Table 3. Summary of metal binding sites that have at least one protein ligand in different structures of HSA and ESA in complex with Zn²⁺. ‘x’ indicates that site is present in the structure. ‘*’ indicates that anomalous signal is present in the site, but at least one of the coordinating residues observed in other structures is not present in Zn²⁺ vicinity due to disorder or different conformation of the sidechain. ‘#’ indicates that Zn²⁺ could not be modeled in the location, see text for details. Residue numbers refer to HSA; in case of non-conserved residues, the HSA amino acid is given in parentheses.