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Genetically predetermined deficiencies of the two B12 transport proteins, congenital transcobalamin deficiency (gene locus 22q11.2-qter) or haptocorrin deficiency (gene locus 11q11-q12), can be associated with total serum B12 values that may be normal, or falsely low, respectively (Amos et al., 1994)

The Bottom Line on GHK-Cu Research in 2026 GHK-Cu remains the most thoroughly characterized regenerative peptide available for research use

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Interestingly, 78c showed no activity against ADP-ribosyl cyclase at concentrations up to 50 nM, while it exhibited no modulatory effects on CD157, suggesting its specificity toward CD38 139