Lineage for Fold a.22: Histone-fold
- Root: SCOP 1.63
Class a: All alpha proteins [46456] (171 folds) 
Fold a.22: Histone-fold [47112] (1 superfamily)
core: 3 helices; long middle helix is flanked at each end with shorter ones
Superfamily:
a.22.1: Histone-fold [47113] (3 families) 
More info for Fold a.22: Histone-fold
Timeline for Fold a.22: Histone-fold:
- Fold a.22: Histone-fold first appeared (with stable ids) in SCOP 1.55
- Fold a.22: Histone-fold appears in SCOP 1.61
- Fold a.22: Histone-fold appears in SCOP 1.65
- Fold a.22: Histone-fold appears in the current release, SCOPe 2.08