|  | Class a: All alpha proteins [46456] (179 folds) | 
|  | Fold a.4: DNA/RNA-binding 3-helical bundle [46688] (12 superfamilies) core: 3-helices; bundle, closed or partly opened, right-handed twist; up-and down | 
|  | Superfamily a.4.5: "Winged helix" DNA-binding domain [46785] (36 families)  contains a small beta-sheet (wing) | 
|  | Family a.4.5.21: ets domain [46859] (6 proteins) | 
|  | Protein Elk-1 [46871] (1 species) | 
|  | Species Human (Homo sapiens) [TaxId:9606] [46872] (1 PDB entry) | 
|  | Domain d1duxc_: 1dux C: [16170] | 
|  | Domain d1duxf_: 1dux F: [16171] | 
Timeline for Species Human (Homo sapiens) [TaxId:9606] from a.4.5.21 Elk-1: