyte cell cycle, which showed an increase in the S-phase, which was maintained during the G2 and M phases. Extracellular thymosin beta 4 contributes to physiological processes such as angiogenesis, wound healing, and regulation of inflammation.