Lineage for Superfamily a.24.26: YppE-like

1. Root: SCOPe 2.02

2. Class a: All alpha proteins [46456] (284 folds)

3. Fold a.24: Four-helical up-and-down bundle [47161] (28 superfamilies) core: 4 helices; bundle, closed or partly opened, left-handed twist; up-and-down

4. Superfamily a.24.26: YppE-like [140415] (1 family) flattened bundle at one end with helices 2 and coming in contact and separating helices 1 and 3