- Classes: All alpha proteins
 - Folds: 4-helical cytokines
 - Superfamilies: 4-helical cytokines
 - Families: Long-chain cytokines
 
Protein Domains:
- Growth hormone, somatotropin
- [AB]
 
 - Prolactin (placental lactogen)
- [A], [AB]
 
 - automated matches
- [AB]
 
 
	* [ ] : Polypeptide  - [AB] : Protein, [ab] : Small peptide
* ( ) : Nucleic acid - (AB) : DNA, (ab) : RNA
* ( ) : Nucleic acid - (AB) : DNA, (ab) : RNA
