5JS9:
reference: Uncleaved prefusion-optimized gp140 trimers derived from analysis of HIV-1 envelope metastability., Kong L, He L, de Val N, Vora N, Morris CD, Azadnia P, Sok D, Zhou B, Burton DR, Ward AB, Wilson IA, Zhu J, Nat Commun. 2016 Jun 28;7:12040. doi: 10.1038/ncomms12040. PMID: 27349805

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