Thymulin is a nonapeptide — a chain of nine amino acids — produced by epithelial cells in the thymus gland. It was first isolated and characterized in 1977 and has the sequence Pyr-Ala-Lys-Ser-Gln-Gly-Gly-Ser-Asn, with a molecular weight of approximately 858 g/mol (without zinc). Its molecular formula is C₃₃H₅₄N₁₂O₁₅. Thymulin is chemically unique among thymic peptides because it requires a zinc ion (Zn²⁺) to fold into its characteristic three-dimensional fold. Without zinc, the peptide remains in an unfolded state. It is supplied as a white lyophilized powder that is soluble in water and should be stored refrigerated at 2–8 °C.
This product is strictly for research purposes only. Not approved for human or animal use.
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