4I78:
reference: Hemagglutinin homologue from H17N10 bat influenza virus exhibits divergent receptor-binding and pH-dependent fusion activities., Zhu X, Yu W, McBride R, Li Y, Chen LM, Donis RO, Tong S, Paulson JC, Wilson IA, Proc Natl Acad Sci U S A. 2013 Jan 7. PMID: 23297216

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