4L8B:
reference: Acute emergence and reversion of influenza A virus quasispecies within CD8(+) T cell antigenic peptides., Valkenburg SA, Quinones-Parra S, Gras S, Komadina N, McVernon J, Wang Z, Halim H, Iannello P, Cole C, Laurie K, Kelso A, Rossjohn J, Doherty PC, Turner SJ, Kedzierska K, Nat Commun. 2013 Oct 30;4:2663. doi: 10.1038/ncomms3663. PMID: 24173108

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