1NJ0:
reference: Alternative conformations of HIV-1 V3 loops mimic beta hairpins in chemokines, suggesting a mechanism for coreceptor selectivity., Sharon M, Kessler N, Levy R, Zolla-Pazner S, Gorlach M, Anglister J, Structure (Camb) 2003 Feb;11(2):225-36. PMID: 12575942

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