4LXV:
reference: Structural stability of influenza A(H1N1)pdm09 virus hemagglutinins., Yang H, Chang JC, Guo Z, Carney PJ, Shore DA, Donis RO, Cox NJ, Villanueva JM, Klimov AI, Stevens J, J Virol. 2014 Feb 12. PMID: 24522930

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