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. 2019 Jul 31;9:11135. doi: 10.1038/s41598-019-47226-0

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© The Author(s) 2019

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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Literature statistics for the present study. (a) Barplot indicating the number of studies obtained for each search strategy used in this study. Bars in black represent all literature obtained in each search strategy. Bars in dark grey represent the number of studies specific to Daphnia and gene expression; bars in light grey represent the number of studies from which data was retrievable for analysis. (b) Timeline for studies on gene expression in Daphnia. (c) Barplot showing the number of studies available for different analysis method used in the literature. (d) Pie chart showing the number of studies available for each Daphnia species.