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. 2017 Jun 1;7:2610. doi: 10.1038/s41598-017-02862-2

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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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Transgenic HBV maps. Panel (A) Map of the “front” transgenic HBV, where the foreign gene is inserted within the first R region. Sequence numbering is from the traditional EcoR1 digestion site in the hepatitis B genome. Panel (B). Map of the “back” transgenic HBV, where the foreign gene is inserted within the first R region.