Fold: Snake toxin-like

disulphide-rich fold: nearly all-beta

Lineage:

1. Root: scop
2. Class: Small proteins
   Usually dominated by metal ligand, heme, and/or disulfide bridges
3. Fold: Snake toxin-like
   disulphide-rich fold: nearly all-beta

Superfamilies:

1. Snake toxin-like (3)
   1. Snake venom toxins (26)
   2. Dendroaspin (1)
   3. Extracellular domain of cell surface receptors (3)