Thymosin Alpha-1 (TA-1) is a synthetic 28-amino acid peptide identical to a naturally occurring fragment of...
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PT-141 (Bremelanotide) is a synthetic cyclic heptapeptide derived from Melanotan II that acts as an agonist at the melanocortin MC3 and MC4 receptors, retaining the His-Phe-Arg-Trp core sequence of alpha-MSH. Its cyclic lactam structure gives it improved resistance to enzymatic degradation. It is used as a reference compound in melanocortin receptor and neuroscience research.
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