FCO
PCM
| Residue type | PCM type | Category | Position | UniProt PTM accession | Entries in PDB |
| CSO | None | Metal coordination | Amino-acid side chain (Any position) | 18 | |
| CSO | None | Metal coordination | Amino-acid side chain (Any position) | 3 | |
| CSS | None | Metal coordination | Amino-acid side chain (Any position) | 6 | |
| CSX | None | Metal coordination | Amino-acid side chain (Any position) | 13 | |
| CYS | None | Metal coordination | Amino-acid side chain (Any position) | 423 |
