Number of Protein Chains:3
- Classes: All alpha proteins
 - Folds: Retroviral matrix proteins
 - Superfamilies: Retroviral matrix proteins
 - Families: Immunodeficiency virus matrix proteins
 
Protein Domains:
- HIV-1 matrix protein (HIV-1 MA, HIVp17, p17, MA)
 - SIV matrix antigen
 
	* [ ] : Polypeptide  - [AB] : Protein, [ab] : Small peptide
* ( ) : Nucleic acid - (AB) : DNA, (ab) : RNA
	
* ( ) : Nucleic acid - (AB) : DNA, (ab) : RNA
