6UJU:
reference: Structural basis of transmembrane coupling of the HIV-1 envelope glycoprotein., Piai A, Fu Q, Cai Y, Ghantous F, Xiao T, Shaik MM, Peng H, Rits-Volloch S, Chen W, Seaman MS, Chen B, Chou JJ, Nat Commun. 2020 May 8;11(1):2317. doi: 10.1038/s41467-020-16165-0. PMID: 32385256

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