6D7U:
reference: Structural and Molecular Characterization of the Hemagglutinin from the Fifth Epidemic Wave A(H7N9) Influenza Viruses., Yang H, Carney PJ, Chang JC, Guo Z, Stevens J, J Virol. 2018 May 30. pii: JVI.00375-18. doi: 10.1128/JVI.00375-18. PMID: 29848588

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