Extended Data Figure 9: Quasi-species in putative lysine fence.
From: The soft palate is an important site of adaptation for transmissible influenza viruses

Deep sequencing analysis of the α2,3 H1N1pdm inoculum revealed a mixed population at four lysine residues surrounding the receptor binding site of the HA protein. The lysine fence was restored in viruses from the nasal wash of airborne-contact animals from 6 days post-exposure (DPE). Each bar represents a single animal, and each amino acid (aa) that contained a quasi-species is indicated.