1U6V:
reference: Induced fit in HIV-neutralizing antibody complexes: evidence for alternative conformations of the gp120 V3 loop and the molecular basis for broad neutralization., Rosen O, Chill J, Sharon M, Kessler N, Mester B, Zolla-Pazner S, Anglister J, Biochemistry 2005 May 17;44(19):7250-8. PMID: 15882063

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