Fold: Lipocalins

barrel, closed or opened; n=8, S=12; meander

Lineage:

1. Root: scop
2. Class: All beta proteins
3. Fold: Lipocalins
   barrel, closed or opened; n=8, S=12; meander

Superfamilies:

1. Lipocalins (3)
   bind hydrophobic ligands in their interior
   1. Retinol binding protein-like (19)
      barrel, closed; n=8, S=12, meander
   2. Fatty acid binding protein-like (14)
      ten-stranded meander beta-sheet folded upon itself
      relates to the common fold by opening the barrel and insertion of beta-hairpin
   3. Thrombin inhibitor (1)