6Y5H:
reference: Structural transitions in influenza haemagglutinin at membrane fusion pH., Benton DJ, Gamblin SJ, Rosenthal PB, Skehel JJ, Nature. 2020 May 27. pii: 10.1038/s41586-020-2333-6. doi:, 10.1038/s41586-020-2333-6. PMID: 32461688

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