3B80:
reference: Caught in the Act: The 1.5 A Resolution Crystal Structures of the HIV-1 Protease and the I54V Mutant Reveal a Tetrahedral Reaction Intermediate., Kovalevsky AY, Chumanevich AA, Liu F, Louis JM, Weber IT, Biochemistry. 2007 Dec 25;46(51):14854-14864. Epub 2007 Dec 4. PMID: 18052235

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