2AVS:
reference: Kinetic, stability, and structural changes in high-resolution crystal structures of HIV-1 protease with drug-resistant mutations L24I, I50V, and G73S., Liu F, Boross PI, Wang YF, Tozser J, Louis JM, Harrison RW, Weber IT, J Mol Biol. 2005 Dec 9;354(4):789-800. Epub 2005 Oct 21. PMID: 16277992

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