Fold: EF Hand-like

core: 4 helices; array of 2 hairpins, opened

Lineage:

1. Root: scop
2. Class: All alpha proteins
3. Fold: EF Hand-like
   core: 4 helices; array of 2 hairpins, opened

Superfamilies:

1. EF-hand (7)
   Duplication: consists of two EF-hand units: each is made of two helices connected with calcium-binding loop
2. Insect pheromon/odorant-binding proteins (1)
   the N-terminal extention, containing a few short helices, forms a flexible lid for the binding cavity
3. Cloroperoxidase (1)
   duplication: consists of 2 similar domains composed of 2 EF hand-like motifs each