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. 2010 Oct;16(10):1587–1590. doi: 10.3201/eid1610.100665

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Figure A1 — Phylogenetic trees of A) hemagglutinin (HA) and B) neuramindase (NA) genes of swine influenza viruses, Thailand. Red symbols indicate viruses isolated in this study. Scale bars indicate nucleotide substitutions per site.