Fig. 9From: 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 H3N2 (PDB ID: 2YPG [41]). All sites are distributed on the five epitope regions, colored as red, blue, green, yellow and magenta for epitope regions A, B, C, D and E respectivelyBack to article page