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. 2016 May 9;47:53. doi: 10.1186/s13567-016-0337-x

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© Lin et al. 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Alignment of NA stalk region of H3N2 CIV isolates from different areas from 2007 to 2012. The Clustal W method was used for the alignment, and boxed residues represent the NA stalk regions (aa 36–78). The consensus is the most similar avian isolate. Identical residues are indicated by dots, and underline residues denote the insertion in the stalk.