2FK0:
reference: Structure and receptor specificity of the hemagglutinin from an H5N1 influenza virus., Stevens J, Blixt O, Tumpey TM, Taubenberger JK, Paulson JC, Wilson IA, Science. 2006 Apr 21;312(5772):404-10. Epub 2006 Mar 16. PMID: 16543414

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