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For GHK-Cu, this definitively verifies the peptide's primary sequence and, crucially, confirms the presence of the copper ion by matching the measured mass to the theoretical mass of the complex (~403.9 Da)
Interrelationships between the binding sites for amino acids, dipeptides, and gamma-glutamyl donors in gamma-glutamyl transpeptidase
Together, these results suggest that the complement system, particularly C4A, may play a key role in the gene-environment interactions of schizophrenia by modulating the gut microbiota and systemic immune activation status
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