4J2R:
reference: Crystallization and preliminary X-ray diffraction studies of a surface mutant of the middle domain of PB2 from human influenza A (H1N1) virus., Tsurumura T, Qiu H, Yoshida T, Tsumori Y, Tsuge H, Acta Crystallogr F Struct Biol Commun. 2014 Jan;70(Pt 1):72-5. doi:, 10.1107/S2053230X13032603. Epub 2013 Dec 24. PMID: 24419622

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