4QJ9:
reference: Structural basis and distal effects of Gag substrate coevolution in drug resistance to HIV-1 protease., Ozen A, Lin KH, Kurt Yilmaz N, Schiffer CA, Proc Natl Acad Sci U S A. 2014 Nov 11;111(45):15993-8. doi:, 10.1073/pnas.1414063111. Epub 2014 Oct 29. PMID: 25355911

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