4ES5:
reference: Structural and functional characterization of K339T substitution identified in the PB2 subunit cap-binding pocket of influenza A virus., Liu Y, Qin K, Meng G, Zhang J, Zhou J, Zhao G, Luo M, Zheng X, J Biol Chem. 2013 Apr 19;288(16):11013-23. doi: 10.1074/jbc.M112.392878. Epub, 2013 Feb 22. PMID: 23436652

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