3JW2:
reference: Highly conserved glycine 86 and arginine 87 residues contribute differently to the structure and activity of the mature HIV-1 protease., Ishima R, Gong Q, Tie Y, Weber IT, Louis JM, Proteins. 2009 Sep 28. PMID: 19899162

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