Lineage for Fold a.21: HMG-box
- Root: SCOP 1.71
Class a: All alpha proteins [46456] (226 folds) 
Fold a.21: HMG-box [47094] (1 superfamily)
3 helices; irregular array
Superfamily:
a.21.1: HMG-box [47095] (1 family) 
More info for Fold a.21: HMG-box
Timeline for Fold a.21: HMG-box:
- Fold a.21: HMG-box first appeared (with stable ids) in SCOP 1.55
- Fold a.21: HMG-box appears in SCOP 1.69
- Fold a.21: HMG-box appears in SCOP 1.73
- Fold a.21: HMG-box appears in the current release, SCOPe 2.08