5EFA:
reference: Molecular basis of mRNA cap recognition by Influenza B polymerase PB2 subunit., Xie L, Wartchow C, Shia S, Uehara K, Steffek M, Warne R, Sutton J, Muiru GT, Leonard VH, Bussiere DE, Ma X, J Biol Chem. 2015 Nov 11. pii: jbc.M115.693051. PMID: 26559973

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