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. 2017 Dec 20;7:17923. doi: 10.1038/s41598-017-18054-x

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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 images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Analysis of HA trimer content, thermal and acidic resistances of the TM-replaced recombinant H9N2-TM virus. Western-blot of H9N2-WT and H9N2-TM under non-reducing conditions. (B) Quantification of HA trimer content in H9N2-WT and H9N2-TM. **Indicates p < 0.01. (C) Fusion activity in erythrocytes of H9N2-TM and H9N2-WT at different pH values. *Indicates p < 0.05; **indicates p < 0.01. (D) Thermal resistance of H9N2-WT and H9N2-TM at a temperature ranging from 50 to 62 °C. Error bars represent the standard deviation from triplicate experiments. *Indicates p < 0.05; **indicates p < 0.01. (E) Acidic resistance of H9N2-WT and H9N2-TM in environments of pH 5.0, 5.2, and 7.4 at 37 °C using indirect immunofluorescene assay (IFA).