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In contrast, when bound to transcobalamin II, the half-life is significantly shorter, approximately 1.5 hours, although the final plasma curves for both forms yield similar half-life values of around 9.3 to 9.8 days due to the rapid reappearance of the radiocobalt label bound to transcobalamin I

The imidazole nitrogen of the histidine side chain donates one of the three nitrogen ligands to the copper, and the position of histidine at the second residue is what enables the deprotonated amide nitrogen of the preceding Gly-His peptide bond to also coordinate the copper

Published findings concerning body composition, glucose regulation, liver pathology and muscle function come from laboratory and animal studies rather than established human clinical trials

Zhuang, X.-H., Mo, Y., Jiang, X.-Y