Comparison of the HA protein amino acid sequences among influenza A and B viruses. Multiple alignment was performed by CLUSTALW (available at http://www.genome.jp/tools/clustalw/ webcite). Protein accession numbers are shown in brackets next to influenza virus strain names. The fusion peptide is underlined . B cell and CD4+ T cell epitopes are also shown.
Terajima et al. Virology Journal 2013 10:244 doi:10.1186/1743-422X-10-244