| 3KT5: reference: Resistance mechanism revealed by crystal structures of unliganded nelfinavir-resistant HIV-1 protease non-active site mutants N88D and N88S., Bihani SC, Das A, Prashar V, Ferrer JL, Hosur MV, Biochem Biophys Res Commun. 2009 Nov 13;389(2):295-300. Epub 2009 Aug 29. PMID: 19720046 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).