Root: scop

Classes:

1. All alpha proteins [46456] (4)
2. All beta proteins [48724] (8)
3. Alpha and beta proteins (a/b) [51349] (6)
   Mainly parallel beta sheets (beta-alpha-beta units)
4. Alpha and beta proteins (a+b) [53931] (5)
   Mainly antiparallel beta sheets (segregated alpha and beta regions)
5. Membrane and cell surface proteins and peptides [56835] (1)
   Does not include proteins in the immune system
6. Small proteins [56992] (4)
   Usually dominated by metal ligand, heme, and/or disulfide bridges