4N5Y:
reference: Hemagglutinin receptor specificity and structural analyses of respiratory droplet transmissible H5N1 viruses., de Vries RP, Zhu X, McBride R, Rigter A, Hanson A, Zhong G, Hatta M, Xu R, Yu W, Kawaoka Y, de Haan CA, Wilson IA, Paulson JC, J Virol. 2013 Oct 30. PMID: 24173215

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