Thymosin is a hormone secreted from the thymus. Its primary function is to stimulate the production of T cells， which are an important part of the immune system. Thymosin also assists in the development of B cells to plasma cells to produce antibodies. The predominant form of thymosin， thymosin b4， is a member of a highly conserved family of actin monomer-sequestering proteins. b-thymosins are the primary regulators of unpolymerized actin， and are essential for maintaining the small cytoplasmic pool of free G-actin monomers required for rapid filament elongation and allowing for the flux of monomers between the thymosin-bound pool and F-actin.
Lyophilized Thymosin b4 although stable at room temperature for 3 weeks， should be stored desiccated below -18℃. Upon reconstitution T beta 4 should be stored at 4℃ between 2-7 days and for future use below -18℃. For long term storage it is recommended to add a carrier protein （0.1% HSA or BSA）. Please prevent freeze-thaw cycles.