TB-500 is a synthetic N-acetylated peptide corresponding to the actin-binding active site (residues 17-23, sequence Ac-LKKTETQ) of the naturally occurring 43-amino acid polypeptide thymosin beta-4 (Tβ4). As a highly conserved and ubiquitously expressed protein, thymosin beta-4 plays a fundamental role in cellular differentiation, cytoskeletal organization, and tissue remodeling. TB-500 retains the core functional motif responsible for G-actin sequestration and actin filament dynamics regulation, making it a precise research tool for investigating cell migration, angiogenesis, wound healing mechanisms, and inflammatory modulation in controlled experimental systems [citation:1][citation:4][citation:6].