doi:10.1677/jme.0.0250321
The peptide backbone provides three coordination sites for copper: the free alpha-amino group of glycine, the deprotonated amide nitrogen of the glycyl-histidyl bond, and the imidazole nitrogen of the histidine side chain, with the lysine epsilon-amine remaining available for further interactions
17(6): p

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Activated G Protein Gs Samples Multiple Endomembrane Compartments
Ann Oncol 1997;8(6):569-573