1K2B:
reference: Combining mutations in HIV-1 protease to understand mechanisms of resistance., Mahalingam B, Boross P, Wang YF, Louis JM, Fischer CC, Tozser J, Harrison RW, Weber IT, Proteins 2002 Jul 1;48(1):107-16. PMID: 12012342

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