6FS9:
reference: Characterization of influenza virus variants induced by treatment with the endonuclease inhibitor baloxavir marboxil., Omoto S, Speranzini V, Hashimoto T, Noshi T, Yamaguchi H, Kawai M, Kawaguchi K, Uehara T, Shishido T, Naito A, Cusack S, Sci Rep. 2018 Jun 25;8(1):9633. doi: 10.1038/s41598-018-27890-4. PMID: 29941893

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