6E8W:
reference: Structure of the membrane proximal external region of HIV-1 envelope glycoprotein., Fu Q, Shaik MM, Cai Y, Ghantous F, Piai A, Peng H, Rits-Volloch S, Liu Z, Harrison SC, Seaman MS, Chen B, Chou JJ, Proc Natl Acad Sci U S A. 2018 Sep 5. pii: 1807259115. doi:, 10.1073/pnas.1807259115. PMID: 30185554

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