3S11:
reference: Acid stability of the hemagglutinin protein regulates H5N1 influenza virus pathogenicity., DuBois RM, Zaraket H, Reddivari M, Heath RJ, White SW, Russell CJ, PLoS Pathog. 2011 Dec;7(12):e1002398. Epub 2011 Dec 1. PMID: 22144894

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