Influenza A viral PB2, PB1, and PA segment conservation plots in human, avian, and swine strains. The name of each segment is shown horizontally and name of host shown vertically. The figures were generated with the PLOTCONS tool from the EMBOSS package. Insights into different host evolution and conservation in the different segments can be inferred from the figure. The plots show that swine strains are the most variable.
ElHefnawi et al. Virology Journal 2011 8:44 doi:10.1186/1743-422X-8-44