1TI8:
reference: H1 and H7 influenza haemagglutinin structures extend a structural classification of haemagglutinin subtypes., Russell RJ, Gamblin SJ, Haire LF, Stevens DJ, Xiao B, Ha Y, Skehel JJ, Virology 2004 Aug 1;325(2):287-96. PMID: 15246268

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