RegeneRx is working on the development of synthetic Thymosin Beta 4 (TB4) therapies to enhance and direct healing: "it consists of 43-amino acid residues and is found in high concentration in blood platelets, wound fluid, white blood cells, and in most other tissues of the body. TB4 is neither a growth factor nor a cytokine. Rather, TB4 is the major actin-regulating molecule in most mammalian cells and plays an important role in the regeneration, remodeling, and healing of injured or damaged tissues. ... TB4 is multi-faceted and involved in a wide variety of biological activities including: regulation of actin, [regrowth of skin], angiogenesis, apoptosis, and anti-inflammation. ... The fact that TB4 influences so many important biological processes may be one reason why the molecule is so highly conserved and remains essentially unchanged throughout evolution."