| Enzyme | example | rubisco |
| PDB ID | 1BUR | |
| number of residues | 2392 | |
| Storage | example | sperm whale myoglobin |
| PDB ID | 1HJT | |
| number of residues | 153 | |
| Transport | example | cytochrome c |
| PDB ID | 1YEA | |
| number of residues | 112 | |
| Messenger | example | glucagon |
| PDB ID | 1GCN | |
| number of residues | 29 | |
| Antibody | example | FV fragement of mouse monoclonal antibody D1.3 |
| PDB ID | 1A7N | |
| number of residues | 223 | |
| Regulator | example | lactose operon repressor |
| PDB ID | 1LBH | |
| number of residues | 1440 | |
| structure protein | example | solution structure of the spectrin repeat |
| PDB ID | 1AJ3 | |
| number of residues | 110 |