Classes in SCOP 1.73:

1. a: All alpha proteins [46456] (258 folds)

2. b: All beta proteins [48724] (165 folds)

3. c: Alpha and beta proteins (a/b) [51349] (141 folds)

4. d: Alpha and beta proteins (a+b) [53931] (334 folds)

5. e: Multi-domain proteins (alpha and beta) [56572] (53 folds)

6. f: Membrane and cell surface proteins and peptides [56835] (50 folds)

7. g: Small proteins [56992] (85 folds)

8. h: Coiled coil proteins [57942] (7 folds)

9. i: Low resolution protein structures [58117] (26 folds)

10. j: Peptides [58231] (120 folds)

11. k: Designed proteins [58788] (44 folds)