6IUT:
reference: Structural and functional definition of a vulnerable site on the hemagglutinin of highly pathogenic avian influenza A virus H5N1., Wang P, Zuo Y, Sun J, Zuo T, Zhang S, Guo S, Shi X, Liang M, Zhou P, Zhang L, Wang X, J Biol Chem. 2019 Feb 8. pii: RA118.007008. doi: 10.1074/jbc.RA118.007008. PMID: 30737282

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