[A2B2](ABCD)
Classes:
- All alpha proteins0
- All beta proteins0
- Alpha and beta proteins (a+b)0
- Alpha and beta proteins (a/b)0
- Artifacts0
- Coiled coil proteins0
- Designed proteins0
- Low resolution protein structures0
- Membrane and cell surface proteins and peptides0
- 4
- 13
- Peptides0
- Small proteins0
* Number of PDB entries of each Class