6F5O:
reference: A Mechanism for the Activation of the Influenza Virus Transcriptase., Serna Martin I, Hengrung N, Renner M, Sharps J, Martinez-Alonso M, Masiulis S, Grimes JM, Fodor E, Mol Cell. 2018 Jun 21;70(6):1101-1110.e4. doi: 10.1016/j.molcel.2018.05.011. Epub, 2018 Jun 14. PMID: 29910112

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