Amino acid differences across all NS1 sequences were integrated in a
percentage identity matrix, and relative distances were plotted using x and y
coordinates. Averages of triplicates expressed as the log2 fold
induction over the initial relative proportion of barcode reads found in the
initial viral mix (input) were plotted on the z axis. (A–F) Individual
plots in mice (A and B), MDCK cells (C and D), and allantoic fluid (E and F)
were generated. Viruses containing allele A (A, C, E) or allele B (B, D, F) NS1
were plotted separately in each case for visualization purposes.