Figure 3From: A new look at an old virus: patterns of mutation accumulation in the human H1N1 influenza virus since 1918Mutation accumulation in human H1N1, using the 1918 Brevig Mission strain as a reference. Sequences derived from the 1976-reintroduction (red symbols) were moved back in time by 21 years to adjust for an apparent period of dormancy, resulting in highly-linear mutation accumulation curves. Filled symbols = nucleotide changes. Hollow symbols = non-synonymous amino acid changes.Back to article page