Figure 2.

Comparison of the NA 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 conserved peptide studied by Gravel et al. [51] is underlined, and amino acid residues considered to be involved in the enzymatic activity [52] are shaded.

Terajima et al. Virology Journal 2013 10:244   doi:10.1186/1743-422X-10-244
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