Fig. 7From: Rules of co-occurring mutations characterize the antigenic evolution of human influenza A/H3N2, A/H1N1 and B virusesMapping co-mutation sites on HA1 protein of H1N1 (PDB ID: 4EDB [40]). The red, blue, yellow, magenta and green colors represent the five epitope regions, the tan color denotes non-epitope region, and the co-mutation sites are circled and marked with corresponding numbers (similarly for the following two figures, i.e. Figs. 8 and 9)Back to article page