6P9B:
reference: Highly drug-resistant HIV-1 protease reveals decreased intra-subunit interactions due to clusters of mutations., Kneller DW, Agniswamy J, Harrison RW, Weber IT, FEBS J. 2020 Jan 9. doi: 10.1111/febs.15207. PMID: 31920003

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