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The trans-3-hexenoyl group on the N-terminal tyrosine acts as a protective cap against dipeptidyl peptidase-IV (DPP-IV), the enzyme that cleaves native GHRH between residues 2 and 3 and generates the short plasma half-life that limits unmodified GHRH activity
Not for human use or diagnostic/therapeutic applications
10.1038/s41598-017-13601-y Sci
Note that the TB-500 name has historically been applied both to the full 43-residue protein and, as documented by Ho and colleagues (J Chromatogr A, 2012), to preparations containing only the LKKTETQ heptapeptide
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