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. 2018 Jan 25;8:1584. doi: 10.1038/s41598-018-20044-6

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© The Author(s) 2018

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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Copy numbers of AOA and AOB amoA genes in sediment and water samples of the Yellow River estuary. (a) The data are presented as the mean ± SE of three independent experiments in each sediment site. (b) Box plots represent the differences in abundance between AOA and AOB amoA gene copies in sediment. (c) The data are presented as the mean ± SE of three independent experiments in each water site. (d) Box plots represent the differences in abundance between AOA and AOB amoA gene copies in water.