Fold: Transmembrane beta-barrels

not a true fold, gathers together transmembrane barrels of different (n,S)

Lineage:

1. Root: scop
2. Class: Membrane and cell surface proteins and peptides
   Does not include proteins in the immune system
3. Fold: Transmembrane beta-barrels
   not a true fold, gathers together transmembrane barrels of different (n,S)

Superfamilies:

1. Outer membrane protein (1)
   forms (8,10) barrel
2. Outer membrane phospholipase A (OMPLA) (1)
   forms (12,16) barrel
3. Porins (3)