Lineage for Fold b.20: ENV polyprotein, receptor-binding domain
- Root: SCOPe 2.08
Class b: All beta proteins [48724] (180 folds) 
Fold b.20: ENV polyprotein, receptor-binding domain [49829] (1 superfamily)
sandwich; 9 strands in 2 sheets; greek-key; contains a few helices in loop regions
Superfamily:
b.20.1: ENV polyprotein, receptor-binding domain [49830] (1 family) 
automatically mapped to Pfam PF00429
More info for Fold b.20: ENV polyprotein, receptor-binding domain
Timeline for Fold b.20: ENV polyprotein, receptor-binding domain:
- Fold b.20: ENV polyprotein, receptor-binding domain first appeared (with stable ids) in SCOP 1.55, called Fold b.20: F-MuLV receptor-binding domain
- Fold b.20: ENV polyprotein, receptor-binding domain appears in SCOPe 2.07