HY1
PCM
| Residue type | PCM type | Category | Position | UniProt PTM accession | Entries in PDB |
| null | None | Non-standard residue | Amino-acid side chain and backbone (N-terminal) | 9 | |
| TQQ | None | Covalent chemical modification | Amino-acid side chain (Any position) | 2 | |
| TTQ | None | Covalent chemical modification | Amino-acid side chain (Any position) | 2 | |
| SER | None | Covalent chemical modification | Amino-acid side chain (Any position) | 1 |
