1K6T:
reference: Lack of synergy for inhibitors targeting a multi-drug-resistant HIV-1 protease., King NM, Melnick L, Prabu-Jeyabalan M, Nalivaika EA, Yang SS, Gao Y, Nie X, Zepp C, Heefner DL, Schiffer CA, Protein Sci 2002 Feb;11(2):418-29. PMID: 11790852

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