5EG9:
reference: The cap-binding site of influenza virus protein PB2 as a drug target., Severin C, Rocha de Moura T, Liu Y, Li K, Zheng X, Luo M, Acta Crystallogr D Struct Biol. 2016 Feb;72(Pt 2):245-53. doi:, 10.1107/S2059798316000085. Epub 2016 Jan 22. PMID: 26894672

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