| 6CM3: reference: Partially Open HIV-1 Envelope Structures Exhibit Conformational Changes Relevant for Coreceptor Binding and Fusion., Wang H, Barnes CO, Yang Z, Nussenzweig MC, Bjorkman PJ, Cell Host Microbe. 2018 Oct 10;24(4):579-592.e4. doi: 10.1016/j.chom.2018.09.003. PMID: 30308160 |
This OCA 
Structure page
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(documentation).