| 1F7A: reference: How does a symmetric dimer recognize an asymmetric substrate? A substrate complex of HIV-1 protease., Prabu-Jeyabalan M, Nalivaika E, Schiffer CA, J Mol Biol 2000 Sep 1;301(5):1207-20. PMID: 10966816 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).