| Id | Element | Ion | Binding family | Amino acids or nucleotide residues names | All bound residues | Is homomer | Number of bound amino acids or nucleotide residues | Number of all bound residues | Number of coordinating chains | Representative |
|---|---|---|---|---|---|---|---|---|---|---|
| 2FGQ-CA-4 | CA | Ca²⁺ | F3 | PHE. | PHE. | ✔ | 3 | 3 | 3 | ✔ |
| 2FGR-CA-4 | CA | Ca²⁺ | F3 | PHE. | HOH.PHE. | ✔ | 3 | 4 | 3 | ✔ |