- Classes: All alpha proteins
 - Folds: Poly A polymerase C-terminal region-like
 - Superfamilies: Poly A polymerase C-terminal region-like
 - Families: Poly A polymerase C-terminal region-like
 
Protein Domains:
- Poly A polymerase PcnB
- [A](a)
 
 - tRNA CCA-adding enzyme, C-terminal domains
- [A2]
 - [A2]
 
 
	* [ ] : Polypeptide  - [AB] : Protein, [ab] : Small peptide
* ( ) : Nucleic acid - (AB) : DNA, (ab) : RNA
* ( ) : Nucleic acid - (AB) : DNA, (ab) : RNA
