TB500 ndi peptide yamitundumitundu yopangidwa mwaluso mu labu. Ili ndi mawonekedwe ndi ntchito yofanana ndi Thymosin Beta 4 yomwe imapangidwa ndi gland ya thymus m'thupi. TB500 ndi  Thymosin Beta 4 onse amapangidwa ndi ma amino acid 43 motsatizana ndipo ali ndi zotsatira zofanana pa machiritso ndi kuchira. Mwachidule, TB500 ndi mtundu wa Thymosin Beta 4. Chifukwa chake, timagwiritsa ntchito mayina onse mosinthana chifukwa zotsatira zake zimakhala zofanana.