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. 2014 Oct 23;11:184. doi: 10.1186/1743-422X-11-184

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© Wu et al.; licensee BioMed Central Ltd. 2014

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. 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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The alignment of HA protein of 4 viruses from different origins. The gene sequence of HA of A/Huizhou/1/2013(H7N9) and A/environment/Guangdong/25/2013 (H7N9) was sequenced by GDCDC. The gene sequence of HA of A/chicken/Jiangsu/SC537/2013 (H7N9) [GenBank:CY146940.1] and A/chicken/SD641/Guangdong/2013 [GenBank:CY146908.1] were retrieved from GenBank. The similarity of the nucleotide sequence was 99.5-99.8% to the HA gene and there are 3 different amino acids sites of R65K, T140A and N285D of the HA protein among the 4 viruses.