1Q9P:
reference: Solution structure of the mature HIV-1 protease monomer: insight into the tertiary fold and stability of a precursor., Ishima R, Torchia DA, Lynch SM, Gronenborn AM, Louis JM, J Biol Chem 2003 Oct 31;278(44):43311-9. Epub 2003 Aug 21. PMID: 12933791

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).