Family: Extracellular domain of cell surface receptors

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
4. Superfamily: Snake toxin-like
5. Family: Extracellular domain of cell surface receptors

Protein Domains:

1. CD59
   1. Human (Homo sapiens) (5)
2. Type II activin receptor
   1. Mouse (Mus musculus) (1)
3. BMP receptor Ia ectodomain
   1. Human (Homo sapiens) (1)