| 6ULC: reference: Cryo-EM Structure of Full-length HIV-1 Env Bound With the Fab of Antibody PG16., Pan J, Peng H, Chen B, Harrison SC, J Mol Biol. 2020 Feb 14;432(4):1158-1168. doi: 10.1016/j.jmb.2019.11.028. Epub, 2020 Jan 11. PMID: 31931014 |
This OCA 
Structure page
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(documentation).