2QHC:
reference: Enzymatic and structural analysis of the I47A mutation contributing to the reduced susceptibility to HIV protease inhibitor lopinavir., Saskova KG, Kozisek M, Lepsik M, Brynda J, Rezacova P, Vaclavikova J, Kagan RM, Machala L, Konvalinka J, Protein Sci. 2008 Sep;17(9):1555-64. Epub 2008 Jun 17. PMID: 18560011

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