The pentapeptide Thymopentin (TP-5) is the fragment of thymopoietinⅡ(32-36) with basic sequence H-Arg-Lys-Asp-Val-Tyr-OH. It has the same biological activity as the thymopoietin II, which has the double-direction immunities to our bodies. Thymopentin can promote or suppress immune functions, which tend to normal. A multitude of studies have shown the efficacy of TP-5 treatment for the therapy of a variety of diseases, including primary and secondary immune deficiencies, autoimmunity, infections, cancer, hep...