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. 2018 Jul 27;13:22. doi: 10.1186/s12995-018-0205-x

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© The Author(s). 2018

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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Fig. 3 — The representative figure showed that SO₂ inhalation did not affect IgG levels in the serum and nasal septum. a: IgG level in the serum; b: IgG level in the nasal septum; c: IgE level in the serum; d: IgE level in the nasal septum; e: IgA level in the serum; f: IgA level in the nasal septum