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Description
Subsequent work established that the peptide was naturally complexed with copper in plasma and that both the peptide and the copper were necessary for its biological effects
Tetrahydrobiopterin in nitric oxide synthase
The peptides proline-rich pentadecapeptide structure lacks conventional enzyme cleavage sites, allowing it to survive the low-pH gastric environment that destroys most peptide structures
Selected Research References United States Pharmacopeia
