1A8G:
reference: X-ray structure and conformational dynamics of the HIV-1 protease in complex with the inhibitor SDZ283-910: agreement of time-resolved spectroscopy and molecular dynamics simulations., Ringhofer S, Kallen J, Dutzler R, Billich A, Visser AJ, Scholz D, Steinhauser O, Schreiber H, Auer M, Kungl AJ, J Mol Biol 1999 Mar 5;286(4):1147-59. PMID: 10047488

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